File Formats, Resolutions and File Systems
DVRs can usually record and play H.264, MPEG-4 Part 2, MPEG-2 .mpg, MPEG-2 .TS, VOB and ISO images video, with MP3 and AC3 audio tracks. They can also display images (JPEG and PNG) and play music files (MP3 and Ogg).
Some devices can be updated to play and record in new formats.
Recordings from standard-definition television usually have 480p/i/576p/i while HDTV is usually in 720p/1080i.
DVRs usually record in proprietary file systems for copy protection, although some can use FAT file systems.
Read more about this topic: Digital Video Recorder
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