You can observe here interesting discussion.. https://video.stackexchange.com/questions/17531/are-mp2v-and-mpgv-valid-mpeg... while mov standart not allowed mpeg2 in mov, it also not disallowed it, and apparently some Apple software used such combination... (may be because writing full muxer/demuxer for mpeg was time consuming? speculation...) I added those two as formats, but then not sure how many software will play them (but we never know until we try! Uplayer for Andoid eat them..)