DVD Shrink Compression Levels

[ghaynes]

I just want to get an idea from everybody using the new DVD Shrink beta 3 or 4 what compression levels people are using that still produces a quality picture when using the deep analysis.

Mainly now with the deep analysis I don't know how much compression I can put on a film before I start seeing low quality and macro blocking. I see people compressing movies from 65% down to 50% and was wondering if the quality is still great.

The question really is how much more compression can I do using deep analysis over quick analysis?

Thanks in advance ;)

[SirCentipede]

My personal rule of thumb on DVDshrink 3.0 is 65% for the main movie, as at this level the results are still good in my eyes (for example with DVDsrhink 2.3 my personal threshhold was 75%)
...but as allways it depends on what you expect and which kind of movie you r doing.

On slower scenes and movies you might go even lower, on fast-paced action-scenes i would recommend higher percentages for the main movie.

BTW as far as i can remember Mr. DVDshrink said in another thread (http://forum.doom9.org/showthread.php?s=&threadid=59171) that deep analysis can't lower the compression ratio and you'll get better results at lower compression with deep analysis than with quick analysis.

dvdshrink:
DVD Shrink 3.0 at maximum compression will output more or less identical results to version 2.3. Its the in-between ratios, where there is some leeway about from where to actually gain the compression, which should be improved by deep analysis.

As I understood it, it's like the higher the compression the more deep analysis and quick analysis don't differ that much.

[ghaynes]

As I understood it, it's like the higher the compression the more deep analysis and quick analysis don't differ that much.

So what your saying is that if I do a movie only copy which has a compression of 90% to 100% (No compression) that I don't need to bother with the deep analysis? If so that could save me alot of time since I have been using the deep analysis for every movie.

[SirCentipede]

Aaarggh... i really find it confusing (maybe because I'm not a native speaker):confused: :confused: :confused:

If one says high compression ratios, it means a lower percentage of the original movie (which is shown in DVDshrink) and if one says lower compression ratios, it means you get a higher percentage of the original movie.

Actually i really don't know exactly how deep analysis works in DVDshrink 3.0. So i can't say when it is better to turn it off.

I do deep analysis all the time with each movie.

But as far as i understood Mr. dvdshrink, if you compresse a movie with the highest compression ratio possible (for example 50% of the original movie) there is not much what deep analysis can do to improve the picture quality anymore, so maybe there is no difference between deep and quick analysis.

Picture improvements by deep analysis should be more visible at compression ratios between maximum compression and no compression at all (for example 50%-99% of the original movie). What i conclude from this is that I think that deep analysis produces better pictures if you don't compress the original movie too much.

[DonBerg]

The problem is what is called compression level % is now really "quality" level %. 100% is highest quality for example, no extra compression. In older versions of DVDshrink what was called compression level was 0% for no compression and was named correctly. When it was inverted (new compression %)=100-(old compression %)
the name should have been changed to quality level, its not exactly a size % either.

I think DVDshrink is best for DVDs that have a movie that has big extra audio streams you can eliminate and extras you can reduce to get the movie alone with one DD5.1 audio track at 70& or higher quality. If you need to go below 60-65% because that isn't the case, its better to split it to two DVDRs in my opinion.