Пытаюсь сконвертирировать видео
ffmpeg -i 1.mkv -map 0:0 -vcodec libx264 -r 24 -map 0:1 -b 512k -bt 512k -acodec aac -strict experimental -ac 2 -ab 128k -vpre veryslow -s 640x420 -threads 4 1234.mp4
ffmpeg version 0.7.6-4:0.7.6-0ubuntu0.11.10.1, Copyright (c) 2000-2011 the Libav developers
built on Jun 12 2012 16:44:09 with gcc 4.6.1
configuration: --extra-version='4:0.7.6-0ubuntu0.11.10.1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
WARNING: library configuration mismatch
avutil configuration: --extra-version='4:0.7.6ubuntu0.11.10.1+medibuntu1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3 --enable-vaapi --enable-libopenjpeg --enable-libfaac --enable-nonfree --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libopencore-amrnb --enable-version3 --enable-libopencore-amrwb --enable-version3 --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --enable-shared --disable-static
avcodec configuration: --extra-version='4:0.7.6ubuntu0.11.10.1+medibuntu1' --arch=amd64 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3 --enable-vaapi --enable-libopenjpeg --enable-libfaac --enable-nonfree --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libopencore-amrnb --enable-version3 --enable-libopencore-amrwb --enable-version3 --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --enable-shared --disable-static
libavutil 51. 7. 0 / 51. 7. 0
libavcodec 53. 6. 0 / 53. 6. 0
libavformat 53. 3. 0 / 53. 3. 0
libavdevice 53. 0. 0 / 53. 0. 0
libavfilter 2. 4. 0 / 2. 4. 0
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 52. 0. 0 / 52. 0. 0
[matroska,webm @ 0x2428560] Estimating duration from bitrate, this may be inaccurate
Seems stream 1 codec frame rate differs from container frame rate: 47.95 (5994/125) -> 23.98 (24000/1001)
Input #0, matroska,webm, from '1.mkv':
Duration: 00:21:47.59, start: 0.000000, bitrate: 384 kb/s
Stream #0.0(rus): Audio: ac3, 44100 Hz, stereo, s16, 384 kb/s (default) (forced)
Stream #0.1: Video: h264 (High), yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Output #0, mp4, to '1234.mp4':
Stream #0.0: Video: libx264, 640x420, q=0-69, 512 kb/s, 90k tbn
Stream #0.1: Audio: libfaac, stereo, s16, 128 kb/s
Codec type mismatch for mapping #0.0 -> #0.0
на выходи ничего, в чём проблема?
заранее спасибо