On Mon, Mar 3, 2014 at 4:32 PM, Net Keenest <thenetkeen...@gmail.com> wrote:
> Hi all,
>
> I have a strange problem when using Kdenlive, but which I think is due
> to MLT: I have a recording of a singer from two angles and I want to
> switch between them. However, AV never is in sync. There are problems
> with a scenario as simple as the following:
>
> Put a video on track 2, and the other on top of it on track 1. The
> position of the 1st is aligned (delayed) to the 2nd. Audio from both
> videos is active. Then I cut "holes" into the 1st to show track 2. The
> result is as follows:
>
> * In the render output and the project monitor (if the project is
> played from the beginning), AV gets out of sync only on track 2 (the
> audio belonging to the video!), but the two combined audio sync is
> fine.
>
> * If I seek to arbitrary positions (position with either holes or no
> holes, active video 1 or 2, respectively), AV sync on track 2 is fine,
> but A and V is not in sync with track 1 when it is active.
>
> So, either way, I can not reliably sync the two tracks. What can I do?
>
> Note: Track 2 material is obtained from a camcorder. It consists of
> several MPG files joined with the ffmpeg concat demuxer and transcoded
> to x264. I also tried -vsync cfr. When playing in melt or ffplay,
> video gets out of sync occasionally, frame drop is increased (ffplay
> fd=X value), and then resyncs.
>
You should try to transcode your clips to DNxHD. Within Kdenlive,
right-click the clips on the project tree and choose Transcode. Then, use
the transcoded versions. While we try to provide native format editing,
your mileage may vary. I know we still have problems with HDV.
In order to try to reproduce your problem, since I do not have multiple
camera clips from the same shoot, do you think I can reproduce it using the
same clip - on atop the other - by employing the same editing technique?
What format is your camcorder for Track 2? Do not answer MPG; that is
ambiguous. If you are unsure, what is your make and model?
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