Hi, I'm trying to put together a realtime video installation that can seamlessly switch between different videos. I have been trying to use mencoder essentially as a frameserver piping to mplayer but I've run into a bunch of problems, to wit: 1) Using rawvideo and rawaudio rapidly causes desync. It seems impossible to know beforehand how many video frames mencoder is going to pipe out--it drops frames from the stream to keep time with the (ignored) audio stream and -rawaudio/-rawvideo will output different amounts of data anyways--see the difference in seconds for the two commands below (the example file is 29.970 fps): mencoder -of rawvideo -oac pcm -ovc raw Tape_004-12.mov -frames 30 -o video.raw ... Video stream: 667799.375 kbit/s (83474925 B/s) size: 83558400 bytes 1.001 secs 31 frames mencoder -of rawaudio -oac pcm -ovc copy Tape_004-12.mov -frames 30 -o audio.raw ... Audio stream: 768.000 kbit/s (96000 B/s) size: 92892 bytes 0.968 secs I may be able to solve this by getting video in a different format (which has natively perfect sync between audio and video) but I have no idea what codec I should be looking into. 2) There doesn't seem to be a muxed stream format which can both be concatenated easily (i.e. cat video_1.stream video_2.stream > video_1_and_video_2.stream) and doesn't degrade video quality (I'm trying to maintain the quality of the input video, which will be at least 1280x1080). MPEG1 and MPEG2 degrade quality and I simply can't get vcodec=dvvideo to work regardless of what I throw at it. Does anyone have any suggestions? I am open to using software other than mencoder/mplayer, but traditional frameserver solutions are problematic as I need to be able to stack additional videos into its queue on the fly. Thanks for your time & patience, Jeff -- Jeff Garneau (919) 225-9579
