Aa precis, nu dyker inte det felmeddelandet upp längre utan ett annat 
Kod:
ffmpeg -i how.i.met.your.mother.s05e17.720p.hdtv.x264-immerse.mkv -acodec libfaac -ab 128kb -ac 2 -s 800x480 -vcodec libx264 -aspect 16:9 how.i.met.your.mother.s05e17.720p.hdtv.x264-immerse.mp4
FFmpeg version SVN-r22469, Copyright (c) 2000-2010 the FFmpeg developers
built on Mar 11 2010 18:09:37 with gcc 4.4.1
configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-pthreads --enable-libfaac --enable-libfaad --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libx264 --enable-libxvid --enable-x11grab
libavutil 50.11. 0 / 50.11. 0
libavcodec 52.58. 0 / 52.58. 0
libavformat 52.55. 0 / 52.55. 0
libavdevice 52. 2. 0 / 52. 2. 0
libswscale 0.10. 0 / 0.10. 0
libpostproc 51. 2. 0 / 51. 2. 0
[matroska @ 0x20f93c0]Estimating duration from bitrate, this may be inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 47.95 (48000/1001) -> 24.00 (24/1)
Input #0, matroska, from 'how.i.met.your.mother.s05e17.720p.hdtv.x264-immerse.mkv':
Duration: 00:21:06.00, start: 0.000000, bitrate: N/A
Stream #0.0(eng): Video: h264, yuv420p, 1280x720, PAR 1:1 DAR 16:9, 47.62 fps, 24 tbr, 1k tbn, 47.95 tbc
Stream #0.1(eng): Audio: ac3, 48000 Hz, 6 channels, s16
Metadata:
title : English
[libx264 @ 0x215b2a0]broken ffmpeg default settings detected
[libx264 @ 0x215b2a0]use an encoding preset (vpre)
Output #0, mp4, to 'how.i.met.your.mother.s05e17.720p.hdtv.x264-immerse.mp4':
Stream #0.0(eng): Video: libx264, yuv420p, 800x480 [PAR 16:15 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 24 tbc
Stream #0.1(eng): Audio: aac, 48000 Hz, 2 channels, s16, 128 kb/s
Metadata:
title : English
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
Sorry att jag är jobbig!