Throw when inferred sample MIME type is not supported by the muxer.

This is better than silently dropping tracks as done previously. Later,
we will implement fallback to transcoding to a supported MIME type.

PiperOrigin-RevId: 418006258

libraries/test_data/src/test/assets/transformerdumps/amr/sample_nb.amr.aac.dump

+containerMimeType = video/mp4
+format 0:
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 8000
+  pcmEncoding = 2
+sample:
+  trackIndex = 0
+  dataHashCode = 924517484
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 0
+sample:
+  trackIndex = 0
+  dataHashCode = -835666085
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 813
+sample:
+  trackIndex = 0
+  dataHashCode = 430283125
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 1625
+sample:
+  trackIndex = 0
+  dataHashCode = 1215919932
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 2438
+sample:
+  trackIndex = 0
+  dataHashCode = -386387943
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 3250
+sample:
+  trackIndex = 0
+  dataHashCode = -765080119
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 4063
+sample:
+  trackIndex = 0
+  dataHashCode = -1855636054
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 4875
+sample:
+  trackIndex = 0
+  dataHashCode = -946579722
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 5688
+sample:
+  trackIndex = 0
+  dataHashCode = -841202654
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 6500
+sample:
+  trackIndex = 0
+  dataHashCode = -638764303
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 7313
+sample:
+  trackIndex = 0
+  dataHashCode = -1162388941
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 8125
+sample:
+  trackIndex = 0
+  dataHashCode = 572634367
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 8938
+sample:
+  trackIndex = 0
+  dataHashCode = -1774188021
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 9750
+sample:
+  trackIndex = 0
+  dataHashCode = 92464891
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 10563
+sample:
+  trackIndex = 0
+  dataHashCode = -991397659
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 11375
+sample:
+  trackIndex = 0
+  dataHashCode = -934698563
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 12188
+sample:
+  trackIndex = 0
+  dataHashCode = -811030035
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 13000
+sample:
+  trackIndex = 0
+  dataHashCode = 1892305159
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 13813
+sample:
+  trackIndex = 0
+  dataHashCode = -1266858924
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 14625
+sample:
+  trackIndex = 0
+  dataHashCode = 673814721
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 15438
+sample:
+  trackIndex = 0
+  dataHashCode = 1061124709
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 16250
+sample:
+  trackIndex = 0
+  dataHashCode = -869356712
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 17063
+sample:
+  trackIndex = 0
+  dataHashCode = 664729362
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 17875
+sample:
+  trackIndex = 0
+  dataHashCode = -1439741143
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 18688
+sample:
+  trackIndex = 0
+  dataHashCode = -151627580
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 19500
+sample:
+  trackIndex = 0
+  dataHashCode = -673268457
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 20313
+sample:
+  trackIndex = 0
+  dataHashCode = 1839962647
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 21125
+sample:
+  trackIndex = 0
+  dataHashCode = 1858999665
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 21938
+sample:
+  trackIndex = 0
+  dataHashCode = -1278193537
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 22750
+sample:
+  trackIndex = 0
+  dataHashCode = 568547001
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 23563
+sample:
+  trackIndex = 0
+  dataHashCode = 68217362
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 24375
+sample:
+  trackIndex = 0
+  dataHashCode = 1396217256
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 25188
+sample:
+  trackIndex = 0
+  dataHashCode = -971293094
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 26000
+sample:
+  trackIndex = 0
+  dataHashCode = -1742638874
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 26813
+sample:
+  trackIndex = 0
+  dataHashCode = 2047109317
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 27625
+sample:
+  trackIndex = 0
+  dataHashCode = -1668945241
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 28438
+sample:
+  trackIndex = 0
+  dataHashCode = -1229766218
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 29250
+sample:
+  trackIndex = 0
+  dataHashCode = 1765233454
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 30063
+sample:
+  trackIndex = 0
+  dataHashCode = -1930255456
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 30875
+sample:
+  trackIndex = 0
+  dataHashCode = -764925242
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 31688
+sample:
+  trackIndex = 0
+  dataHashCode = -1144688369
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 32500
+sample:
+  trackIndex = 0
+  dataHashCode = 1493699436
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 33313
+sample:
+  trackIndex = 0
+  dataHashCode = -468614511
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 34125
+sample:
+  trackIndex = 0
+  dataHashCode = -1578782058
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 34938
+sample:
+  trackIndex = 0
+  dataHashCode = -675743397
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 35750
+sample:
+  trackIndex = 0
+  dataHashCode = -863790111
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 36563
+sample:
+  trackIndex = 0
+  dataHashCode = -732307506
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 37375
+sample:
+  trackIndex = 0
+  dataHashCode = -693298708
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 38188
+sample:
+  trackIndex = 0
+  dataHashCode = -799131843
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 39000
+sample:
+  trackIndex = 0
+  dataHashCode = 1782866119
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 39813
+sample:
