Added support for DX50

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviExtractor.java

@@ -210,13 +210,17 @@ public class AviExtractor implements Extractor {
             if (streamFormat != null) {
               i++;
               if (streamHeader.isVideo()) {
+                final String mimeType = streamHeader.getMimeType();
+                if (mimeType == null) {
+                  Log.w(TAG, "Unknown FourCC: " + toString(streamHeader.getFourCC()));
+                  continue;
+                }
                 final VideoFormat videoFormat = streamFormat.getVideoFormat();
                 final TrackOutput trackOutput = output.track(streamId, C.TRACK_TYPE_VIDEO);
                 final Format.Builder builder = new Format.Builder();
                 builder.setWidth(videoFormat.getWidth());
                 builder.setHeight(videoFormat.getHeight());
                 builder.setFrameRate(streamHeader.getFrameRate());
-                final String mimeType = streamHeader.getMimeType();
                 builder.setSampleMimeType(mimeType);
 //                final StreamDataBox codecBox = (StreamDataBox) peekNext(streamChildren, i, StreamDataBox.STRD);
 //                final List<byte[]> codecData;

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamHeaderBox.java

@@ -31,6 +31,7 @@ public class StreamHeaderBox extends ResidentBox {
     STREAM_MAP.put('3' | ('V' << 8) | ('I' << 16) | ('D' << 24), mimeType);
     STREAM_MAP.put('x' | ('v' << 8) | ('i' << 16) | ('d' << 24), mimeType);
     STREAM_MAP.put('X' | ('V' << 8) | ('I' << 16) | ('D' << 24), mimeType);
+    STREAM_MAP.put('D' | ('X' << 8) | ('5' << 16) | ('0' << 24), mimeType);
 
     STREAM_MAP.put('m' | ('j' << 8) | ('p' << 16) | ('g' << 24), MimeTypes.VIDEO_JPEG);
   }