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If the DVD is NTSC, you're getting whatever aspect ratio the movie has squeezed into 720x480. When you buy a DVD, you're getting either 720 x 576 or 720x480. You answered prety much everything except the resolution of DVD and BD I read those on Wiki too, but there is nothing abour actual resolution. ps both big paragraphs are copy paste from wikipedia

Hard drives are cheap these days, it's not worth butchering already debatable quality by recompressing video. I would no longer recompress DVDs, I would just recompress audio if needed (from lossless pcm to ac3, aac or opus) and leave the video untouched. If you recompress using h264 or hevc, around 3-4 mbps for DVDs and around 10-15 mbps for Bluray are reasonable values.

So around 5-6 MB/s for bluray in original form This compares to HD DVD movies, which have a maximum data transfer rate of 36 Mbit/s, a maximum AV bitrate of 30.24 Mbit/s, and a maximum video bitrate of 29.4 Mbit/s. BD Video movies have a maximum data transfer rate of 54 Mbit/s, a maximum AV bitrate of 48 Mbit/s (for both audio and video data), and a maximum video bit rate of 40 Mbit/s. Software like DVDFab can rip a DVD and you can unselect non-essential stuff.įor users recording digital television programming, the recordable Blu-ray Disc standard's initial data rate of 36 Mbit/s is more than adequate to record high-definition broadcasts from any source ( IPTV, cable/satellite, or terrestrial). If you want you can also remove commentary tracks, though at 128-320 kbps they don't take much space.

You can get a DVD smaller by throwing out secondary audio tracks, or leaving just one format (some use 5.1 AC3 and same audio track as mp2 stereo for backwards compatibility, so you can remove the stereo track). Of this, up to 3.36 Mbit/s can be used for subtitles, a maximum of 10.08 Mbit/s can be split amongst audio and video, and a maximum of 9.80 Mbit/s can be used for video alone.Īssume up to around 1.2 MB/s (10 mbps) for DVDs, if kept in their original form. DVD-Video discs have a raw bitrate of 11.08 Mbit/s, with a 1.0 Mbit/s overhead, leaving a payload bitrate of 10.08 Mbit/s.