BD / DVD Digital Video Quality as compared to Uncompressed RAW video.

[Bonie81]

BD / DVD Digital Video Quality as compared to Uncompressed RAW video.

Here is simple calculation for uncompressed RAW NTSC 720X480 video file size bearing 1 HR (3600 sec) duration.

Pixels per frame = Framesize =720x480 = 345600
Bits/pixel = 1.00 Square Pixel
Bits/Frames = 345600 bits x 24 color depth = 8294400 bits = 1036800 bytes = 0.988 Mb
Frame Rate = 29.97fps
BitRate = 0.988 x 29.97 = 29.6334 Mb/sec
Video Size = 29.6334 Mb/sec x 3600 sec = 106680.322265625 MB = 104.18 GB

Now looking at true data storage capacity of BD, DVD-DL and DVD-R...
BluRay Disk Capacity = 50050629632 bytes = 46.61 GB
DVD-DL Capacity = 8543666176 bytes = 7.96 GB
DVD Capacity = 4707319808 bytes = 4.38 GB

This means, As compared to Original Uncompressed Video,
Blue Ray Disk 50 GB = 44.73% Quality
Blue Ray Disk 25 GB = 22.36% Quality
DVD-DL = 7.36% Quality
DVD-R = 4.20% Quality

I guess, it is nearly impossible to remove compression artifacts coz even BD stream contains hard to see artifacts.
What quality we can expect by compressing video more and more?

[Gavino]

Bits/Frames = 345600 bits x 24 color depth = 8294400 bits = 1036800 bytes = 0.988 Mb

For 4:2:0 subsampled chroma, you have only 12 bits per pixel, so your calculations are out by a factor of 2.

But anyway, bitrate is not the same as 'quality', so you can't say 'xxx=yyy% quality'.
The whole point of improved compression methods is to achieve the same (perceived) quality with a lower bitrate.

[Bonie81]

Let's say 104.18/2 = 54.09GB
Another issue is how long any professional mpeg encoder will take to compressed conversion with max. speed of 22fps?
Definitely Quality is an issue coz compression + filters does not really enhance video quality to same as original uncompressed. This is because i have observed tiny artifacts even in authentic BD having data 47 GB worth but hard to notice.

[hech54]

Umm...if you are "creating" this (now)uncompressed video from video that has already been compressed at least once...how can anyone possibly expect it to be any better quality?

[jagabo]

I don't really understand your point. If you just want to put an hour of D1 video on a Blu-ray disc you could use lossless compression and have no loss of quality. A Blu-ray player wouldn't play it though.