Hello,
I am the "Pierre" who, Haldun ALTAN gently relayed the message of
difficulty presented in this discussion. I finally managed to get on
your list.
I still have the same problems of mismatches in Cinelerra-CV 2.2
(demontration:
http://www.youtube.com/watch?v=Y72kpaIO2IY&list=FLh2m4XNEHyJxq_VPAOTbdUQ&index=1
)
I still have no solutions... but I made new tests with shooting in 50i
(PAL) DV and HDV (my camera can optionally operate 50i PAL in addition
to its normal mode 60i NTSC) and in this case I observed no mismatches
in Cinelerra, I can cut and insert the clips on the timeline as much as
I want without ever observe desynchronization ...
I also confirmed that the problem is also present in HDV 60i.
So it is clear 60i (NTSC) DV or HDV: Cinelerra does not maintain
synchronization after insertions moved clips on the timeline. But
Cinelerra does not show any problems in the case of sequences shot in
50i (PAL) DV or HDV.
But just to complicate things still... in the case of NTSC 60i... the
problem is not systematic and some clips lose their sync and others do
not... but nothing seems to distinguish them, they are from the same
source and have been integrated to the timeline in the same way...
And yes the command "Align cursor on frames" (Align to frame boundaries)
has been selected.
The mystery is complete...
I might decide to emigrate to Europe to resolve these desynchronization,
but I would prefer a simple patch...
Thank you for your help.
Pierre
Le 2013-01-19 17:30, Monty Montgomery a écrit :
Hello Haldan,
A canadien video maker, Pierre, from another liste (lprod/France) who had
some issues in subscribing to our liste, security announcement scares him,
There are some ongoing issues with the mailing list; the maintainers
are aware of them.
has a problem of synchronisation in editing for which we, on the other list,
couldn't bring him a solution.
Having watched the video and read your mail, I could not tell if
'Align to frame boundaries' is set. That's sort of a 'stupid
question' type suggestion, but if it's that's simple... :-)
http://www.mail-archive.com/[email protected]/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.
well, this would be responsible for an error of about a half sample at
a frame boundary (1/48000th of a second). I work almost exclusively
in 24000/1001 and don't have alignment issues--- but my workflow is
also somewhat different (I cut across tracks for additional
flexibility, not within a single timeline).
I am more worried about an error in the frame number calculation
caused by the noninteger framerate. Cinelerra certainly has some
examples of this.
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 ...
Hmmm... Would it be possible to send me the EDL (that is the save file
format) for the project pre-cut, post insertion and then again
post-stretch when the problem manifests? I'd like to see the internal
representation of what Cinelerra thinks it is doing there. I don't
need the media, just the EDL.
Monty
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