该应用程序将摄像机输出保存为mov。文件,然后将其转换为AVPacket发送给rtmp服务器的flv格式。 它每次在两个文件之间切换,一个由摄像机输出写入,另一个发送。 我的问题是,一段时间后音频/视频不同步。FFMpeg iOS应用程序中的音频/视频不同步
发送的第一个缓冲区总是100%同步,但过了一段时间后就会混乱。 我相信它是一个DTS-PTS的问题..
if(isVideo)
{
packet->stream_index = VIDEO_STREAM;
packet->dts = packet->pts = videoPosition;
videoPosition += packet->duration = FLV_TIMEBASE * packet->duration * videoCodec->ticks_per_frame * videoCodec->time_base.num/videoCodec->time_base.den;
}
else
{
packet->stream_index = AUDIO_STREAM;
packet->dts = packet->pts = audioPosition;
audioPosition += packet->duration = FLV_TIMEBASE * packet->duration/audioRate;
//NSLog(@"audio position = %lld", audioPosition);
}
packet->pos = -1;
packet->convergence_duration = AV_NOPTS_VALUE;
// This sometimes fails without being a critical error, so no exception is raised
if((code = av_interleaved_write_frame(file, packet)))
{
NSLog(@"Streamer::Couldn't write frame");
}
av_free_packet(packet);