+  trackIndex = 0
+  dataHashCode = -912205505
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 40625
+sample:
+  trackIndex = 0
+  dataHashCode = 1067981287
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 41438
+sample:
+  trackIndex = 0
+  dataHashCode = 490520060
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 42250
+sample:
+  trackIndex = 0
+  dataHashCode = -1950632957
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 43063
+sample:
+  trackIndex = 0
+  dataHashCode = 565485817
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 43875
+sample:
+  trackIndex = 0
+  dataHashCode = -1057414703
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 44688
+sample:
+  trackIndex = 0
+  dataHashCode = 1568746155
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 45500
+sample:
+  trackIndex = 0
+  dataHashCode = 1355412472
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 46313
+sample:
+  trackIndex = 0
+  dataHashCode = 1546368465
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 47125
+sample:
+  trackIndex = 0
+  dataHashCode = 1811529381
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 47938
+sample:
+  trackIndex = 0
+  dataHashCode = 658031078
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 48750
+sample:
+  trackIndex = 0
+  dataHashCode = 1606584486
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 49563
+sample:
+  trackIndex = 0
+  dataHashCode = 2123252778
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 50375
+sample:
+  trackIndex = 0
+  dataHashCode = -1364579398
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 51188
+sample:
+  trackIndex = 0
+  dataHashCode = 1311427887
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 52000
+sample:
+  trackIndex = 0
+  dataHashCode = -691467569
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 52813
+sample:
+  trackIndex = 0
+  dataHashCode = 1876470084
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 53625
+sample:
+  trackIndex = 0
+  dataHashCode = -1472873479
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 54438
+sample:
+  trackIndex = 0
+  dataHashCode = -143574992
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 55250
+sample:
+  trackIndex = 0
+  dataHashCode = 984180453
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 56063
+sample:
+  trackIndex = 0
+  dataHashCode = -113645527
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 56875
+sample:
+  trackIndex = 0
+  dataHashCode = 1987501641
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 57688
+sample:
+  trackIndex = 0
+  dataHashCode = -1816426230
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 58500
+sample:
+  trackIndex = 0
+  dataHashCode = -1250050360
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 59313
+sample:
+  trackIndex = 0
+  dataHashCode = 1722852790
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 60125
+sample:
+  trackIndex = 0
+  dataHashCode = 225656333
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 60938
+sample:
+  trackIndex = 0
+  dataHashCode = -2137778394
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 61750
+sample:
+  trackIndex = 0
+  dataHashCode = 1433327155
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 62563
+sample:
+  trackIndex = 0
+  dataHashCode = -974261023
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 63375
+sample:
+  trackIndex = 0
+  dataHashCode = 1797813317
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 64188
+sample:
+  trackIndex = 0
+  dataHashCode = -594033497
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 65000
+sample:
+  trackIndex = 0
+  dataHashCode = -628310540
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 65813
+sample:
+  trackIndex = 0
+  dataHashCode = 1868627831
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 66625
+sample:
+  trackIndex = 0
+  dataHashCode = 1051863958
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 67438
+sample:
+  trackIndex = 0
+  dataHashCode = -1279059211
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 68250
+sample:
+  trackIndex = 0
+  dataHashCode = 408201874
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 69063
+sample:
+  trackIndex = 0
+  dataHashCode = 1686644299
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 69875
+sample:
+  trackIndex = 0
+  dataHashCode = 1288226241
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 70688
+sample:
+  trackIndex = 0
+  dataHashCode = 432829731
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 71500
+sample:
+  trackIndex = 0
+  dataHashCode = -1679312600
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 72313
+sample:
+  trackIndex = 0
+  dataHashCode = 1206680829
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 73125
+sample:
+  trackIndex = 0
+  dataHashCode = -325844704
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 73938
+sample:
+  trackIndex = 0
+  dataHashCode = 1941808848
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 74750
+sample:
+  trackIndex = 0
+  dataHashCode = -87346412
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 75563
+sample:
+  trackIndex = 0
+  dataHashCode = -329133765
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 76375
+sample:
+  trackIndex = 0
+  dataHashCode = -1299416212
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 77188
+sample:
+  trackIndex = 0
+  dataHashCode = -1314599219
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 78000
+sample:
+  trackIndex = 0
+  dataHashCode = 1456741286
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 78813
+sample:
+  trackIndex = 0
+  dataHashCode = 151296500
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 79625
+sample:
+  trackIndex = 0
+  dataHashCode = 1708763603
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 80438
+sample:
+  trackIndex = 0
+  dataHashCode = 227542220
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 81250
+sample:
+  trackIndex = 0
+  dataHashCode = 1094305517
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 82063
+sample:
+  trackIndex = 0
+  dataHashCode = -990377604
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 82875
+sample:
+  trackIndex = 0
+  dataHashCode = -1798036230
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 83688
