Use FakeExtractorOutput in Mp4MuxerMetadataTest

The FakeExtractorOutput dumps data in more readable format
so using that where ever possible.

The MdtaMetadataEntry which contains key and value dumped only "key".
Added fix to dump "value" as well.

PiperOrigin-RevId: 517968996

library/extractor/src/main/java/com/google/android/exoplayer2/metadata/mp4/MdtaMetadataEntry.java

@@ -82,7 +82,7 @@ public final class MdtaMetadataEntry implements Metadata.Entry {
 
   @Override
   public String toString() {
-    return "mdta: key=" + key;
+    return "mdta: key=" + key + ", value=" + Util.toHexString(value);
   }
 
   // Parcelable implementation.

library/extractor/src/main/java/com/google/android/exoplayer2/metadata/mp4/Mp4LocationData.java

@@ -59,7 +59,7 @@ public final class Mp4LocationData implements Metadata.Entry {
 
   @Override
   public String toString() {
-    return "xyz: latitude=" + latitude + " longitude=" + longitude;
+    return "xyz: latitude=" + latitude + ", longitude=" + longitude;
   }
 
   // Parcelable implementation.

testdata/src/test/assets/extractordumps/mp4/sample.mp4.0.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1080
     height = 720
     frameRate = 29.970028
-    metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 29, hash 4746B5D9
       data = length 10, hash 7A0D0F2B
@@ -153,7 +153,7 @@ track 1:
     channelCount = 1
     sampleRate = 44100
     language = und
-    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 2, hash 5F7
   sample 0:

testdata/src/test/assets/extractordumps/mp4/sample.mp4.1.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1080
     height = 720
     frameRate = 29.970028
-    metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 29, hash 4746B5D9
       data = length 10, hash 7A0D0F2B
@@ -153,7 +153,7 @@ track 1:
     channelCount = 1
     sampleRate = 44100
     language = und
-    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 2, hash 5F7
   sample 0:

testdata/src/test/assets/extractordumps/mp4/sample.mp4.2.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1080
     height = 720
     frameRate = 29.970028
-    metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 29, hash 4746B5D9
       data = length 10, hash 7A0D0F2B
@@ -153,7 +153,7 @@ track 1:
     channelCount = 1
     sampleRate = 44100
     language = und
-    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 2, hash 5F7
   sample 0:

testdata/src/test/assets/extractordumps/mp4/sample.mp4.3.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1080
     height = 720
     frameRate = 29.970028
-    metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 29, hash 4746B5D9
       data = length 10, hash 7A0D0F2B
@@ -153,7 +153,7 @@ track 1:
     channelCount = 1
     sampleRate = 44100
     language = und
-    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 2, hash 5F7
   sample 0:

testdata/src/test/assets/extractordumps/mp4/sample.mp4.unknown_length.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1080
     height = 720
     frameRate = 29.970028
-    metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 29, hash 4746B5D9
       data = length 10, hash 7A0D0F2B
@@ -153,7 +153,7 @@ track 1:
     channelCount = 1
     sampleRate = 44100
     language = und
-    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+    metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
     initializationData:
       data = length 2, hash 5F7
   sample 0:

testdata/src/test/assets/extractordumps/mp4/sample_android_slow_motion.mp4.0.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1280
     height = 720
     frameRate = 13.307984
-    metadata = entries=[mdta: key=com.android.capture.fps]
+    metadata = entries=[mdta: key=com.android.capture.fps, value=43700000]
     initializationData:
       data = length 22, hash 4CF81805
       data = length 9, hash FBAFBA1C

testdata/src/test/assets/extractordumps/mp4/sample_android_slow_motion.mp4.1.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1280
     height = 720
     frameRate = 13.307984
-    metadata = entries=[mdta: key=com.android.capture.fps]
+    metadata = entries=[mdta: key=com.android.capture.fps, value=43700000]
     initializationData:
       data = length 22, hash 4CF81805
       data = length 9, hash FBAFBA1C

testdata/src/test/assets/extractordumps/mp4/sample_android_slow_motion.mp4.2.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1280
     height = 720
     frameRate = 13.307984
-    metadata = entries=[mdta: key=com.android.capture.fps]
+    metadata = entries=[mdta: key=com.android.capture.fps, value=43700000]
     initializationData:
       data = length 22, hash 4CF81805
       data = length 9, hash FBAFBA1C

testdata/src/test/assets/extractordumps/mp4/sample_android_slow_motion.mp4.3.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1280
     height = 720
     frameRate = 13.307984
-    metadata = entries=[mdta: key=com.android.capture.fps]
+    metadata = entries=[mdta: key=com.android.capture.fps, value=43700000]
     initializationData:
       data = length 22, hash 4CF81805
       data = length 9, hash FBAFBA1C

testdata/src/test/assets/extractordumps/mp4/sample_android_slow_motion.mp4.unknown_length.dump

