[FFmpeg-devel] Encoding video stream into CIF and 25 fps video format

Benoit Fouet benoit.fouet
Fri Oct 5 15:54:22 CEST 2007

Michel Bardiaux wrote:
> Anthony Chapellier a ?crit :
>> Hi,
>> I'm a beginner with video codecs and ffmpeg so I'd appreciate some help.^^
>> I'm doing some devel on a program which encode a video stream provided 
>> by a webcam using h263 codec from libavcodec library. Until today, the 
>> program has been working perfectly fine and encoded the video into QCIF 
>> and 10fps video format.
>> However, I wish to change those settings and encode the video into CIF 
>> and 25 fps video format. And this is my big problem !!! Firstly I'm 
>> unable to get 25 fps, the video stream don't go over 15 fps... 
>> Secondary, when I try to encode the video into CIF I got a lot of error 
>> messages :
>> - rc buffer underflow
>> - concealing xxx DC, xxx AC, xxx MV errors
>> And something weird is that the video quality is really good during a 
>> few seconds and after that it's full of grey pixels.So do you know how I 
>> could solve this problem ? is there some setting I didn't well like 
>> buffer size, bit rate or something else... ?
> We cant do anything without the exact command used and its output messages.

and such questions belong to ffmpeg-user

Purple Labs S.A.

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