+sample:
+  trackIndex = 0
+  dataHashCode = -1027148291
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 84500
+sample:
+  trackIndex = 0
+  dataHashCode = 359763976
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 85313
+sample:
+  trackIndex = 0
+  dataHashCode = 1332016420
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 86125
+sample:
+  trackIndex = 0
+  dataHashCode = -102753250
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 86938
+sample:
+  trackIndex = 0
+  dataHashCode = 1959063156
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 87750
+sample:
+  trackIndex = 0
+  dataHashCode = 2129089853
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 88563
+sample:
+  trackIndex = 0
+  dataHashCode = 1658742073
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 89375
+sample:
+  trackIndex = 0
+  dataHashCode = 2136916514
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 90188
+sample:
+  trackIndex = 0
+  dataHashCode = 105121407
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 91000
+sample:
+  trackIndex = 0
+  dataHashCode = -839464484
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 91813
+sample:
+  trackIndex = 0
+  dataHashCode = -1956791168
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 92625
+sample:
+  trackIndex = 0
+  dataHashCode = -1387546109
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 93438
+sample:
+  trackIndex = 0
+  dataHashCode = 128410432
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 94250
+sample:
+  trackIndex = 0
+  dataHashCode = 907081136
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 95063
+sample:
+  trackIndex = 0
+  dataHashCode = 1124845067
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 95875
+sample:
+  trackIndex = 0
+  dataHashCode = -1714479962
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 96688
+sample:
+  trackIndex = 0
+  dataHashCode = 322029323
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 97500
+sample:
+  trackIndex = 0
+  dataHashCode = -1116281187
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 98313
+sample:
+  trackIndex = 0
+  dataHashCode = 1571181228
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 99125
+sample:
+  trackIndex = 0
+  dataHashCode = 997979854
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 99938
+sample:
+  trackIndex = 0
+  dataHashCode = -1413492413
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 100750
+sample:
+  trackIndex = 0
+  dataHashCode = -381390490
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 101563
+sample:
+  trackIndex = 0
+  dataHashCode = -331348340
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 102375
+sample:
+  trackIndex = 0
+  dataHashCode = -1568238592
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 103188
+sample:
+  trackIndex = 0
+  dataHashCode = -941591445
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 104000
+sample:
+  trackIndex = 0
+  dataHashCode = 1616911281
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 104813
+sample:
+  trackIndex = 0
+  dataHashCode = -1755664741
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 105625
+sample:
+  trackIndex = 0
+  dataHashCode = -1950609742
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 106438
+sample:
+  trackIndex = 0
+  dataHashCode = 1476082149
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 107250
+sample:
+  trackIndex = 0
+  dataHashCode = 1289547483
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 108063
+sample:
+  trackIndex = 0
+  dataHashCode = -367599018
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 108875
+sample:
+  trackIndex = 0
+  dataHashCode = 679378334
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 109688
+sample:
+  trackIndex = 0
+  dataHashCode = 1437306809
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 110500
+sample:
+  trackIndex = 0
+  dataHashCode = 311988463
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 111313
+sample:
+  trackIndex = 0
+  dataHashCode = -1870442665
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 112125
+sample:
+  trackIndex = 0
+  dataHashCode = 1530013920
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 112938
+sample:
+  trackIndex = 0
+  dataHashCode = -585506443
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 113750
+sample:
+  trackIndex = 0
+  dataHashCode = -293690558
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 114563
+sample:
+  trackIndex = 0
+  dataHashCode = -616893325
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 115375
+sample:
+  trackIndex = 0
+  dataHashCode = 632210495
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 116188
+sample:
+  trackIndex = 0
+  dataHashCode = -291767937
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 117000
+sample:
+  trackIndex = 0
+  dataHashCode = -270265
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 117813
+sample:
+  trackIndex = 0
+  dataHashCode = -1095959376
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 118625
+sample:
+  trackIndex = 0
+  dataHashCode = -1363867284
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 119438
+sample:
+  trackIndex = 0
+  dataHashCode = 185415707
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 120250
+sample:
+  trackIndex = 0
+  dataHashCode = 1033720098
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 121063
+sample:
+  trackIndex = 0
+  dataHashCode = 1813896085
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 121875
+sample:
+  trackIndex = 0
+  dataHashCode = -1381192241
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 122688
+sample:
+  trackIndex = 0
+  dataHashCode = 362689054
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 123500
+sample:
+  trackIndex = 0
+  dataHashCode = -1320787356
+  size = 13
+  isKeyFrame = true
+  presentationTimeUs = 124313
+sample:
+  trackIndex = 0
+  dataHashCode = 1306489379
+  size = 13
+  isKeyFrame = true
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+sample:
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+  presentationTimeUs = 137313
+sample:
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+  size = 13
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+released = true

