I was advised to encode my HD files with ffmpeg to DNxHD proxy with 220M bitrate rather then 45M so the image doesnt have too much artifacts. I reduced the framerate to 29.97 fps when I encoded the clips and the project is also 29.97 fps.
The minute I apply an effect to my video track, playback is choppy in the compositor window (Cinelerra-CV) and I need to evaluate the clip with effects and see the motion in real-time. My computer is 4 core AMD 3.4 GHz with 12G memory. Ubuntu LTS 10.04.4 with desktop effects OFF. Decent Sata2 drives.
I don't want to re-encode my original clips at this point, so instead I was stuck rendering parts of the project to mpeg4 since it seems faster so I can add a couple of more effects. But some other clips that didnt need anymore effects were rendered to RGBa uncompressed to preserve quality. Now I dont know what to encode my final project to!! Its a potential mess! Anyone has an idea how to proceed?
And for the future, what the heck should I be encoding to next time?? (for Cinelerra). I'm having a hard time finding help in IRC etc, I hope there is a happy ending!