What size should rips have?

[Cytrox]

Hi,

Some time ago I read that for DVD-rips using Mpeg4-ASP aiming at about half the size of the VOB file (in general) usually produces rips of a quality that one can't really tell wether it's a rip or the original

Now my question ist what is the ratio when using Mpeg4-AVC (well actually x264 itself)?

And what about BlueRay/HDDVD stuff?
(Does BlueRay/HDDVD rely on Mpeg2 just like DVDs?)


I know the question is somewhat stupid, and I know the answer "depends" on a lot of differnt things (like what features are turned on and what kind of movie it is, etc.) but what has you're expirience been so far, for the movies that you've backed up?

[linyx]

For dvds, i would say 1/3 size is transparent. And Blu-Ray uses either VC-1, AVC, or Mpeg-2.

[dat720]

If you use h264 with CRF at 18 or lower you will generally get 1/3 - 1/4 of original file size and probably won't see a difference, even at higher values like 22 it is hard to spot the difference.

[Soulhunter]

For ASP (XviD) it was more like a 1/4 compression gain for me to get really transparent results (so 75% of the VOBs size). With h.264 (x264) its another 1/3 compression gain for me compared to ASP (so, ~50% of the VOBs size). But that's mainly because my eyes are kinda trained (by years of video editing) to spot even the slightest differences n imperfections... ^^;

[Ryu77]

For ASP (XviD) it was more like a 1/4 compression gain for me to get really transparent results (so 75% of the VOBs size). With h.264 (x264) its another 1/3 compression gain for me compared to ASP (so, ~50% of the VOBs size). But that's mainly because my eyes are kinda trained (by years of video editing) to spot even the slightest differences n imperfections... ^^;

I would completely agree with that. Those that say DivX/Xvid can be about 25% in size and be transparent to the original either need their eyes checked or are viewing on a smaller CRT TV.

I will say though that H264 is amazingly efficient. I recently ripped a DVD to 33% of it's original size (1500MB) as a test, and I will say there was almost no perceivable quality loss at all. I will also say that as a result of various tests x264 seems to produce better results than Nero's AVC encoder.

[Blue_MiSfit]

Indeed.

In this day and age of cheap hard drives, it's silly to worry about hitting a specific file-size for burning to optical media, unless you have a specific need to do so.

For most of us, backing up our movies using x264 and whichever CRF value pleases our eyes is the way to go :) For me, that means CRF19.

Plus I usually use multithreaded MVDegrain2 on SD sources (encodes at 7fps using a very slow MeGUI profile on my Q6600, which is the same as unfiltered HD for the most part).

~MiSfit

[gizzin]

You'll get very good advice here. In my opinion if you want transparent quality at the same resolution, then 1/4 a DVD is pretty good. So about a gigabyte per movie. 1gig > 2hrs. Make sure you make use of all of x264 whistles and bells.