libraries/test_data/src/test/assets/transformerdumps/mkv/sample_with_srt.mkv.dump

 containerMimeType = video/mp4
 format 0:
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 44100
+  pcmEncoding = 2
+format 1:
   id = 1
   sampleMimeType = video/avc
   codecs = avc1.640034
@@ -11,181 +16,355 @@ format 0:
     data = length 30, hash F6F3D010
     data = length 10, hash 7A0D0F2B
 sample:
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+  trackIndex = 1
   dataHashCode = -252482306
   size = 36477
   isKeyFrame = true
   presentationTimeUs = 0
 sample:
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   size = 5341
   isKeyFrame = false
   presentationTimeUs = 67000
 sample:
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   size = 596
   isKeyFrame = false
   presentationTimeUs = 33000
 sample:
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   size = 7704
   isKeyFrame = false
   presentationTimeUs = 200000
 sample:
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   size = 989
   isKeyFrame = false
   presentationTimeUs = 133000
 sample:
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+  trackIndex = 1
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   size = 721
   isKeyFrame = false
   presentationTimeUs = 100000
 sample:
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   size = 519
   isKeyFrame = false
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 sample:
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   size = 6160
   isKeyFrame = false
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 sample:
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   isKeyFrame = false
   presentationTimeUs = 267000
 sample:
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   isKeyFrame = false
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 sample:
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   isKeyFrame = false
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 sample:
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   isKeyFrame = false
   presentationTimeUs = 433000
 sample:
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   isKeyFrame = false
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 sample:
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   isKeyFrame = false
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 sample:
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   size = 5525
   isKeyFrame = false
   presentationTimeUs = 567000
 sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+sample:
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+  isKeyFrame = true
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+sample:
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   size = 1082
   isKeyFrame = false
   presentationTimeUs = 500000
 sample:
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   size = 807
   isKeyFrame = false
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 sample:
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   size = 744
   isKeyFrame = false
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 sample:
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 sample:
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   size = 1004
   isKeyFrame = false
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 sample:
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   size = 794
   isKeyFrame = false
   presentationTimeUs = 600000
 sample:
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   size = 645
   isKeyFrame = false
   presentationTimeUs = 667000
 sample:
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   size = 2684
   isKeyFrame = false
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 sample:
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   size = 787
   isKeyFrame = false
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 sample:
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+  trackIndex = 1
   dataHashCode = 1544917830
   size = 649
   isKeyFrame = false
   presentationTimeUs = 733000
 sample:
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   dataHashCode = -116205995
   size = 509
   isKeyFrame = false
   presentationTimeUs = 800000
 sample:
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   dataHashCode = 696343585
   size = 1226
   isKeyFrame = false
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 sample:
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   size = 898
   isKeyFrame = false
   presentationTimeUs = 900000
 sample:
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   size = 476
   isKeyFrame = false
   presentationTimeUs = 867000
 sample:
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   dataHashCode = -571265861
   size = 486
   isKeyFrame = false

libraries/test_data/src/test/assets/transformerdumps/mp4/sample_18byte_nclx_colr.mp4.dump

+containerMimeType = video/mp4
+format 0:
+  id = 1
+  sampleMimeType = video/avc
+  codecs = avc1.64001F
+  maxInputSize = 36722
+  width = 1080
+  height = 720
+  frameRate = 29.970028
+  colorInfo:
+    colorSpace = 1
+    colorRange = 2
+    colorTransfer = 3
+    hdrStaticInfo = length 0, hash 0
+  initializationData:
+    data = length 29, hash 4746B5D9
+    data = length 10, hash 7A0D0F2B
+sample:
+  trackIndex = 0
+  dataHashCode = -770308242
+  size = 36692
+  isKeyFrame = true
+  presentationTimeUs = 0
+sample:
+  trackIndex = 0
+  dataHashCode = -732087136
+  size = 5312
+  isKeyFrame = false
+  presentationTimeUs = 66733
+sample:
+  trackIndex = 0
+  dataHashCode = 468156717
+  size = 599
+  isKeyFrame = false
+  presentationTimeUs = 33366
+sample:
+  trackIndex = 0
+  dataHashCode = 1150349584
+  size = 7735
+  isKeyFrame = false
+  presentationTimeUs = 200200
+sample:
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+  dataHashCode = 1443582006
+  size = 987
+  isKeyFrame = false
+  presentationTimeUs = 133466
+sample:
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+  dataHashCode = -310585145
+  size = 673
+  isKeyFrame = false
+  presentationTimeUs = 100100
+sample:
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+  dataHashCode = 807460688
+  size = 523
+  isKeyFrame = false
+  presentationTimeUs = 166833
+sample:
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+  size = 6061
+  isKeyFrame = false
+  presentationTimeUs = 333666
+sample:
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+  size = 992
+  isKeyFrame = false
+  presentationTimeUs = 266933
+sample:
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+  size = 623
+  isKeyFrame = false
+  presentationTimeUs = 233566
+sample:
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+  size = 421
+  isKeyFrame = false
+  presentationTimeUs = 300300
+sample:
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+  dataHashCode = -147880287
+  size = 4899
+  isKeyFrame = false
+  presentationTimeUs = 433766
+sample:
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+sample:
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+sample:
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+  size = 5450
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+sample:
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+  size = 1051
+  isKeyFrame = false
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+sample:
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+  size = 874
+  isKeyFrame = false
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+sample:
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+sample:
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+sample:
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+sample:
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+  dataHashCode = 498370894
+  size = 505
+  isKeyFrame = false
+  presentationTimeUs = 800800
+sample:
+  trackIndex = 0
+  dataHashCode = -1051506468
+  size = 1268
+  isKeyFrame = false
+  presentationTimeUs = 967633
+sample:
+  trackIndex = 0
+  dataHashCode = -1025604144
+  size = 880
+  isKeyFrame = false
+  presentationTimeUs = 900900
+sample:
+  trackIndex = 0
+  dataHashCode = -913586520
+  size = 530
+  isKeyFrame = false
+  presentationTimeUs = 867533
+sample:
+  trackIndex = 0
+  dataHashCode = 1340459242
+  size = 568
+  isKeyFrame = false
+  presentationTimeUs = 934266
+released = true

libraries/transformer/src/main/java/androidx/media3/transformer/TransformationException.java

