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..srt - Movie subtitle file format (SubRip format)
.mp4 - MPEG-4 video file format
.flv - Flash video file
.m2ts - MPEG-2 stream (Blu-Ray)
.m4v - MPEG-4 video file format
.bup - Backup of DVD info file
.wmv - Windows Media Video
.mkv - Matroska video-audio multimedia file
file extension MTV - MTV video format
File extension MTV description:
MTV is file format supposedly created to allow video playback capabilities on inexpensive Chinese-made portable MP4 players without increasing the cost of those players with the license royalties (and more processor power).
The format operates by displaying a series of raw uncompressed rgb565/555 image frames while playing MP3 audio but as the files are of low resolution and frame rate, sizes are comparable to MPEG-1 or MPEG-2. (in a bytes-per-minute sense). Encoding and decoding are less processor-intensive than other contemporary formats, as in fact very little "encoding" is actually done.