[MPlayer-users] [BUGS] Problems with MPlayer 1.0pre7 mpeg muxer

[Giacomo Comes]

On Wed, Oct 05, 2005 at 06:24:29PM +0200, Nico Sabbi wrote:
> Giacomo Comes wrote:
> 
> >>>>       
> >>>>
> >>>the attached patch should fix the telecine problems.
> >>>Please, test and report, both with 0/1/2 b-frames.
> >>>     
> >>>
> >>I have done yesterday a quick test with SVCD mpegs
> >>with 0/1/2 b-frames. The patch works.
> >>
> >>I will continue to do tests with DVD and submit a full report
> >>probably tomorrow.
> >>   
> >>
> >
> >Ok, here is a full report about the patch.
> >
> >What I'm going to say apply to both MPlayer 1.0pre7 and CVS.
> >
> >The patch works in the sense that now my DVD player can play
> >SVCD and DVD that are telecined AND with B-frames.
> >Without the patch such mpegs created with mencoder plays 
> >very badly (for example for SVCD the audio plays at normal 
> >speed and the video plays at 80% speed, about every 15 seconds
> >the audio stops to let the video come back in sync and then the 
> >proces repeats).
> >
> >But, with the patch applied, I have observed another problem.
> >I have done a SVCD created with the patched mencoder.
> >
> >The playback on my DVD player starts fine but then slowly
> >the audio anticipates the video. After 1-1.5 minutes
> >the delay can reach 1 second, and at some point the video 
> >accelerate to come back in sync.
> >
> >I have observed this phenomen with:
> >telecined mpeg (0 B-frames)
> >non telecined mpeg (30000/1001 fps) without B-frames
> >non telecined mpeg (30000/1001 fps) with B-frames
> >
> >The same kind of mpegs plays fine on the DVD player if I use 
> >the unpatched mencoder to create them.
> >
> >Of course, in all the cases, mplayer never has problem in playing
> >such mpegs.
> >
> >It would be good if somebody else could test the patch.
> >I don't think I'm doing something wrong, but it could be.
> >
> >Nico, can it be that the patch while fixing a bug, introduces
> >another one? Or simply make more evident another bug already
> >present (I was able to see the bug also with the unpatched mencoder 1.0pre7
> >using no telecine and no B-frames)?
> >
> >If you need specific tests please let me know.
> >
> >Giacomo
> 
> I suspect that mencoder is skipping and duplicating frames, is it?
> If so try to force it not to do it and see how the resulting video plays 
> in your dvd.

I will check this.

> I have another patch in mind that could fix another source of problems; 
> I'll post it
> when it's ready.
> BTW, did you notice any more of those dirburbing  jumping fields (echoed 
> from the past)
> that were so evident in the sample you linked?

Did you see the jumping fields with mplayer or a DVD player?
Because for me the sample plays fine with mplayer.

Giacomo