[FFmpeg-devel] [PATCH] h264 bitstream filter

[Måns Rullgård]

Benoit Fouet wrote:
> Hi,
>
> here is a patch to convert from avc in mp4 container to elementary stream.
> be fair, this is my first try :-P
>
> things i don't really know:
>  - whether sps and pps have to be written for each elementary stream
> NALU or not

That question doesn't really make sense, SPS and PPS being NAL units of
their own.  I guess what you meant to ask was at which points the SPS and
PPS should be inserted into the stream.  They should be present before
any IDR picture (NAL unit type 5), after any optional AUD or SEI NAL units.

>  - whether bistream filter is fed with NALU or not (that's to say: do we
> have to parse input buffer)

The mp4 container already has the data split as NAL units, so there's
nothing to parse.  In fact, you can't in general find the NAL unit
boundaries in raw RBSP data, hence the need for Annex B format or a
container like mp4 to provide framing.

-- 
M?ns Rullg?rd
mans at mansr.com