usefullness of 'analysis' on dvdshrink

I am just wondering if the 'analysis' feature of dvdshrink will give a noticeably better picture, is its use worthwhile?

This should really be in the one-click forums.

Yes, deep analysis will significantly improve the picture, especially if your compression ratio is in the middling area - less so near no compression or near maximum compression.

Thank you for the response, and sorry I missed this forum. Anyhow, so for items that are being compressed down to 60%, the option will not help much? I am backing up EVERY buffy the vampire slayer disc.

Can you roughly describe around what percentages you would use it on? 70-90%?

Originally posted by Louse76 Anyhow, so for items that are being compressed down to 60%, the option will not help much?

The opposite would be true.

ie - using Deep Analysis will give a better final picture as opposed to NOT doing the analysis. The more you are compresing the video, the more you need the Deep Analysis.

Deep Analysis typically takes only 30-40 minutes to complete and is worth the time IMO. Unless you were backing up a large number of DVD's everyday, then 30-40 minutes is nothing.

How quot;goodquot; the result is from your Buffy depends alot on the quality of the source.  Many episodic TV discs cram a full 8GB onto one disc so even DVDShrink may struggle to give you a good result.

Bottom line is to experiment for yourself and burn to RW DVD's and see how the different methods compare using your equipment and your eyes.

Cheers...

Grover is right - typically you want to do deep analysis at 60%, and the quality of the results is strongly dependent on the source.

Maximum compression is not any fixed ratio - it's when the ratio slider is all the way to the left.  On most DVDs, maximum compression is down around 40%.  DVDShrink (the author of the software) has stated that deep analysis doesn't have much benefit at maximum compression.  For myself, I almost always do deep analysis - it's fast enough that I don't even bother to ask the question 'should I do deep analysis on this?'  About the only time I don't use it is when I'm doing No Compression.  I think the new versions even disable deep analysis if you're doing No Compression or 100%.

I've occasionally had good results all the way down to 55%, but that is pretty uncommon.  Above 80% you'll almost always get good results, but even that isn't gospel.  I'd recommend at anything below 80% you should check the results in a software player, and be prepared to redo it.  AS buffy is TV footage (I'm pretty sure they didn't use film cameras), I'd be surprised if you get good results below 75%.  And Buffy is one of those exceptions that, even above 80%, I'd check the results in a software player before burning it to a DVDR.

Originally posted by Kedirekin
AS buffy is TV footage (I'm pretty sure they didn't use film cameras), I'd be surprised if you get good results below 75%.  And Buffy is one of those exceptions that, even above 80%, I'd check the results in a software player before burning it to a DVDR.

Actually, Buffy The Vampire Slayer was filmed, not taped.

The first and second seasons were shot on 16mm film, and have a very grainy appearance.

Third season and later were shot on 35mm film.