[FFmpeg-devel] [PATCH] Add support for private PES streams in mpegts and support for application decoding the stream

Sebastian Cabot scabot
Sun May 31 08:32:32 CEST 2009

On Sun, May 31, 2009 at 7:05 AM, Baptiste Coudurier
<baptiste.coudurier at gmail.com> wrote:
> Sebastian, can you please tell us what do you need to be able to handle
> these streams outside libavformat ?

Yes. No problem.

We have private streams in mpegts of type private_stream_2. I need to
get the data with in.

At first I wrote a special codec as part of libavcodec and inside the
TS muxer started dealing with all the stream types separately.

It occured to me that this is bad practice. Also having to recompile
and link all the library when a change was made is not great. Further
more since ffmpeg is LGPL it would be best not to keep private code as
part of the main library code.

I didn't want to change mpegts muxer to return all streams without a
codec Id or type since I didn't know what else that would break. Also
even If I returned all streams then I would not get the stream_type
back since that is only know once the PAT is processed.

So I got to the conclusion that separating the private code into the
user domain would be the best approach.
Since I couldn't find any way of dynamically loading codecs and there
is no support for that in the ts demuxer I just chose the simplest

So I don't know what all this codec tagging is or how probe will help
me unless of course I write my own codec. How ever I saw that at least
in the ts demuxer only video is probed. Is this so?


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