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Old 3rd July 2021, 14:23   #7  |  Link
LoRd_MuldeR
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Quote:
Originally Posted by Nexin View Post
MP4 Inspector looks very interesting, is there a version that works offline, all I'm seeing are online versions.
https://sourceforge.net/projects/mp4-inspector/files/

Quote:
Originally Posted by Nexin View Post
Audio Tag FF only in valid in WAV/AVI which brings back the problem when AVI after virtualdub is then muxed into an mp4 or other container then many softwares don't like the video complain of the audio Tag FF unknown.
It would be the task of the AVI/WAV demuxing (splitting) software/library to recognize the TwoCC 0xFF as AAC stream and then extract the "raw" AAC data from the AVI/WAV container.

Beyond that point, the original TwoCC has no meaning. The "raw" AAC data (e.g. ADTS), once extracted from the AVI/WAV container, has no such thing as TwoCC.

Finally, it would be the task of the MP4 muxing software/library to set up the MP4 file correctly for the AAC stream. Which TwoCC value was stored in the WAV/AVI file, where the "raw" AAC data originally came from, shouldn't matter here, because MP4 has no such thing – the MP4 muxer generally doesn't know the original TwoCC value, nor does it need to. The MP4 muxer does (should) know how to correctly embed an AAC stream into the MP4 container, though.
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Last edited by LoRd_MuldeR; 3rd July 2021 at 22:14.
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