@@ -17,7 +17,7 @@ track 0:
     width = 1280
     height = 720
     frameRate = 13.307984
-    metadata = entries=[mdta: key=com.android.capture.fps]
+    metadata = entries=[mdta: key=com.android.capture.fps, value=43700000]
     initializationData:
       data = length 22, hash 4CF81805
       data = length 9, hash FBAFBA1C

testdata/src/test/assets/muxerdumps/mp4_with_frame_rate.mp4.dump

-ftyp (28 bytes):
-  Data = length 20, hash EF896440
-mdat (71 bytes):
-  Data = length 55, hash 6B19F4A7
-moov (774 bytes):
-  mvhd (108 bytes):
-    Data = length 100, hash A5ADE288
-  meta (124 bytes):
-    hdlr (33 bytes):
-      Data = length 25, hash C39D0F5B
-    keys (47 bytes):
-      Data = length 39, hash 1747DBD0
-    ilst (36 bytes):
-      Data = length 28, hash 2BFD1C61
-  trak (534 bytes):
-    tkhd (92 bytes):
-      Data = length 84, hash C25E979A
-    mdia (434 bytes):
-      mdhd (32 bytes):
-        Data = length 24, hash 50217AD
-      hdlr (44 bytes):
-        Data = length 36, hash A0852FF2
-      minf (350 bytes):
-        vmhd (20 bytes):
-          Data = length 12, hash EE830681
-        dinf (36 bytes):
-          Data = length 28, hash D535436B
-        stbl (286 bytes):
-          stsd (158 bytes):
-            Data = length 150, hash 2AD095C5
-          stts (24 bytes):
-            Data = length 16, hash E4FC6483
-          stsz (24 bytes):
-            Data = length 16, hash 50B7F5B9
-          stsc (28 bytes):
-            Data = length 20, hash 8F6E8285
-          co64 (24 bytes):
-            Data = length 16, hash E4EE4D2E
-          stss (20 bytes):
-            Data = length 12, hash EE911E03
+seekMap:
+  isSeekable = true
+  duration = 0
+  getPosition(0) = [[timeUs=0, position=44]]
+  getPosition(1) = [[timeUs=0, position=44]]
+  getPosition(0) = [[timeUs=0, position=44]]
+  getPosition(0) = [[timeUs=0, position=44]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 55
+  sample count = 1
+  format 0:
+    id = 1
+    sampleMimeType = video/avc
+    codecs = avc1.9B2BF3
+    maxInputSize = 85
+    width = 12
+    height = 10
+    metadata = entries=[mdta: key=com.android.capture.fps, value=42f00000]
+    initializationData:
+      data = length 24, hash 7F12E259
+      data = length 5, hash 1B4D906
+  sample 0:
+    time = 0
+    flags = 536870913
+    data = length 55, hash A481CEF4
+tracksEnded = true