@@ -161,6 +161,16 @@ public final class TransformationException extends Exception {
   /** Caused by an audio processor initialization failure. */
   public static final int ERROR_CODE_AUDIO_PROCESSOR_INIT_FAILED = 6001;
 
+  // Muxing errors (7xxx).
+
+  /**
+   * Caused by an output sample MIME type inferred from the input not being supported by the muxer.
+   *
+   * <p>Use {@link TransformationRequest.Builder#setAudioMimeType(String)} or {@link
+   * TransformationRequest.Builder#setVideoMimeType(String)} to transcode to a supported MIME type.
+   */
+  public static final int ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED = 7001;
+
   private static final ImmutableBiMap<String, @ErrorCode Integer> NAME_TO_ERROR_CODE =
       new ImmutableBiMap.Builder<String, @ErrorCode Integer>()
           .put("ERROR_CODE_FAILED_RUNTIME_CHECK", ERROR_CODE_FAILED_RUNTIME_CHECK)
@@ -182,6 +192,9 @@ public final class TransformationException extends Exception {
           .put("ERROR_CODE_GL_INIT_FAILED", ERROR_CODE_GL_INIT_FAILED)
           .put("ERROR_CODE_GL_PROCESSING_FAILED", ERROR_CODE_GL_PROCESSING_FAILED)
           .put("ERROR_CODE_AUDIO_PROCESSOR_INIT_FAILED", ERROR_CODE_AUDIO_PROCESSOR_INIT_FAILED)
+          .put(
+              "ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED",
+              ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED)
           .buildOrThrow();
 
   /** Returns the {@code errorCode} for a given name. */
@@ -233,6 +246,17 @@ public final class TransformationException extends Exception {
   }
 
   /**
+   * Creates an instance for a muxer related exception.
+   *
+   * @param cause The cause of the failure.
+   * @param errorCode See {@link #errorCode}.
+   * @return The created instance.
+   */
+  /* package */ static TransformationException createForMuxer(Throwable cause, int errorCode) {
+    return new TransformationException("Muxer error", cause, errorCode);
+  }
+
+  /**
    * Creates an instance for an unexpected exception.
    *
    * <p>If the exception is a runtime exception, error code {@link #ERROR_CODE_FAILED_RUNTIME_CHECK}

libraries/transformer/src/main/java/androidx/media3/transformer/Transformer.java

@@ -808,13 +808,9 @@ public final class Transformer {
     @Override
     public void onTracksInfoChanged(TracksInfo tracksInfo) {
       if (muxerWrapper.getTrackCount() == 0) {
-        // TODO(b/209469847): Do not silently drop unsupported tracks and throw a more specific
-        // exception earlier.
         handleTransformationEnded(
             TransformationException.createForUnexpected(
-                new IllegalStateException(
-                    "The output does not contain any tracks. Check that at least one of the input"
-                        + " sample formats is supported.")));
+                new IllegalStateException("The output does not contain any tracks.")));
       }
     }
 

libraries/transformer/src/main/java/androidx/media3/transformer/TransformerBaseRenderer.java

@@ -16,6 +16,7 @@
 
 package androidx.media3.transformer;
 
+import static androidx.media3.common.util.Assertions.checkState;
 import static androidx.media3.common.util.Assertions.checkStateNotNull;
 
 import androidx.annotation.Nullable;
@@ -57,26 +58,46 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     this.transformationRequest = transformationRequest;
   }
 
