>> MP4Box -aviraw video clip.avi
>> MP4Box -aviraw audio clip.avi
> In my testing I found that while the video file produced by this method
> is valid, the audio file is not.
Interesting. The only pitfall I've encountered when encoding to AAC
with mencoder is that the faac object/mpeg options get defaults
different from those of (standalone) faac itself, producing
problematic audio files.
I think it was the MAIN object type complexity which led to kind of
distorted audio on playback, and the MPEG version flag 2 which could
cause compatibility problems. Don't ask me about details though.
Anyway, when reproducing the faac defaults with mencoder options
# LOW complexity, MPEG 4
-faacopts br=whatever_number:object=2:mpeg=4
I could always encode video/audio simultaneously to AVC/AAC with
mencoder into one avi and demux as described above. Gave me both valid
video and audio files MP4Box was happy with.
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