Hello,
A canadien video maker, Pierre, from another liste (lprod/France) who
had some issues in subscribing to our liste, security announcement
scares him, has a problem of synchronisation in editing for which we, on
the other list, couldn't bring him a solution.
I bring you the problem here by to see if anyone from the list can help
him to resolve his problem.
He has to finish an editing work.
If you want to write him directly his mail adresse :
p.autourdugl...@gmail.com
Otherwise I will transfer to him the answers :))
Haldun
Here his problem in his words :
Hello,
Desynchronizations occur during displacement and insertion sequences
already present on the timeline.
I use Cinelerra-CV 2.2 under Ubuntu 12.04 64bit (including all updates)
and Gnome "Classic without effects."
I am a beginner in editing but a professional director in video.
For this project, I shot with my own camera (HVR-Z1U) in "DV" NTSC 29.97
frames/second, "16/9", 2x soundtracks 48kHz "lock mode". All my shots
were captured by dvgrab in "dv2" (.avi). dvgrap has automatically
segmented transfers for each camera startup.
Frequently (but not always), if I move a sequence already present on the
timeline to fit inside another sequence on the timeline, I find myself
with sync sound problems at the beginning of the sequence segment
following the insertion point.
Thesedesynchronizations do not appear immediately after insertion, they
are visible and audible if I lengthens the beginning of the sequence
that follows the inserted segment.
All this explanation is a bit complex and difficult ... and it is best
to watch the demonstration viveo capture I made of the problem and
placed on the following link:
http://www.youtube.com/watch?v=Y72kpaIO2IY&list=FLh2m4XNEHyJxq_VPAOTbdUQ&index=1
After reading the following discussion in the list archives Cinelerra-CV:
http://www.mail-archive.com/cinelerra@skolelinux.no/msg03322.html
I have to wonder if the problem is not related to the Cinelerra-CV way
to manage NTSC frame rate of 29.97 frames/second. Which, according to
the link provided, would lead to mismatches related to differences in
length of image and sound tracks, and fragments of sound, remaining
after cutting.
It is as if the cuts I made on the timeline, leaving debris soundtracks
(which would have exceeded the cut point on the video track) and
subsequently contaminating sequences that follow the insertion ...
This problem is very annoying and undermines my editing work, it is also
difficult to understand ... and more to find a solution ...
Thank you for your attention.
Pierre
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