hi vade,
on linux using transcode, but sometimes ffmpeg or mencoder.
examples:
quicktime - jpeg (4.0M) http://www.workinprogress.ca/pd/gem/codec/out_jpeg.mov
gem 22% cpu - showing the video gem 17% cpu - just decoding the video mplayer xv 5% cpu mplayer gl 9% cpu
transcode -i dvd.vob -c 500-1000 -y mov,null -F jpeg,,jpeg_quality=70 -G 1.1 --pre_clip 6,18,6,18 -J denoise3d=2,pp=lb -Z 640x480 --zoom_filter Mitchell -o out_jpeg.mov
avi - mjpeg (4.1M) http://www.workinprogress.ca/pd/gem/codec/out_mjpeg.avi
gem 19% cpu - showing the video gem 14% cpu - just decoding the video mplayer xv 5% cpu mplayer gl 9% cpu transcode -i dvd.vob -c 500-1000 -y ffmpeg,null -F mjpeg -G 1.1 --pre_clip 6,18,6,18 -J denoise3d=2,pp=lb -Z 640x480 --zoom_filter Mitchell -o out_mjpeg.avi
avi - xvid (933K) http://www.workinprogress.ca/pd/gem/codec/out_xvid.avi
gem 90% cpu - just decoding the video mplayer xv 3% cpu mplayer gl 7% cpu transcode -i dvd.vob -c 500-1000 -y ffmpeg,null -F xvid -G 1.1 --pre_clip 6,18,6,18 -J denoise3d=2,pp=lb -Z 640x480 --zoom_filter Mitchell -o out_xvid.avi
ffmpeg / mpeg4 (977K) http://www.workinprogress.ca/pd/gem/codec/out_mpeg4.avi
gem 90% cpu - just decoding the video mplayer xv 3% cpu mplayer gl 7% cpu transcode -i dvd.vob -c 500-1000 -y ffmpeg,null -F mpeg4 -G 1.1 --pre_clip 6,18,6,18 -J denoise3d=2,pp=lb -Z 640x480 --zoom_filter Mitchell -o out_mpeg4.avi
i tested some mpeg2video, but since gem is crashing when loading the .toc file i cannot know if there's more consumption of cpu in gem vs mplayer / ffplay etc...
maybe there's another codec to try? patrick