[MPlayer-dev-eng] smooth playback vs good avsync

[Frodo]

Hi, 

Ive played around a bit with mplayer and got some mixed feelings about it.
Its a great player, supports many codecs and maintains perfect avsync for most files
but the downside is that video is played back a bit jerky (not smooth)
I believe this is caused by the fact that mplayer tries to keep a perfect av sync. In order to do this
it has to render frames too early or too late. 
In fact I mp_msg() the frames rendered too early/late and the fps count and indeed the frames rendered too early/late is increasing constantly
and fps isn't very stable (25 fps encoded movie is jumping around 24.1 fps & 25.8 fps)

After tweaking around a bit I managed to get the playback much smoother while keeping a good a/v sync
for this I had to change the sleep algorithm in mplayer a bit.
I used is something like this (pseudo code)
maybe something like this can b added 2 mplayer either always on, or as an extra -smoothness option?

//============================== SLEEP: ===================================
time_frame/=playback_speed;
// if av delays is > 40 msec then use mplayers current algo to get better av sync
if (avdelay <= -0.04 || avdelay >=0.04)
{
    //use mplayers current sleep algorithm to correct the av sync
    if(time_frame>0.001 && !(vo_flags&256))
    {
         while (time_frame > 0.000) time_frame-=GetRelativeTime();
    }
}
else
{
    // av sync is within 40 msec, goto smoothness mode
    // and output each frame exactly on time
    if (!drop_frame && !frame_time_remaining && blit_frame)
    {
      float j4 = ((float)(GetTimer() - lastframeout_ts)) / 1000000.0;
      while(  j4 < frame_time)
      {
        j4 = ((float)(GetTimer() - lastframeout_ts)) / 1000000.0;
        time_frame-=GetRelativeTime(); // burn the CPU        
        if (j4 >= frame_time) break;
      }    
    }
    sh_video->timer -= time_frame;
    d_video->pts -= time_frame;
}

Frodo
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