[ubuntu] ffmpeg black screenshot issue

view full story

http://ubuntuforums.org – I recently installed ffmpeg and other software according to this guide: http://ffmpeg.org/trac/ffmpeg/wiki/U...mpilationGuide Whenever I use the following command (or any similar command) to take a screenshot of a file, I end up with a 6kB black screenshot: ffmpeg -ss 120 -i input.mkv -vframes 1 -f image2 pic.png Is there another codec I need? Also, I'm using Ubuntu 11.10 64-bit. (Hardware)