ffmpeg:
ffmpeg version 0.7.2-4:0.7.2-1ubuntu1, Copyright (c) 2000-2011 the Libav developers
built on Oct 2 2011 15:13:26 with gcc 4.6.1
configuration: --extra-version='4:0.7.2-1ubuntu1' --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
libavutil 51. 7. 0 / 51. 7. 0
libavcodec 53. 5. 0 / 53. 5. 0
libavformat 53. 2. 0 / 53. 2. 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 @ 0x1d4c340] Estimating duration from bitrate, this may be inaccurate
Input #0, matroska,webm, from '1.webm':
Duration: 00:04:32.37, start: 0.000000, bitrate: N/A
Stream #0.0: Video: vp8, yuv420p, 640x360, PAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 29.97 tbc (default)
Stream #0.1: Audio: vorbis, 44100 Hz, stereo, s16 (default)
Output #0, mp3, to 'video.mp3':
Stream #0.0: Audio: [0][0][0][0] / 0x0000, 44100 Hz, stereo, s16, 64 kb/s (default)
Stream mapping:
Stream #0.1 -> #0.0
Encoder (codec id 86017) not found for output stream #0.0