flac This should select the best audio stream available. SRT, SSA, USF (general subtitle format) and VobSub (DVD subtitle format) are supported by MKV files. If you want to set custom sizes in FFmpeg, please remember that the width parameter (1280) comes before height (720). Welcome! Here you'll find the latest versions of FFmpeg for Linux kernels 3. It will only work with the MKV file because the subtitle format stored in the MP4 file is not easily converted to a SRT file. You'll have to research the docs for more settings, I don't use mkv much except with ffv1 for archiving. Ffmpeg bdmv to mkv root #emerge -ask media-video/ffmpeg (If somebody successfully uses MPlayer/MPlayer2 to dump PCM specified chapters, feel free to add it to this Wiki page and retitle appropriately.