+  /**
+   * Returns whether the renderer supports the track type of the given input format.
+   *
+   * @param inputFormat The input format.
+   * @return The {@link Capabilities} for this format.
+   * @throws ExoPlaybackException If the muxer does not support the output sample MIME type derived
+   *     from the input {@code format} and {@link TransformationRequest}.
+   */
   @Override
-  @C.FormatSupport
-  public final int supportsFormat(Format format) {
-    @Nullable String sampleMimeType = format.sampleMimeType;
-    if (MimeTypes.getTrackType(sampleMimeType) != getTrackType()) {
+  @Capabilities
+  public final int supportsFormat(Format inputFormat) throws ExoPlaybackException {
+    @Nullable String inputSampleMimeType = inputFormat.sampleMimeType;
+    if (inputSampleMimeType == null
+        || MimeTypes.getTrackType(inputSampleMimeType) != getTrackType()) {
       return RendererCapabilities.create(C.FORMAT_UNSUPPORTED_TYPE);
-    } else if ((MimeTypes.isAudio(sampleMimeType)
-            && muxerWrapper.supportsSampleMimeType(
-                transformationRequest.audioMimeType == null
-                    ? sampleMimeType
-                    : transformationRequest.audioMimeType))
-        || (MimeTypes.isVideo(sampleMimeType)
-            && muxerWrapper.supportsSampleMimeType(
-                transformationRequest.videoMimeType == null
-                    ? sampleMimeType
-                    : transformationRequest.videoMimeType))) {
+    }
+
+    // If the output sample MIME type is given in the transformationRequest it has already been
+    // validated by the builder.
+    if (MimeTypes.isAudio(inputSampleMimeType) && transformationRequest.audioMimeType != null) {
+      checkState(muxerWrapper.supportsSampleMimeType(transformationRequest.audioMimeType));
+      return RendererCapabilities.create(C.FORMAT_HANDLED);
+    }
+    if (MimeTypes.isVideo(inputSampleMimeType) && transformationRequest.videoMimeType != null) {
+      checkState(muxerWrapper.supportsSampleMimeType(transformationRequest.videoMimeType));
       return RendererCapabilities.create(C.FORMAT_HANDLED);
-    } else {
-      return RendererCapabilities.create(C.FORMAT_UNSUPPORTED_SUBTYPE);
     }
+
+    // When the output sample MIME type is not given in the transformationRequest, it is inferred
+    // from the input.
+    if (muxerWrapper.supportsSampleMimeType(inputSampleMimeType)) {
+      return RendererCapabilities.create(C.FORMAT_HANDLED);
+    }
+    throw wrapTransformationException(
+        TransformationException.createForMuxer(
+            new IllegalArgumentException(
+                "The sample MIME inferred from the input is not supported by the muxer. "
+                    + "Input sample MIME type: "
+                    + inputSampleMimeType),
+            TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED));
   }
 
   @Override
@@ -103,16 +124,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
       while (feedMuxerFromPipeline() || samplePipeline.processData() || feedPipelineFromInput()) {}
     } catch (TransformationException e) {
-      // Transformer extracts the TransformationException from this ExoPlaybackException again. This
-      // temporary wrapping is needed due to the dependence on ExoPlayer's BaseRenderer.
-      throw ExoPlaybackException.createForRenderer(
-          e,
-          "Transformer",
-          getIndex(),
-          /* rendererFormat= */ null,
-          C.FORMAT_HANDLED,
-          /* isRecoverable= */ false,
-          PlaybackException.ERROR_CODE_UNSPECIFIED);
+      throw wrapTransformationException(e);
     }
   }
 
@@ -226,4 +238,23 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
         return false;
     }
   }
+
+  /**
+   * Returns an {@link ExoPlaybackException} wrapping the {@link TransformationException}.
+   *
+   * <p>This temporary wrapping is needed due to the dependence on ExoPlayer's BaseRenderer. {@link
+   * Transformer} extracts the {@link TransformationException} from this {@link
+   * ExoPlaybackException} again.
+   */
+  private ExoPlaybackException wrapTransformationException(
+      TransformationException transformationException) {
+    return ExoPlaybackException.createForRenderer(
+        transformationException,
+        "Transformer",
+        getIndex(),
+        /* rendererFormat= */ null,
+        C.FORMAT_HANDLED,
+        /* isRecoverable= */ false,
+        PlaybackException.ERROR_CODE_UNSPECIFIED);
+  }
 }

libraries/transformer/src/test/java/androidx/media3/transformer/TransformerTest.java

@@ -62,12 +62,14 @@ import org.robolectric.shadows.ShadowMediaCodec;
 public final class TransformerTest {
 
   private static final String URI_PREFIX = "asset:///media/";
-  private static final String FILE_VIDEO_ONLY = "mkv/sample.mkv";
-  private static final String FILE_AUDIO_ONLY = "amr/sample_nb.amr";
+  private static final String FILE_VIDEO_ONLY = "mp4/sample_18byte_nclx_colr.mp4";
   private static final String FILE_AUDIO_VIDEO = "mp4/sample.mp4";
   private static final String FILE_WITH_SUBTITLES = "mkv/sample_with_srt.mkv";
   private static final String FILE_WITH_SEF_SLOW_MOTION = "mp4/sample_sef_slow_motion.mp4";
-  private static final String FILE_WITH_ALL_SAMPLE_FORMATS_UNSUPPORTED = "mp4/sample_ac3.mp4";
+  private static final String FILE_AUDIO_UNSUPPORTED_BY_DECODER = "amr/sample_wb.amr";
+  private static final String FILE_AUDIO_UNSUPPORTED_BY_ENCODER = "amr/sample_nb.amr";
+  private static final String FILE_AUDIO_UNSUPPORTED_BY_MUXER = "mp4/sample_ac3.mp4";
+  private static final String FILE_VIDEO_UNSUPPORTED = "vp9/bear-vp9.webm";
   private static final String FILE_UNKNOWN_DURATION = "mp4/sample_fragmented.mp4";
   public static final String DUMP_FILE_OUTPUT_DIRECTORY = "transformerdumps";
   public static final String DUMP_FILE_EXTENSION = "dump";
@@ -94,7 +96,7 @@ public final class TransformerTest {
   }
 
