Create mp4 with h264 video and mp3 audio

[Roman Elizarov]

Hello. I have raw h264 and mp3 samples. ffmpeg combines them into a playable mp4 container. I'd like to be able to do the same via mp4parser, so that I can do it on the fly in my java code. There is a "H264Example" that works just fine to mux my particular h264 file (after I've converted it to Annex B format). However, I see only AC3 and AAC track implementations for audio. Any chance to get MP3 tracks supported, too? 

[Sebastian Annies]

Hi,

AFAIK there is no specification for MP3 in MP4 containers. Do you know where it is specified? If it is specified I might be able to implement it.

Regards,

Sebastian

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[Roman Elizarov]

I have not seen it. ffmpeg produces it just fine (ffmpeg -i data.h264 -i data.mp3 -vcodec copy -acodec copy data.mp4) where .h264 is Annex B h264 and .mp3 is a raw sequence of 209 byte mp3 frames (no tags, no header, no IDv3). The resulting file plays normally in Windows Media Player, in VLC player, and in JavaFX media. I can inspect it with mp4 inspector -- it works just fine. I can drop source .h264/.mp3 and/or resulting .mp4 files for you.

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[Sebastian Annies]

Yes, please send me input and output. Perhaps I can create an Mp3TrackImpl easily.

[Roman Elizarov]

I've did some extra works and created a sample from the creative commons content, so that you can freely use/distribute it if you want to. It is based on http://www.bigbuckbunny.org/

I'm basically interested in converting h264+MP3 FLV container to mpeg4 in Java, so I've created a BigBuckBunny_320x180_44100.flv with h264 and mp3 of exactly the kind I'm interested in. I have my own FLV demuxer in Java (that's simple) that extracts from it Annex B h264 stream (BigBuckBunny_320x180_44100.flv.h264) and raw mp3 samples stream (BigBuckBunny_320x180_44100.flv.mp3). Then I'm using ffmpeg to mux them into mp4 ("ffmpeg -i BigBuckBunny_320x180_44100.flv.h264 -i BigBuckBunny_320x180_44100.flv.mp3 -acodec copy -vcodec copy BigBuckBunny_320x180_44100.mp4") and the result is "BigBuckBunny_320x180_44100.mp4". mp4inspector happily sees it contents and this .mp4 file plays to my pleause in Windows Media Player, in VLC Player, and in JavaFX Media. Now, the trick is to be able to do the same muxing via mp4parser. I can contribute my simple FLV demuxer code to you codebase, so that you can have FLV to MP4 converter as one of examples in mp4parser library.

To download the files go to https://download.in.devexperts.com/pickup.php?claimID=GMV32qhiD9QTgvht&claimPasscode=4C8WsQcdEHQixwbJ

Sincerely,

Roman Elizarov

[Roman Elizarov]

Sebastian, 

I've already implemented MP3TrackImpl. It works like a charm. There's a small small patch to DecoderConfigDescriptor so that it can serialize itself properly when audioSpecificInfo is null. How can I contribute my code to your library? 

So now I can convert H264+MP3 FLV to fragmented MP4. My next stemp is to be able to do the same trick on-the-fly while receiving live FLV stream and writing live fragmented MP4. This will likely require much more improvements to mp4parser code. It will require some architectural changes in mp4parser code, though. I'll carry them in my local local and see if they can be merged with mp4parser code.

Sincerely,

Roman Elizarov

[Roman Elizarov]

Here is my patch (attached). 

[Sebastian Annies]

Hi Roman,

 

Thank you so much for your code. The code is now in trunk. I assume you are ok with publishing it under Apache License v2?

 

Best Regards,

[Roman Elizarov]

Of course.