On Dec 08, 2012, at 00:06, Carl Eugen Hoyos wrote: > My guess now is that you argue that for two given codecs (no > matter if mjpeg, mpeg-4 asp, mpeg2video, flv1 or snow), the > following command line always produces files of nearly identical > size: > $ ffmpeg -i input -vcodec xxx out.avi
No, not always, but for the files I'm working with. When I compare > ffmpeg -i 4000kbaud.m4v -vcodec copy out1.mov > ffmpeg -i 4000kbaud.m4v -vcodec mpeg4 -b:v 4000k out2.mov > ffmpeg -i 4000kbaud.m4v -vcodec mjpeg -b:v 1150k out3.mov I get 3 output movies that are all at (approximately) 4000kbits/s, and all approximately the same size as the input. You may not agree, but it my experience that material that has already been compressed with a lossy codec is often hard to compress further - and in this case the input already shows visible blocking artefacts. In fact, 720x576 @ 12Hz, that gives almost 5000k pixels/s, so if I'm not missing something the content is already compressed to less than a bit per pixel ... and I have no idea if that's stretching it or not, in fact. 'night! R. _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
