Hi August,
It seems that FCP uses intermediate codec to make HDV editing. (maybe
the conversion is made internally)
Even if you can read two tracks with HDV medias. The computer will slow
down if you want to add effects.
One solution is to use proxy editing ==>
http://cv.cinelerra.org/docs/wiki/doku.php?id=english_manual:cinelerra_cv_en_21#hdv_1080i_editing_using_proxy_files
Good luck august
On 2009-03-21 22:31, august wrote:
>
> hey y'all,
>
>
> I'm in Mexico city trying to help the Centro Nacional de las Artes
> develop a workshop/online educational material on Cinelerra. This
> is a pretty exciting opportunity and we are lucky to be able to have
> a 4 processor (each dual core) Macintosh at hand to set up an
> editing station. It is a dual boot machine with osx on one side and
> the latest ubuntu on the other, with Cinelerra running on the ubuntu
> side of course.
>
> My problem at the moment is speed. We have 1440x1080 interlaced DV
> footage (taken from the last Piksel festival no less) and while it
> plays a single track of video just dandy, when I add a second track
> that is to play simultaneously with another track (above it), the
playback
> slows down considerably. It doesn't matter if the top video is at
> 100% opacity, whenever there are two video tracks on the
> time-line...the video is slow.
>
> Of course, those of the people here who use final cut on the mac
> side are not so happy about this....since final cut can easily play
> two tracks of HD DV footage at once on the same machine.
>
> I see that the CPU's are all being used and that it is not maxed out
> there. I've tried everything in the Cinelerra handbook, but to no
> avail. The machine has SATA drives ...so hdparm doesn't really
> work to speed up the harddrive (afaik)....even though I doubt the
> bottleneck is the harddrive. I've tried switching the internal
> format to YUV, YUVA, RGB...etc.. No speed up. I've tried
> switching the viewer to use X11, X11-XV, OpenGL...etc...and there
> was some speedup with OpenGL, but not enough.
>
> I've also tried all of those options on the compiled community
> version, the compiled ADam Williams version, and the akirad
> cinelerracv-smp version.
>
> I have a feeling it is something internal to Cinelerra....or could
> there be some magical Xorg server command that saves the day?
>
> If you have any ideas or any suggestions, I'd love to hear it.
>
> -august.
>
>
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