[FFmpeg-devel] mpeg4 frames decode
Artem Korneev
tema
Tue Aug 14 17:47:45 CEST 2007
Hello.
I have some questions about libavcodec library usage. Is it suitable
place to ask?..
I need to decode mpeg4 stream, incoming from the network. Packets of
incoming stream contains some additional information - timestamp, key
frame sign, frame, encoded by CODEC_ID_MPEG4 and size of the frame.
I try to decode this stream, but I can not to do it yet. There is some
lines of code below:
// -------------------------------------------------------------
data.inCodec = avcodec_find_decoder(CODEC_ID_MPEG4);
data.inCtx = avcodec_alloc_context();
data.inCtx->width = 320;
data.inCtx->height = 240;
data.inCtx->time_base.num = 1;
data.inCtx->time_base.den = 30;
data.inCtx->max_b_frames = 0;
data.inCtx->pix_fmt = PIX_FMT_YUV420P;
if (avcodec_open(data.inCtx, data.inCodec) < 0) {...}
// -------------------------------------------------------------
So, I created codec context and initialize codec. After that I call
avcodec_decode_video, but this procedure returns 0 only. So, none frames
was decoded.
The picture size (320 x 240), codec (CODEC_ID_MPEG4) and pix_fmt I know
from the source code of the program, which sends video stream.
Anybody can help me to solve this problem? Are there any other things
which needs to be initialized? How I can find a root of the problem? Is
there any opportunities to debug this kind of problems with libavcodec?
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