Re: [CinCVS] MPEG Video - Audio sync problem on Debian Etch AMD64

[Alan Chandler]

On Wednesday 16 May 2007, Pieter Thysebaert wrote:
> Hello,
>
> I'm using Cinelerra 2.1.0-2svn20070209 on Debian Etch AMD64 from
> http://giss.tv ./ Packages.
>
> When opening an MPEG Video clip (mpeg1video, mp3 audio, converted
> from flash video using ffmpeg) of several minutes (the video plays
> just fine in Xine) , I have the following problem.
> When playing the video, audio and video are in sync at the beginning.
> However, as the video progresses, the audio starts to lag (about 1s
> per minute of video).
> The audio and video tracks are of equal length in the main window and
> show up as such.

One possible cause of this is not enough umph.  Go to the settings menu, 
chose preferences and look under the playback tab.  Is the Play Every 
Frame ticked under the Video Out section.

I had the same problem, and unticking that solved it.

I am running with a Core 2 Duo and thought I would have enough umph.  
But didn't (it should tell you what rate you are achieving against the 
projects requirement).

-- 
Alan Chandler
http://www.chandlerfamily.org.uk

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[CinCVS] MPEG Video - Audio sync problem on Debian Etch AMD64

[Pieter Thysebaert]

Hello,

I'm using Cinelerra 2.1.0-2svn20070209 on Debian Etch AMD64 from 
http://giss.tv ./ Packages.

When opening an MPEG Video clip (mpeg1video, mp3 audio, converted from
flash video using ffmpeg) of several minutes (the video plays just fine
in Xine) , I have the following problem.
When playing the video, audio and video are in sync at the beginning.
However, as the video progresses, the audio starts to lag (about 1s per
minute of video).
The audio and video tracks are of equal length in the main window and
show up as such. 

Due to the audio lagging, I can not get the last part of the audio to
play - it simply seems missing from the audio track (although the audio
and video tracks show up as being of equal length). Even when I only
send the audio track to the Compositor window, I never hear the last part.

This audio lag (and missing endpiece) also affects rendering to (at
least) MPEG1 video and mp3 audio. The lag is just the same in the
rendered file as in the compositor window. Actually what happens is when
I cut some part of both video and audio tracks, I have part of the video
track and a delayed part of the audio track, which then results in a
no-good output file.

I have googled for mpeg sync problems and have some people with similar
problems, but have not found an effective answer to my problem.

Does anyone know what's going on?

Thanks,
Pieter

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