testdata/src/test/assets/muxerdumps/mp4_with_location.mp4.dump

-ftyp (28 bytes):
-  Data = length 20, hash EF896440
-mdat (71 bytes):
-  Data = length 55, hash 6B19F4A7
-moov (688 bytes):
-  mvhd (108 bytes):
-    Data = length 100, hash A5ADE288
-  udta (38 bytes):
-    Data = length 30, hash 25372BB9
-  trak (534 bytes):
-    tkhd (92 bytes):
-      Data = length 84, hash C25E979A
-    mdia (434 bytes):
-      mdhd (32 bytes):
-        Data = length 24, hash 50217AD
-      hdlr (44 bytes):
-        Data = length 36, hash A0852FF2
-      minf (350 bytes):
-        vmhd (20 bytes):
-          Data = length 12, hash EE830681
-        dinf (36 bytes):
-          Data = length 28, hash D535436B
-        stbl (286 bytes):
-          stsd (158 bytes):
-            Data = length 150, hash 2AD095C5
-          stts (24 bytes):
-            Data = length 16, hash E4FC6483
-          stsz (24 bytes):
-            Data = length 16, hash 50B7F5B9
-          stsc (28 bytes):
-            Data = length 20, hash 8F6E8285
-          co64 (24 bytes):
-            Data = length 16, hash E4EE4D2E
-          stss (20 bytes):
-            Data = length 12, hash EE911E03
+seekMap:
+  isSeekable = true
+  duration = 0
+  getPosition(0) = [[timeUs=0, position=44]]
+  getPosition(1) = [[timeUs=0, position=44]]
+  getPosition(0) = [[timeUs=0, position=44]]
+  getPosition(0) = [[timeUs=0, position=44]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 55
+  sample count = 1
+  format 0:
+    id = 1
+    sampleMimeType = video/avc
+    codecs = avc1.9B2BF3
+    maxInputSize = 85
+    width = 12
+    height = 10
+    metadata = entries=[xyz: latitude=33.0, longitude=-120.0]
+    initializationData:
+      data = length 24, hash 7F12E259
+      data = length 5, hash 1B4D906
+  sample 0:
+    time = 0
+    flags = 536870913
+    data = length 55, hash A481CEF4
+tracksEnded = true

testdata/src/test/assets/muxerdumps/mp4_with_null_location.mp4.dump

-ftyp (28 bytes):
-  Data = length 20, hash EF896440
-mdat (71 bytes):
-  Data = length 55, hash 6B19F4A7
-moov (650 bytes):
-  mvhd (108 bytes):
-    Data = length 100, hash A5ADE288
-  trak (534 bytes):
-    tkhd (92 bytes):
-      Data = length 84, hash C25E979A
-    mdia (434 bytes):
-      mdhd (32 bytes):
-        Data = length 24, hash 50217AD
-      hdlr (44 bytes):
-        Data = length 36, hash A0852FF2
-      minf (350 bytes):
-        vmhd (20 bytes):
-          Data = length 12, hash EE830681
-        dinf (36 bytes):
-          Data = length 28, hash D535436B
-        stbl (286 bytes):
-          stsd (158 bytes):
-            Data = length 150, hash 2AD095C5
-          stts (24 bytes):
-            Data = length 16, hash E4FC6483
-          stsz (24 bytes):
-            Data = length 16, hash 50B7F5B9
-          stsc (28 bytes):
-            Data = length 20, hash 8F6E8285
-          co64 (24 bytes):
-            Data = length 16, hash E4EE4D2E
-          stss (20 bytes):
-            Data = length 12, hash EE911E03
+seekMap:
+  isSeekable = true
+  duration = 0
+  getPosition(0) = [[timeUs=0, position=44]]
+  getPosition(1) = [[timeUs=0, position=44]]
+  getPosition(0) = [[timeUs=0, position=44]]
+  getPosition(0) = [[timeUs=0, position=44]]
+numberOfTracks = 1
+track 0:
+  total output bytes = 55
+  sample count = 1
+  format 0:
+    id = 1
+    sampleMimeType = video/avc
+    codecs = avc1.9B2BF3
+    maxInputSize = 85
+    width = 12
+    height = 10
+    initializationData:
+      data = length 24, hash 7F12E259
+      data = length 5, hash 1B4D906
+  sample 0:
+    time = 0
+    flags = 536870913
+    data = length 55, hash A481CEF4
+tracksEnded = true

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.48000hz.dump

@@ -6,18 +6,18 @@ format 0:
   width = 1080
   height = 720
   frameRate = 29.970028
-  metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 29, hash 4746B5D9
     data = length 10, hash 7A0D0F2B
-metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
 format 1:
   sampleMimeType = audio/mp4a-latm
   channelCount = 1
   sampleRate = 48000
   pcmEncoding = 2
-  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
-metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
+metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
 sample:
   trackIndex = 1
   dataHashCode = 1868041800

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.concatenated.dump

@@ -6,11 +6,11 @@ format 0:
   width = 1080
   height = 720
   frameRate = 29.970028
-  metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 29, hash 4746B5D9
     data = length 10, hash 7A0D0F2B
-metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
 format 1:
   peakBitrate = 200000
   id = 2
@@ -20,10 +20,10 @@ format 1:
   channelCount = 1
   sampleRate = 44100
   language = und
-  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 2, hash 5F7
-metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
 sample:
   trackIndex = 1
   dataHashCode = 1205768497

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.concatenated_with_high_pitch_and_no_video.dump

