I'm trying to convert this mpg video into a mp4 video troughtout libxvid, leaving the audio (MPEG version 1 layer 2) unchanged, using mov as container The resulting mov file has no audio. To be precise, it has an audio stream according to MediaInfo, but it simply don't play nor in VLC nor in WMP troughtout ffdshow This does not happen when using avi as container, only with mov I use the last SVN HEAD compiled under win32 by cygwin. Command line: c:\cygwin\usr\local\bin\ffmpeg -i %1 -vcodec libxvid -acodec copy -qscale 7 %1.mov 1>ffmpegstdcout.log 2>ffmpegstderr.log ffmpeg output: FFmpeg version SVN-r15958, Copyright (c) 2000-2008 Fabrice Bellard, et al. configuration: --enable-static --enable-shared --extra-ldflags=-L /usr/local/lib --enable-libmp3lame --enable-gpl --enable-libxvid libavutil 49.12. 0 / 49.12. 0 libavcodec 52. 4. 0 / 52. 4. 0 libavformat 52.23. 1 / 52.23. 1 libavdevice 52. 1. 0 / 52. 1. 0 built on Nov 30 2008 13:53:05, gcc: 3.4.4 (cygming special, gdc 0.12, using dmd 0.125) Input #0, mpeg, from 'C:\smallnoadio.mpg': Duration: 00:00:50.35, start: 0.374689, bitrate: 1627 kb/s Stream #0.0[0x1e0]: Video: mpeg1video, yuv420p, 352x240 [PAR 200:219 DAR 880:657], 1280 kb/s, 29.97 tb(r) Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16, 320 kb/s Output #0, mov, to 'C:\smallnoadio.mpg.mov': Stream #0.0: Video: libxvid, yuv420p, 352x240 [PAR 200:219 DAR 880:657], q=2-31, 200 kb/s, 29.97 tb(c) Stream #0.1: Audio: mp2, 44100 Hz, stereo, s16, 320 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 [mov @ 0x781a20]Warning, using MS style audio codec tag, the file may be unplayable! Press [q] to stop encoding frame= 76 fps= 0 q=7.0 size= 149kB time=2.40 bitrate= 506.8kbits/s frame= 140 fps=139 q=7.0 size= 356kB time=4.49 bitrate= 649.6kbits/s frame= 209 fps=139 q=7.0 size= 595kB time=6.82 bitrate= 715.1kbits/s frame= 279 fps=139 q=7.0 size= 824kB time=9.09 bitrate= 742.6kbits/s frame= 346 fps=138 q=7.0 size= 1036kB time=11.42 bitrate= 743.6kbits/s frame= 408 fps=135 q=7.0 size= 1209kB time=13.43 bitrate= 737.3kbits/s frame= 471 fps=134 q=7.0 size= 1398kB time=15.57 bitrate= 735.5kbits/s frame= 534 fps=133 q=7.0 size= 1588kB time=17.63 bitrate= 737.8kbits/s frame= 606 fps=134 q=7.0 size= 1796kB time=20.06 bitrate= 733.2kbits/s frame= 674 fps=134 q=7.0 size= 1998kB time=22.33 bitrate= 732.9kbits/s frame= 744 fps=135 q=7.0 size= 2227kB time=24.66 bitrate= 739.9kbits/s frame= 814 fps=135 q=7.0 size= 2443kB time=27.04 bitrate= 740.2kbits/s frame= 885 fps=136 q=7.0 size= 2647kB time=29.36 bitrate= 738.4kbits/s frame= 955 fps=136 q=7.0 size= 2844kB time=31.74 bitrate= 734.0kbits/s frame= 1029 fps=137 q=7.0 size= 3037kB time=34.17 bitrate= 728.2kbits/s frame= 1096 fps=136 q=7.0 size= 3213kB time=36.39 bitrate= 723.4kbits/s frame= 1166 fps=137 q=7.0 size= 3394kB time=38.69 bitrate= 718.8kbits/s frame= 1220 fps=135 q=7.0 size= 3563kB time=40.54 bitrate= 720.0kbits/s [mpeg1video @ 0x699450]ac-tex damaged at 20 8 [mpeg1video @ 0x699450]slice mismatch [mpeg1video @ 0x699450]Warning MVs not available [mpeg1video @ 0x699450]concealing 66 DC, 66 AC, 66 MV errors frame= 1282 fps=134 q=7.0 size= 3732kB time=42.58 bitrate= 718.1kbits/s frame= 1343 fps=134 q=7.0 size= 3947kB time=44.64 bitrate= 724.2kbits/s frame= 1413 fps=134 q=7.0 size= 4131kB time=47.02 bitrate= 719.7kbits/s frame= 1486 fps=134 q=7.0 size= 4293kB time=49.40 bitrate= 712.0kbits/s [mpeg1video @ 0x699450]end mismatch left=8348 4E665C [mpeg1video @ 0x699450]Warning MVs not available [mpeg1video @ 0x699450]concealing 330 DC, 330 AC, 330 MV errors frame= 1509 fps=135 q=7.0 Lsize= 4376kB time=50.16 bitrate= 714.8kbits/s video:2388kB audio:1959kB global headers:0kB muxing overhead 0.671734%