High definition; excellent quality retention even at smaller sizes. Best for older DVD players or legacy hardware.
Standard definition; higher loss of quality during compression. GMS179.mpg.mp4
The inclusion of both and .mp4 in your query suggests a question about video file conversion. If you are handling a video file with this name, here is how the formats compare: .mpg (MPEG-1/2) .mp4 (MPEG-4/H.264) Quality High definition; excellent quality retention even at smaller