Hello, I would like to simply convert from an ".avi" file to a ".mov" file. The input file is "from_jpg.avi" (it has been generated from a jpeg sequence and a wav file with this command : ffmpeg -i foo.%d.jpg -i bar.wav -vcodec mpeg4 -acodec mp3 from_jpg.avi) $ ffmpeg -i from_jpg.avi FFmpeg version SVN-r8540, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-gpl --enable-static --enable-swscaler --enable-pthreads --enable-libmp3lame --enable-libogg --enable-xvid --disable-ffserver --extra-ldflags=-static --enable-memalign-hack libavutil version: 49.4.0 libavcodec version: 51.40.2 libavformat version: 51.11.0 built on Mar 29 2007 11:04:31, gcc: 3.3.1 Input #0, avi, from 'from_jpg.avi': Duration: 00:00:08.5, start: 0.000000, bitrate: 2881 kb/s Stream #0.0: Video: mpeg4, yuv420p, 640x352, 25.00 fps(r) Stream #0.1: Audio: mp3, 48000 Hz, stereo, 64 kb/s Must supply at least one output file $ ffmpeg -i from_jpg.avi -vcodec copy -acodec copy from_avi.mov ; echo $? FFmpeg version SVN-r8540, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-gpl --enable-static --enable-swscaler --enable-pthreads --enable-libmp3lame --enable-libogg --enable-xvid --disable-ffserver --extra-ldflags=-static --enable-memalign-hack libavutil version: 49.4.0 libavcodec version: 51.40.2 libavformat version: 51.11.0 built on Mar 29 2007 11:04:31, gcc: 3.3.1 Input #0, avi, from 'from_jpg.avi': Duration: 00:00:08.5, start: 0.000000, bitrate: 2881 kb/s Stream #0.0: Video: mpeg4, yuv420p, 640x352, 25.00 fps(r) Stream #0.1: Audio: mp3, 48000 Hz, stereo, 64 kb/s Output #0, mov, to 'from_avi.mov': Stream #0.0: Video: mpeg4, yuv420p, 640x352, q=2-31, 25.00 fps(c) Stream #0.1: Audio: mp3, 48000 Hz, stereo, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 [mov @ 0x84f4340]track 1: codec frame size is not set Could not write header for output file #0 (incorrect codec parameters ?) 0 Would you know what is wrong ? As nothing seems special in my ffmpeg command line... And, how come it does not return an error code to the shell ? Regards, Nicolas