Well there doesn't seem to be ac3 decoder on Jolla, so ac3 audio is out. MKV (matroska) files play, but aren't seekable. So I guess the best modern file format would be mp4, video h.264, audio aac. Screen resolution is 960x540, so no need for higher resolution than that. If using ffmpeg like in your example, something like this should work. (just tested these and seemed to work) -s 960x540 -vcodec libx264 -crf 25.0 -acodec libvo_aacenc -b:a 128k -ac 2