[Libav-user] Having problem to seek MPEGTS video using av_seek_frame

[zuraq]

I'm trying to use ffmpeg function to capture some thumbnail of video. I'm use
the example of the ffmpeg and write code like this:

    int timeStamp = ((double)ms / (double)1000) *
pFormatCtx->streams[videoStream]->time_base.den /
pFormatCtx->streams[videoStream]->time_base.num;

    int ret = av_seek_frame(pFormatCtx, videoStream, timeStamp,
AVSEEK_FLAG_BACKWARD);

    while (av_read_frame(pFormatCtx, &packet) >= 0) {

        if (packet.stream_index == videoStream) {
            avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,
&packet);

            if (frameFinished) {
                sws_scale(sws_ctx, (uint8_t const * const *) pFrame->data,
pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data,
pFrameRGB->linesize);

                if (++i <= 1) {
                    SaveFrame(pFrameRGB, pCodecCtx->width,
pCodecCtx->height, i);
                }

            }
        }
        av_packet_unref(&packet);
    }

actually,it works well in .mp4 video. but for .ts video, it can only capture
the first frame of the video, I think the problem is av_seek_frame doesnt
work,but I dont know how to fix the problem. can anyone give me some help?



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