[FFmpeg-devel] [PATCH] Add the frame size attribute to SDP descriptions

Luca Abeni lucabe72
Thu Jan 7 16:22:00 CET 2010

Hi Martin,

Martin Storsj? wrote:
> Hi,
> The attached patch adds a=framesize: attributes to generated SDP 
> descriptions, for video codecs.

Is this attribute described somewhere? (even if not in an RFC...
Is it part of some other standard such as ISMA, 3GP, or similar?)

> it seems to be common practice. FFmpeg's H264 rtp parser reads such a 
> line

Such usage is unfortunately wrong (IMHO).

> and QuickTime player also seems to benefit from having it available.

If some client has a sane usage for this attribute, I am ok with the
patch... How does qt player use the "a=framesize:" line?
(I am asking because I want to avoid potential misunderstanding like
the one in rtp_h264.c).


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