   @Test
-  public void startTransformation_videoOnly_completesSuccessfully() throws Exception {
+  public void startTransformation_videoOnlyPassthrough_completesSuccessfully() throws Exception {
     Transformer transformer =
         new Transformer.Builder(context)
             .setClock(clock)
@@ -109,18 +111,40 @@ public final class TransformerTest {
   }
 
   @Test
-  public void startTransformation_audioOnly_completesSuccessfully() throws Exception {
+  public void startTransformation_audioOnlyPassthrough_completesSuccessfully() throws Exception {
     Transformer transformer =
         new Transformer.Builder(context)
             .setClock(clock)
             .setMuxerFactory(new TestMuxerFactory())
             .build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_ONLY);
+
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_UNSUPPORTED_BY_ENCODER);
 
     transformer.startTransformation(mediaItem, outputPath);
     TransformerTestRunner.runUntilCompleted(transformer);
 
-    DumpFileAsserts.assertOutput(context, testMuxer, getDumpFileName(FILE_AUDIO_ONLY));
+    DumpFileAsserts.assertOutput(
+        context, testMuxer, getDumpFileName(FILE_AUDIO_UNSUPPORTED_BY_ENCODER));
+  }
+
+  @Test
+  public void startTransformation_audioOnlyTranscoding_completesSuccessfully() throws Exception {
+    Transformer transformer =
+        new Transformer.Builder(context)
+            .setClock(clock)
+            .setMuxerFactory(new TestMuxerFactory())
+            .setTransformationRequest(
+                new TransformationRequest.Builder()
+                    .setAudioMimeType(MimeTypes.AUDIO_AAC) // supported by encoder and muxer
+                    .build())
+            .build();
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_UNSUPPORTED_BY_ENCODER);
+
+    transformer.startTransformation(mediaItem, outputPath);
+    TransformerTestRunner.runUntilCompleted(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context, testMuxer, getDumpFileName(FILE_AUDIO_UNSUPPORTED_BY_ENCODER + ".aac"));
   }
 
   @Test
@@ -144,6 +168,8 @@ public final class TransformerTest {
         new Transformer.Builder(context)
             .setClock(clock)
             .setMuxerFactory(new TestMuxerFactory())
+            .setTransformationRequest(
+                new TransformationRequest.Builder().setAudioMimeType(MimeTypes.AUDIO_AAC).build())
             .build();
     MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_WITH_SUBTITLES);
 
@@ -161,7 +187,7 @@ public final class TransformerTest {
             .setClock(clock)
             .setMuxerFactory(new TestMuxerFactory())
             .build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_VIDEO_ONLY);
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_VIDEO);
 
     // Transform first media item.
     transformer.startTransformation(mediaItem, outputPath);
@@ -172,7 +198,7 @@ public final class TransformerTest {
     transformer.startTransformation(mediaItem, outputPath);
     TransformerTestRunner.runUntilCompleted(transformer);
 
-    DumpFileAsserts.assertOutput(context, testMuxer, getDumpFileName(FILE_VIDEO_ONLY));
+    DumpFileAsserts.assertOutput(context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO));
   }
 
   @Test
@@ -246,10 +272,11 @@ public final class TransformerTest {
             .setMuxerFactory(new TestMuxerFactory())
             .setTransformationRequest(
                 new TransformationRequest.Builder()
-                    .setAudioMimeType(MimeTypes.AUDIO_AMR_WB) // unsupported encoder MIME type
+                    .setAudioMimeType(
+                        MimeTypes.AUDIO_AMR_NB) // unsupported by encoder, supported by muxer
                     .build())
             .build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_ONLY);
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_UNSUPPORTED_BY_MUXER);
 
     transformer.startTransformation(mediaItem, outputPath);
     TransformationException exception = TransformerTestRunner.runUntilError(transformer);
@@ -268,10 +295,10 @@ public final class TransformerTest {
             .setMuxerFactory(new TestMuxerFactory())
             .setTransformationRequest(
                 new TransformationRequest.Builder()
-                    .setAudioMimeType(MimeTypes.AUDIO_AAC) // supported encoder MIME type
+                    .setAudioMimeType(MimeTypes.AUDIO_AAC) // supported by encoder and muxer
                     .build())
             .build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_WITH_ALL_SAMPLE_FORMATS_UNSUPPORTED);
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_UNSUPPORTED_BY_DECODER);
 
     transformer.startTransformation(mediaItem, outputPath);
     TransformationException exception = TransformerTestRunner.runUntilError(transformer);
@@ -315,15 +342,41 @@ public final class TransformerTest {
   }
 
