Oooh, silly me! The problem seems to be solved. (Just by trying the quick test above. Let's see, if the whole video really works., though.) Embarassing that I got the idea just now. I am very sorry.
In case you are interested: The problem was that I forgot to finalize the DVD-RW disc after recording. Since the camcorder was borrowed, I did not have access to it to finalize the disc later. Therefore, I copied the raw disc to an image file and ran photorec. It recovered MPG files which I joined with the ffmpeg concat demuxer and transcoded (with some filters applied) to x264. However, some timing information seems to have been lost during the process. I now tried: tail -c +NNNN Camcorder.img | ffmpeg -i - -vf morestuff test.mp4 The aforementioned test does not fail anymore. On Tue, Mar 4, 2014 at 4:33 AM, Dan Dennedy <d...@dennedy.org> wrote: > 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? > ------------------------------------------------------------------------------ Subversion Kills Productivity. Get off Subversion & Make the Move to Perforce. With Perforce, you get hassle-free workflows. Merge that actually works. Faster operations. Version large binaries. Built-in WAN optimization and the freedom to use Git, Perforce or both. Make the move to Perforce. http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk _______________________________________________ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
