it’s funny, I had the same problem when trying to put Spanish subtitles to mkv with mkvmerge, the live WDTV crashed with that video and did not play any until unplug from AC and turned on again. I noticed that, from the version 4.1.1 header compression option is activated , it may be that, I will try with version 4.0…
cause I was usin latest version…
I will try it…