DVD:
Data Capacity: 8 GB (dual-layer)
Video encoding: MPEG-2
Max video quality: 9.8 Mb/s (most commonly 2-3 Mb/s with bursts to 6 Mb/s)
Max video size: 720 × 480 at 60 Hz (interlaced, IIRC)
Audio encoding: AC3 or DTS
Max audio quality: 24-bits/96 kHz lossy compressed standard, somewhat higher optional
Maximum video length: Less than two hours at maximum quality and resolution.
Blu-ray
Data Capacity: 50 GB (dual-layer)
Video encoding: MPEG-4 AVC
Max video quality: 40 Mb/s (commonly 20-30 Mb/s with bursts to 40 Mb/s)
Max video size: 1920×1080 at 24 Hz progressive (60 Hz interlaced)
Audio encoding: Many, including uncompressed HD audio at 8 Mb/s
Max audio quality: 24-bits/96 kHz lossless (no audio degradation due to compression) standard, up to 192 kHz optional.
Maximum video length: Over two hours at maximum quality and resolution.
Remember, the video encoding in Blu-ray is much more efficient, so you get better quality per-bit too, in addition to having a higher overall bitrate.
Good data, but 24 Hz frame rate interlaced at 60 Hz??? How does that work?
Lol, back to 24 fps, just like the good old, OLD days. :-)
Do you know how they dealt with the flicker at that rate back then? They flashed the image twice with a rotating shutter to preclude the persistence on the retina. The guy who thought of that was a genius.