Ok, i found solution for other users.
I'm using frame number based on av_read_frame and it's work.
FFmpeg can read a frame and not decode it.
Le 03/14/2009 10:25 AM, [email protected] a écrit :
Hello,
i'm using ffmpeg to decode a video frame and compute a digital signature
(1 frame -> 8 bytes)
When i compare video duration and number of signatures (i.e frames), i
miss some frames (100 frames for 24 hours) so i've a delay with my
results.
I think it's due to some errors in my stream :
[mpeg2video @ 0xb7d8f9d0]concealing 1530 DC, 1530 AC, 1530 MV errors
[mpeg2video @ 0xb7d8f9d0]ac-tex damaged at 37 26=256424.1 bitrate=
How can i detect these frames to keep the right number of frame ?
Thanks for any help.
Sebastien
PS : here is my code :
while (av_read_frame (pFormatCtx,&packet)>= 0) {
if (packet.stream_index == videoStream) {
avcodec_decode_video(pCodecCtx, pFrame,&frameFinished,packet.data,
packet.size);
if (frameFinished) {
sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize, 0,
pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
signature = sig->compute(pFrameYUV->data[0]);
fseek (outputfile, (pCodecCtx->frame_number-1)*8 , SEEK_SET );
fwrite(&signature,8,1,outputfile);
}
}
}
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--
Sébastien Campion
Research Engineer
SED - Service of Experimental plateforms and Development
TEXMEX - Research Team
INRIA Rennes - Campus de Beaulieu
35042 Rennes Cedex - France
http://www.irisa.fr/
phone : +33 2 99 84 75 53 - Fax. +33 2 99 84 71 71
mailto : [email protected]
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title:Research Engineer
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