[Ffmpeg-devel] Three ffserver patches for review

Luca Abeni lucabe72
Fri Apr 20 16:38:58 CEST 2007

Hi Michael,

Michael Niedermayer wrote:
>> 1) I do not know if the libavformat/utils.c modifications are ok (others 
>> will have to comment on this)
> hmm, why doesnt ffserver use AVFormatContext?
Good question :)
I am not sure if I know ffserver enough to have the answer...

Anyway, here is my (maybe wrong) understanding:
ffserver does use AVFormatContext, but in this particular function - 
add_av_stream1() - it wants to create an AVStream independently from any 
AVFormatContext, during the initialization.

This AVStream will be memcpy()ed into a newly created AVFormatContext 
later, in rtp_new_av_stream(), when an RTP connection is created (I 
suppose something similar happens for HTTP too?).
I am not sure why this is done; maybe ffserver wants to prepare a 
"pre-compiled" AVStream in advance, on program startup, to fill the 
AVFormatContext's streams with it for performance reasons?
(BTW, this memcpy() in rtp_new_av_stream() is the thing which was 
causing the crash I fixed with my patch)

Unfortunately, my understanding of ffserver is too limited... :(
If current ffserver code is wrong, can you quickly explain what it 
should do, and I'll try to prepare a patch during the weekend?


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