   @Test
-  public void startTransformation_withAllSampleFormatsUnsupported_completesWithError()
+  public void startTransformation_withAudioMuxerFormatUnsupported_completesWithError()
       throws Exception {
-    Transformer transformer = new Transformer.Builder(context).setClock(clock).build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_WITH_ALL_SAMPLE_FORMATS_UNSUPPORTED);
+    Transformer transformer =
+        new Transformer.Builder(context)
+            .setClock(clock)
+            .setMuxerFactory(new TestMuxerFactory())
+            .build();
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_UNSUPPORTED_BY_MUXER);
 
     transformer.startTransformation(mediaItem, outputPath);
     TransformationException exception = TransformerTestRunner.runUntilError(transformer);
 
-    assertThat(exception).hasCauseThat().isInstanceOf(IllegalStateException.class);
+    assertThat(exception).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
+    assertThat(exception).hasCauseThat().hasMessageThat().contains("audio");
+    assertThat(exception.errorCode)
+        .isEqualTo(TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED);
+  }
+
+  @Test
+  public void startTransformation_withVideoMuxerFormatUnsupported_completesWithError()
+      throws Exception {
+    Transformer transformer =
+        new Transformer.Builder(context)
+            .setClock(clock)
+            .setMuxerFactory(new TestMuxerFactory())
+            .build();
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_VIDEO_UNSUPPORTED);
+
+    transformer.startTransformation(mediaItem, outputPath);
+    TransformationException exception = TransformerTestRunner.runUntilError(transformer);
+
+    assertThat(exception).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
+    assertThat(exception).hasCauseThat().hasMessageThat().contains("video");
+    assertThat(exception.errorCode)
+        .isEqualTo(TransformationException.ERROR_CODE_MUXER_SAMPLE_MIME_TYPE_UNSUPPORTED);
   }
 
   @Test
@@ -333,7 +386,7 @@ public final class TransformerTest {
             .setClock(clock)
             .setMuxerFactory(new TestMuxerFactory())
             .build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_VIDEO_ONLY);
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_VIDEO);
 
     transformer.startTransformation(mediaItem, outputPath);
     transformer.cancel();
@@ -343,7 +396,7 @@ public final class TransformerTest {
     transformer.startTransformation(mediaItem, outputPath);
     TransformerTestRunner.runUntilCompleted(transformer);
 
-    DumpFileAsserts.assertOutput(context, testMuxer, getDumpFileName(FILE_VIDEO_ONLY));
+    DumpFileAsserts.assertOutput(context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO));
   }
 
   @Test
@@ -357,7 +410,7 @@ public final class TransformerTest {
             .setClock(clock)
             .setMuxerFactory(new TestMuxerFactory())
             .build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_ONLY);
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_VIDEO);
     AtomicReference<Exception> exception = new AtomicReference<>();
     CountDownLatch countDownLatch = new CountDownLatch(1);
 
@@ -376,13 +429,13 @@ public final class TransformerTest {
     countDownLatch.await();
 
     assertThat(exception.get()).isNull();
-    DumpFileAsserts.assertOutput(context, testMuxer, getDumpFileName(FILE_AUDIO_ONLY));
+    DumpFileAsserts.assertOutput(context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO));
   }
 
   @Test
   public void startTransformation_fromWrongThread_throwsError() throws Exception {
     Transformer transformer = new Transformer.Builder(context).setClock(clock).build();
-    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_ONLY);
+    MediaItem mediaItem = MediaItem.fromUri(URI_PREFIX + FILE_AUDIO_VIDEO);
     HandlerThread anotherThread = new HandlerThread("AnotherThread");
     AtomicReference<IllegalStateException> illegalStateException = new AtomicReference<>();
     CountDownLatch countDownLatch = new CountDownLatch(1);
@@ -609,6 +662,7 @@ public final class TransformerTest {
             /* outputBufferSize= */ 10_000,
             /* codec= */ (in, out) -> out.put(in));
     ShadowMediaCodec.addDecoder(MimeTypes.AUDIO_AAC, codecConfig);
+    ShadowMediaCodec.addDecoder(MimeTypes.AUDIO_AC3, codecConfig);
     ShadowMediaCodec.addDecoder(MimeTypes.AUDIO_AMR_NB, codecConfig);
     ShadowMediaCodec.addEncoder(MimeTypes.AUDIO_AAC, codecConfig);
 
@@ -632,8 +686,9 @@ public final class TransformerTest {
                 throw new IllegalArgumentException("Format unsupported");
               }
             });
-    ShadowMediaCodec.addDecoder(MimeTypes.AUDIO_AC3, throwingCodecConfig);
-    ShadowMediaCodec.addEncoder(MimeTypes.AUDIO_AMR_WB, throwingCodecConfig);
+
+    ShadowMediaCodec.addDecoder(MimeTypes.AUDIO_AMR_WB, throwingCodecConfig);
+    ShadowMediaCodec.addEncoder(MimeTypes.AUDIO_AMR_NB, throwingCodecConfig);
     ShadowMediaCodec.addEncoder(MimeTypes.VIDEO_H263, throwingCodecConfig);
   }