Tutorial 04: Spawning Threads
没什么大问题，就是新建了一个数据VideoState数据结构，然后生成两个新的Thread分别，
把音视频从文件取出，和一个专门视频解码的线程。用SDL的一个自动刷新功能，把视频帧送到屏幕上。
下面的代码，就是需要tutorial5来解决的同步问题。
vp = &is->pictq[is->pictq_rindex];
/* Now, normally here goes a ton of code
about timing, etc. we're just going to
guess at a delay for now. You can
increase and decrease this value and hard code
the timing - but I don't suggest that ;)
We'll learn how to do it for real later.
*/
schedule_refresh(is, 80);
/* show the picture! */
video_display(is);
因为没有音视频同步，所以固定一个delay实践是80毫秒.
Tutorial 05: Sync Video 有些困惑，为什么出现PTS 等于一个packet->dts呢
一、 困惑
for(;;) {
if(packet_queue_get(&is->videoq, packet, 1) < 0) {
// means we quit getting packets
break;
}
pts = 0;
// Save global pts to be stored in pFrame in first call
global_video_pkt_pts = packet->pts;
// Decode video frame
len1 = avcodec_decode_video(is->video_st->codec, pFrame, &frameFinished,
packet->data, packet->size);
if(packet->dts == AV_NOPTS_VALUE
&& pFrame->opaque && *(uint64_t*)pFrame->opaque != AV_NOPTS_VALUE) {
pts = *(uint64_t *)pFrame->opaque;
} else if(packet->dts != AV_NOPTS_VALUE) {
pts = packet->dts;
} else {
pts = 0;
}
pts *= av_q2d(is->video_st->time_base);
avcodec_decode_video 是具有视频帧重新排列功能的（http://bbs.chinavideo.org/redirect.php?tid=7186&goto=lastpost&styleid=14），也就是说它输出的帧的顺序就是显示的顺序：IBBP, 进入的顺序是IPBB。难道总是执行的红色代码？
去做实验试试！！！
不是红色的代码，走的都是粗体的代码。
二、PTS：
PTS 每两个会有一个不连续的大数值，似乎是IPBB P是那个大数值，DTS 数值是连续的。
如果是avi格式的，解码出一个Packet就会有一帧。
如果是mpg格式的，例如下面的log，就会先有两个Packet，然后再输出一帧，以后就没读一个Packet就出一帧了。
这符合IPBB理论，得先解码出IP然后才能出I，然后读B，才可以出B。这样总是会cache一帧。
个人认为：其实使用者不必关心PTS，因为FFMPEG已经帮助我们进行顺序调整了，所以，只要用DTS做个步调就可以。
三、下面来看看，把视频同步到音频：
三个时间数值进行综合比较，delay是pts和上次PTS的差，diff是PTS和音频的PTS的差，frame_timer是记录了
上次系统的时间。
delay
= vp->pts - is->frame_last_pts; /* the pts from last time */
if(delay <= 0 || delay >= 1.0) {
/* if incorrect delay, use previous one */
delay = is->frame_last_delay;
}
/* save for next time */
is->frame_last_delay = delay;
is->frame_last_pts = vp->pts;
/* update delay to sync to audio */
ref_clock = get_audio_clock(is);
diff
= vp->pts - ref_clock;
/* Skip or repeat the frame. Take delay into account
FFPlay still doesn't "know if this is the best guess." */
sync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD;
if(fabs(diff) < AV_NOSYNC_THRESHOLD) {
if(diff <= -sync_threshold) {//如果视频跑得慢了
delay = 0;
} else if(diff >= sync_threshold) { //如果视频跑得快了
delay = 2 * delay;
}
}
is->frame_timer
+= delay;
/* computer the REAL delay */
actual_delay = is->frame_timer - (av_gettime() / 1000000.0);
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