@@ -3,8 +3,8 @@ format 0:
   channelCount = 1
   sampleRate = 44100
   pcmEncoding = 2
-  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
-metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
+metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
 sample:
   trackIndex = 0
   dataHashCode = 915609509

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.dump

@@ -6,11 +6,11 @@ format 0:
   width = 1080
   height = 720
   frameRate = 29.970028
-  metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 29, hash 4746B5D9
     data = length 10, hash 7A0D0F2B
-metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
 format 1:
   peakBitrate = 200000
   id = 2
@@ -20,10 +20,10 @@ format 1:
   channelCount = 1
   sampleRate = 44100
   language = und
-  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 2, hash 5F7
-metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
 sample:
   trackIndex = 1
   dataHashCode = 1205768497

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.noaudio.dump

@@ -6,11 +6,11 @@ format 0:
   width = 1080
   height = 720
   frameRate = 29.970028
-  metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 29, hash 4746B5D9
     data = length 10, hash 7A0D0F2B
-metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
 sample:
   trackIndex = 0
   dataHashCode = -770308242

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.novideo.dump

@@ -7,10 +7,10 @@ format 0:
   channelCount = 1
   sampleRate = 44100
   language = und
-  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 2, hash 5F7
-metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[TSSE: description=null: values=[Lavf56.1.0], xyz: latitude=40.68, longitude=-74.5]
 sample:
   trackIndex = 0
   dataHashCode = 1205768497

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio.dump

@@ -6,11 +6,11 @@ format 0:
   width = 1080
   height = 720
   frameRate = 29.970028
-  metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 29, hash 4746B5D9
     data = length 10, hash 7A0D0F2B
-metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
 format 1:
   sampleMimeType = audio/mp4a-latm
   channelCount = 2

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio_with_effects.dump

@@ -6,11 +6,11 @@ format 0:
   width = 1080
   height = 720
   frameRate = 29.970028
-  metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 29, hash 4746B5D9
     data = length 10, hash 7A0D0F2B
-metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
 format 1:
   sampleMimeType = audio/mp4a-latm
   channelCount = 2

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.silentaudio.dump

@@ -6,11 +6,11 @@ format 0:
   width = 1080
   height = 720
   frameRate = 29.970028
-  metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+  metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
   initializationData:
     data = length 29, hash 4746B5D9
     data = length 10, hash 7A0D0F2B
-metadata = entries=[xyz: latitude=40.68 longitude=-74.5]
+metadata = entries=[xyz: latitude=40.68, longitude=-74.5]
 format 1:
   sampleMimeType = audio/mp4a-latm
   channelCount = 2

testdata/src/test/assets/transformerdumps/mp4/sample_sef_slow_motion.mp4.dump

@@ -6,11 +6,11 @@ format 0:
   width = 320
   height = 240
   frameRate = 29.523811
-  metadata = entries=[mdta: key=com.android.capture.fps, smta: captureFrameRate=240.0, svcTemporalLayerCount=4, SlowMotion: segments=[Segment: startTimeMs=88, endTimeMs=879, speedDivisor=2, Segment: startTimeMs=1255, endTimeMs=1970, speedDivisor=8]]
+  metadata = entries=[mdta: key=com.android.capture.fps, value=43700000, smta: captureFrameRate=240.0, svcTemporalLayerCount=4, SlowMotion: segments=[Segment: startTimeMs=88, endTimeMs=879, speedDivisor=2, Segment: startTimeMs=1255, endTimeMs=1970, speedDivisor=8]]
   initializationData:
     data = length 33, hash D3FB879D
     data = length 10, hash 7A0D0F2B
-metadata = entries=[mdta: key=com.android.capture.fps, smta: captureFrameRate=240.0, svcTemporalLayerCount=4, SlowMotion: segments=[Segment: startTimeMs=88, endTimeMs=879, speedDivisor=2, Segment: startTimeMs=1255, endTimeMs=1970, speedDivisor=8]]
+metadata = entries=[mdta: key=com.android.capture.fps, value=43700000, smta: captureFrameRate=240.0, svcTemporalLayerCount=4, SlowMotion: segments=[Segment: startTimeMs=88, endTimeMs=879, speedDivisor=2, Segment: startTimeMs=1255, endTimeMs=1970, speedDivisor=8]]
 format 1:
   sampleMimeType = audio/mp4a-latm
   channelCount = 2