[MPlayer-dev-eng] [PATCH] mencoder, B-frames, and video/audio delay

[Michael Niedermayer]

Hi

On Thu, Jan 26, 2006 at 11:33:11AM -0800, Corey Hickey wrote:
> Michael Niedermayer wrote:
> >>no B-frames:                            perfect sync
> >>with B-frames:                          1-frame video delay
> >>x264 with many B-frames and b_pyramid:  2-frame video delay
> >>
> >>Those numbers confirm the expected decoding delay. The question of
> >>whether to compensate in mplayer or in mencoder remains...
> > 
> > 
> > how do you want to compensate this in mplayer? what about xine, vlc, ffplay,
> > ffmpeg, wmp, ...
> 
> I really have no idea how to compensate in mplayer.... If that's the
> right thing to do than I'll try to figure it out, but I can't guarantee
> anything.
> 
> xine (xine-lib 1.1.1):
> I can't compile the latest xine-lib release; sourceforge is being picky
> again, so I can't try CVS.
> 
> vlc (version 0.8.4):
> Looks ok, but I know I can't really notice a 1-2 frame delay at normal
> playback speed. VLC disables audio playback when playback speed isn't 100%.
> 
> ffplay (CVS)
> Has problems with PCM audio -- the audio playback sounds fine, but the
> video starts and stops. I've uploaded a sample to:
> http://fatooh.org/files/tmp/ffplay-pcm-problem.avi
> With MP3 audio instead, the playback is all right, except that lame
> encoding delays the audio (if I can fix that later, I will).
> 
> 
> WMP (9.0.0.2980)
> Reassigned file associations even after I specifically told it not to
> (sigh). Doesn't seem to have any playback speed controls, and I really
> can't tell if the sync is perfect or not.
> 
> Media Player Classic (6.4.8.7)
> Disables audio when frame-stepping, but not when playback speed is
> slowed. The A-V sync correlates with what I see in mplayer.

what about using low fps (1fps or so) video for this test, so no
special player capabilities are needed


> So, out of all that, I only got one set of useful data. Nevertheless,
> I'm in favor of compensating in mencoder, 

me too, but ive already said that before the whole disscussion

[...]

-- 
Michael