[MEncoder-users] A-V sync tools

[Guillaume LACHAUD]

Le 06/12/2009 01:58, Chris Capon a écrit :
> Laine Lee wrote:
>> I suppose you're talking about an adjustment that's a little more 
>> precise
>> than the increments of 100 milliseconds that you get when you press 
>> the plus
>> or minus key while playing in mplayer.
> Yes.  It is difficult to synchronize just by ear.  You can get the 
> audio fairly close but not exact.  I wondered about tools which would 
> help sync more precisely.
>
> I've tried a number of open source video editing tools but very few 
> show the audio waveform aligned with each frame.  I wonder if MPlayer 
> would benefit from this feature to help fine tune the -delay option.
>
> In the end, there were two tools which seem to handle the job.
>
> Cinelerra worked the best.  You can zoom in on the waveform both 
> horizontally and vertically, then move single video frames at a time 
> and watch the waveform progress.
>
> Kdenlive also shows the waveform but as a very small image.  There may 
> be a way to zoom in on the details but I didn't find it.
>
>
> Cheers,
> Chris.
>
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OK thanks I wil have a look at this. But I don't understand why by using 
-noskip mencoder cuts me the blacks frames at the start of my film. When 
launching mencoder with verbose option I can notice "initial 
v_pts=0.924". does it means it starts the file at 0.92 seconds (it would 
match woth the missing frames at the start of the file). Thanks, I like 
to understand how it works.