[Libav-user] [HELP]mpeg-ts video and audio out of sync, convert from flv with avformat

[陈 钢]

Because i need play my videos on iPad, I wrote a nginx module which convert flv  fragment to mpeg-ts fragment.

But there is a problem, as the video plays the video and audio more and more out of sync. 

After 30min, it is out of sync very significant.

I have been working for that several days on this issue.

I need help.

Below is part of my code:

        if(packet.stream_index==video_index){

            if (packet.pts != (u_int)AV_NOPTS_VALUE)
            {
                packet.pts      = av_rescale_q(packet.pts,AV_TIME_BASE_NEW_Q,video_stream->time_base);
            }
            if (packet.dts != (u_int)AV_NOPTS_VALUE)
            {
                packet.dts      = av_rescale_q(packet.dts,AV_TIME_BASE_NEW_Q,video_stream->time_base);
            }

            if(video_bitstream_filters!=NULL)
            {
                ret = write_frame(oc,&packet,video_stream->codec,video_bitstream_filters);
                if (ret < 0)
                {
                    fprintf(stderr, "Error:write_frame[video] error: %d\n", ret);
                }
            }else{

                ret = av_interleaved_write_frame(oc, &packet);
                if (ret < 0)
                {
                    fprintf(stderr, "Error:av_interleaved_write_frame[video] error: %d\n", ret);
                }
            }
        }else if(packet.stream_index==audio_index){

            if (packet.pts != (u_int)AV_NOPTS_VALUE)
            {
                packet.pts      = av_rescale_q(packet.pts,audio_stream->codec->time_base,audio_stream->time_base);
            }
            if (packet.dts != (u_int)AV_NOPTS_VALUE)
                packet.dts      = av_rescale_q(packet.dts,audio_stream->codec->time_base,audio_stream->time_base);
            if (packet.duration > 0)
                packet.duration = av_rescale_q(packet.duration,audio_stream->codec->time_base,audio_stream->time_base);
            ret = av_interleaved_write_frame(oc, &packet);
            if (ret < 0)
            {
                fprintf(stderr, "Error:av_interleaved_write_frame[audio] error: %d\n", ret);
            }
        }