hi IOhannes,

thank you for your interest. here's the video (long life to gary burton).

http://www.workinprogress.ca/pd/gem/

i was wrong! lqtplay takes the same cpu as gem when not rendering (pix_texture). ffplay is the best player for the quicktime jpeg with only 16% of my cpu.

why i would like to have ffmpeg / mpeg4 in gem is because of the size of the movie (3.5M for mpeg4 / 10M for quicktime and mjpeg).

i would like to know what format / codec people use with pix_film under linux. patrick

IOhannes m zmoelnig wrote:

patrick wrote:

...

hi,

i am on linux running the very last version of gem from cvs. i am trying to find a good codec for gem. here's my basic research:

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the best codec for quicktime is jpeg: transcode -i yourvideo -y mov,null -F jpeg,,jpeg_quality=70 -o gem.mov

gem cpu usage is 38% mplayer cpu usage is 27% ffplay cpu usage is 16% lqtplay cpu usage is 1% **

• lqtplay seems to make a excellent job for decoding is own codec. would

it be possible to make a pix_qt based on the source of this player???

which coded is Gem using to decode the mov? if it is quicktime4linux, then the results for _decoding_ should not differ so much.

apart from the fact that Gem uses openGL to display the video, which is portentially slower than xv-overlay...could you test to only decode the videos with [pix_film], without any [pix_texture] and compare these? and put your video-files online so other people can participate in the review?

fmar IOhannes

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hi,

first of all, gem is now compiling fine under gutsy (no more problem with avifile).

what i am looking for is to playback the video back and forth, skip frames etc... there's an option when encoding with ffmpeg to put a keyframe every frame. so maybe not just jpeg codec can do the job... example:

ffmpeg -i cow.avi -deinterlace -cropleft 40 -cropright 40 -b 300 -intra cow.mpg (-intra = keyframe every frame)

will produce a mpeg1video. trying to load this movie in gem doesn't work. gem report 0 frame (it doesn't crash).

mpeg3toc cow.mpg cow.toc and loading cow.toc will crash gem.

if i load the DV (cow.avi) in gem, 35% of my cpu is used. that's not bad...

patrick

hi,

another example: ffmpeg -i theremin.avi -vcodec xvid -an -intra -deinterlace -cropleft 40 -cropright 40 -sameq xvid.avi

codec xvid, playing in mplayer takes 5% of my cpu. in gem it takes 80% of my cpu? anyone can test? http://www.workinprogress.ca/pd/gem/xvid.avi

xvid is playing fine with aviplay, ffplay. i wonder what gem is using for playback this codec: avi or ffmpeg. i don't know how to tell gem what "player" to use: ffmpeg, libavifile, quicktime?

patrick