Support and General Use > Audio Playback, Database and Playlists

Files (.mp4) muxed by yamb do not work.

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sirdan:
It took some time to me but i resolved my problem! And probably found bug in mp4 parser...

Firstly, for anyone interested, the best way to get rid of video track from mp4 is to use tool MP4Muxer from http://www.dvbportal.de/projects/mp4muxer/ Do it with care as this tool deletes video track from existing file.
Any optimizations by foobar or mp3tag for incompatible files (eg. created by yamb) didnt work. For them, demultiplex track to .aac and then create (multiplex) .mp4 file again. Of course by mp4muxer.

Regarding bug in RB. If i try to play incompatible mp4 file, then any mp4 will not work. Even good ones. After reset proper muxed mp4's play fine.

Chronon:
Thanks for the info.  We have a UsefulTools page in the wiki.  If you feel this is a useful tool for this purpose you are welcome to add it. 

It sounds like you might be describing a variation of the bug described at http://www.rockbox.org/tracker/task/8664

Lear:
Foobar2000 should do it, if you've configured it to put MP4 tags first (Advanced preferences, Tagging / MP4 / Tag location).

sirdan:
Hmmm.. still foobar's optimizing doesnt work for me somehow.

In this case, MP4Muxer is useful indeed. I would really like to contribute rockbox. But dont know how, and anyway there are only tools for mp3. Strangely, no one thought about mp4. It would require add new entry for this format.
I think i would find time also to translate rbutility to polish, if anyone didnt start it yet. But how? ;) (forgive me that noob question ;) ) I suppose i should register first?

icheyne:
That MP4Muxer tip is superb. I struggled for ages to get Ffmpeg to cleanly rip audio from youtube files but MP4Muxer does it very cleanly.

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