0.66 Quality Question

[bavaria35]

Just started testing with version 0.66 VIP and tried the First dvd of the Alien Quadrilogy. (seamless br) I am wondering…..the total size of the dvd is 6.2 GB and the predicted results are well, just very poor. I did some dvd’s with pervious versions that are 7.4 GB in size and avg bitrate was much better. What’s causing this poor bitrate? It looks to me that the amount of video data should give me a much better quality in theory……Are these normal results and can I change something to get better quality???

I removed the DTS and 2ch AC3 stream and also tried the reduction of the extras by 50%. The results were 0% reduction from the steal space feature)

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[11:23:54] Phase I, PREPARATION started.
- VTS_01: 3.189.528 sectors.
-- ANGLE and/or INTERLEAVING is present.
-- Scanning and writing .D2V file
-- Processed 215.515 frames.
-- Building .AVS and .ECL files
- Reduction Level for DVD-5: 45,8%
- Overall Bitrate : 1.250Kbs
- Space for Video : 1.315.270KB
- HIGH/LOW/AVERAGE Cell Bitrates: 2.845/1.427/1.250 Kbs
[11:28:03] Phase I, PREPARATION completed in 5 minutes.

Software used:

DVD-RB 0.66
CCE 2.67.00.27
Dgdecode.dll (also tried the older mpeg2dec3dg.dll)
Avisynth 2.55

[jdobbs]

The calculation for bitrate is exactly the same in version .66 as in earlier versions. The bitrate is dependent upon the source. The size of the original is only one fact in determining the bitrate. One original may be 4 hours long and take up 7GB while another is only 2 hours long and the same size -- the bitrate of the former would be half that of the latter.

The multiple angle portion of the disc may also have an impact. If it is exceptionally large it could take space away from the overall movie as it is not reduced in this version of DVD-RB.

[Tobytl]

There is just a large amount of ILVUs. Fairly significant portions of Alien and Aliens are seamlessly branched. I dont know about the other films, as I only set those two up to run overnight last night. It ends up with an average bitrate of ~1.7 mbps. Now even if the ILVU portion was reencoded, the bitrate would still be pretty bad at ~2.5 mbps. All told about 3 hours of video.

For an idea of just how much ILVU material there is, consider that the Aliens d2vavs folder is 1.46 GB fully encoded. With about 500 MB of untouched material. And DVD-RB rebuilds it to 4.30 GB only keeping one 448kbps AC3 stream...

Anyway, considering the video quality the first two films started out with, I'm happy enough with the rebuilt result.