MP4 library for embedded?

[kidjan]

I was wondering if anyone knew of any open source or commercial MP4 libraries that could be ported to an ARM core. Specifically, my requirements are:

1. Need to be able to write H.264 and some as-of-yet unknown audio format.
2. Need robust metadata support.
3. Need a muxer; demux isn't necessarily required, but would be nice.

I know ffmpeg has MP4 stuff, but I'd really like to get something smaller and less daunting. There's the bento4 library. surprisingly, I have yet to find any realistic commercial offerings.

Another option is for me to just get the ISO spec and bang out something. Thoughts on this option?

Any advice/comments are greatly appreciated--thanks!

[Ritsuka]

I think mp4v2 (http://code.google.com/p/mp4v2/) is what you want. It should be easy to compile it on arm, and it support all the itunes metadata. It also quite easy to add a new audio/video format.

[Dark Shikari]

libavformat itself is not very large; nobody says you have to use all of ffmpeg, and you can disable all muxers/demuxers that aren't relevant.

There's also gpac.

(I'm not clear by what you mean by "write H.264"; do you mean encode it or mux it?)

[kidjan]

libavformat itself is not very large; nobody says you have to use all of ffmpeg, and you can disable all muxers/demuxers that aren't relevant.

There's also gpac.

(I'm not clear by what you mean by "write H.264"; do you mean encode it or mux it?)

Sorry, I should have been more clear: I mean mux it. My embedded system has a hardware-based H.264 encoder that spits out an elementary stream. Eventually there will also be audio, but we're still working on what type of encoding we're going to use.

[kidjan]

I think mp4v2 (http://code.google.com/p/mp4v2/) is what you want. It should be easy to compile it on arm, and it support all the itunes metadata. It also quite easy to add a new audio/video format.

Thank you for the pointer; it looks promising. I'll evaluate the code today.

Also, it looks like the audio codec is going to be AAC or MP3 (we really wanted to go with speex....but....some problems there); and from what I can see, it'll be AAC due to licensing costs.

[kidjan]

MP4v2 was the kicker--about 1.2 MB compiled to the ARM, full featured, pretty easy to use. Nice metadata support, although it was a little unclear whether or not it was using unicode (it was). There are a few fairly minor internationalization problems, but all in all, it's perfect.