Problem muxing an MP4 file (encoded via jcodec) and AAC with MP4Parser

[Ralph Damiano]

I hope someone can point me in the right direction, really would appreciate it.

I have an MP4 file that I generate with jcodec.

I then have an AAC file I generate with Android's MediaCodec.

I want to mux them together into a single file and since I don't want to limit my Android API too high, I'm opting for MP4Parser.

Currently, I'm doing the standard:

H264TrackImpl h264Track = new H264TrackImpl(new FileDataSourceImpl("input.mp4"));
AACTrackImpl aacTrack = new AACTrackImpl(new FileDataSourceImpl("input.aac"));

Movie movie = new Movie(); movie.addTrack(h264Track); movie.addTrack(aacTrack);

Container mp4file = new DefaultMp4Builder().build(movie);

FileOutputStream fileOutputStream = new FileOutputStream(new File("output.mp4"));
FileChannel fc = fileOutputStream.getChannel();
mp4file.writeContainer(fc);
fileOutputStream.close();


However, the app crashes on this line:


H264TrackImpl h264Track = new H264TrackImpl(new FileDataSourceImpl("input.mp4"));


With this as the stack trace:

09-01 18:46:40.611: E/AndroidRuntime(14115): FATAL EXCEPTION: GLThread 1260
09-01 18:46:40.611: E/AndroidRuntime(14115): Process: package.app, PID: 14115
09-01 18:46:40.611: E/AndroidRuntime(14115): java.lang.RuntimeException: Sequence parameter set extension is not yet handled. Needs TLC.
09-01 18:46:40.611: E/AndroidRuntime(14115): at com.googlecode.mp4parser.authoring.tracks.H264TrackImpl.readSamples(H264TrackImpl.java:362)
09-01 18:46:40.611: E/AndroidRuntime(14115): at com.googlecode.mp4parser.authoring.tracks.H264TrackImpl.parse(H264TrackImpl.java:108)
09-01 18:46:40.611: E/AndroidRuntime(14115): at com.googlecode.mp4parser.authoring.tracks.H264TrackImpl.<init>(H264TrackImpl.java:90)
09-01 18:46:40.611: E/AndroidRuntime(14115): at com.googlecode.mp4parser.authoring.tracks.H264TrackImpl.<init>(H264TrackImpl.java:96)
09-01 18:46:40.611: E/AndroidRuntime(14115): at com.googlecode.mp4parser.authoring.tracks.H264TrackImpl.<init>(H264TrackImpl.java:100)
09-01 18:46:40.611: E/AndroidRuntime(14115): at ...

So I'm not really sure what that means? Does jcodec output an MP4 file (which works in all video players btw) that isn't compatible with MP4Parser?

What should I be looking into to fix this?

Appreciate any advice!

[Sebastian Annies]

Hi,

that means that I never had an input files that had a SPS extension. Could you please make this file available so that I can extend the mp4parser to support it?

Thanks!

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[Ralph Damiano]

Ah, interesting.

I don't know much (read: any) about this type of MP4 encoding stuff, would that be a type of thing I can change when encoding an MP4 from jcodec (if you happen to know, that is). Or is that just how that particular library works?

In any case, I've attached a small MP4 generated with jcodec that gives the above error when imported into MP4Parser.

Thanks for the reply, though, really appreciate it.