[FFmpeg-devel] [PATCH] h264 bitstream filter

Måns Rullgård mans
Wed Sep 5 21:19:31 CEST 2007

Benoit Fouet <benoit.fouet at purplelabs.com> writes:

> M?ns Rullg?rd wrote:
>> Benoit Fouet <benoit.fouet at purplelabs.com> writes:
>>> Michael Niedermayer wrote:
>>>> patch ok if it works
>>>> [...]
>>> i have one remaining question: should mp4 files contain AUD nal units
>>> too or have i missed something (again :) ) ?
>>> if i'm right, it seems that our muxer doesn't handle it, as i don't get
>>> the aud frames...
>>> if i'm wrong, i'll have to add the aud in the filter too.
>> AUD (Access Unit Delimiter) is an optional NAL unit with the sole
>> purpose of marking the start of a new frame (access unit).  There
>> would be no sense in using it in formats like mp4 that signal frame
>> boundaries by other means.
> so, it isn't necessary to add AUD to the "reconstructed" data flow
> neither ?

No, it's entirely optional.

M?ns Rullg?rd
mans at mansr.com

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