[LAU] OT - syncing partially out of sync video and audio in existing files

[Ralf Mardorf]

On Sat, 2011-06-11 at 11:24 +0200, pshirkey at boosthardware.com wrote:
> > Philipp <hollunder at lavabit.com> wrote:
> >> >> >> >
> 
> <snip>
> 
> >> > So it seems mencoder can just drop video frames.
> >>
> >> That's good to know. For references sake, what was the commandline that
> >> you ended up using?
> >
> > I wrote it in another post in this thread already, but here it is again:
> >
> >     1) Figure out the position at which the offset starts using mplayer.
> >
> >     2) Get the faulty part in a separate file, delay audio as necessary:
> >     mencoder -ss 02:47:55 -oac copy -ovc copy -delay -9.55 file.avi -o
> >     fileb.avi
> >
> >     3) Get the good part into another file:
> >     mencoder -endpos 02:47:55 -oac copy -ovc copy file.avi -o
> >     filea.avi
> >
> >     4) Put the parts back together again:
> >     mencoder -oac copy -ovc copy filea.avi fileb.avi -o
> >     filefixed.avi
> >
> >     filefixed.avi is the resulting fixed file.
> >
> > What I noticed though is that it's limited in granularity, maybe it has
> > something to do with keyframes. In my previous case I had 13 seconds cut
> > out instead of 9.55, but it seems like it can be more. I know far too
> > little about video or mencoder to tell what's really going on.
> > Well, it's ok for me to loose a couple of seconds and have synced audio.
> >
> >
> 
> I suspect you're not the only person who feels this tradeoff is a
> reasonable *default* choice.
> 
> It's functionality like this that could be relatively easily added to
> existing software and would make a huge difference to a lot of people over
> the years. The problem is knowing how to achieve the goal and automating
> that process. Seems like you have figured out a useful commandline method.
> Hopefully that will get picked up and integrated into a GUI solution at
> some point.

I guess when I used Kmenc15 or similar the cuts always were improper,
but IIRC ... http://kmenc15.sourceforge.net/screenshots.htm ... it's
possible to use manual input.