On 2008-03-17 23:12, Terje J. Hanssen wrote:
> I'll turn that classical HDV question to; "Is HDV editing with Cinelerra
> possible on todays powerful laptops"?
Terje,
I have no trouble capturing (with dvgrab 3.0) and editing (with
Cinelerra 2.1CV compiled from CVS) HDV from Canon HV20 on my laptop
without any proxy files. I tried using proxy files but it is not worth it.
I have Dell Latitude D820, 3.3G RAM, Intel(R) Core(TM)2 CPU T7600 @
2.33GHz, NVidia Quadro NVS 120M video card with 256M of memory,
1920x1200 screen resolution. I keep video on an external USB 7200rpm
disk. I work under Fedora 6.
A few important things:
1) In the Preferences->Playback you need to disable 'Play every frame'
which was enabled by default. Without that it was impossible to work:
cinelerra would freeze and crash constantly.
2) The number of video files in the project should be small but the
files can be very large: there is no problem working with one 12G HDV
file but when I tried to divide it into ~100 small files with -autosplit
option of dvgrab, it was impossible to work: Cinelerra would consume
much more memory.
3) Occasionally after rendering video and audio might be a little out of
sync (so far I only had a constant shifts of the order of a second). To
figure out the size of the shift, I use mplayer's ability to change the
sync between audio and video while playing. After that I use avidemux to
fix the problem. One can introduce a shift in cinelerra and re-render
but it takes too much time. One can supply a shift argument to mplex but
I still find avidemux more convenient for this purpose. BTW, avidemux
can also edit HDV but I prefer cinelerra.
Igor
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