your .tts file plays OK on the WDTV but as you say there is no seek and ff/rewind. Trying to remux it directly with mkvmerge throws up the following error “Error: Found B frame without second reference in a non closed GOP. Fix the MPEG2 video stream before attempting to multiplex it.” which is presumably why the WDTV can’t ff etc.
However if you demux it first into the *.m2v video stream and *.mp2 audio streams, mkvmerge will mux it as an mkv file which can be ff’ed and rewound etc. in the WDTV. I can’t see any other way of achieving this otherwise.
