Deep analysis and compression

[brush]

I ripped a movie which does not need any compression, in DVDSHRINK

Do I have to perform a deep analysis anyway or just choose no compression and let the process do the job ?

Does no compression keeps the movie just like it is or compress the movie just a bit ?

Thanks

[2COOL]

Originally posted by brush
I ripped a movie which does not need any compression, in DVDSHRINK

Do I have to perform a deep analysis anyway or just choose no compression and let the process do the job ?

Does no compression keeps the movie just like it is or compress the movie just a bit ?

Thanks If your movie can fit on a 4.7GB DVDR with no compression, why don't you just burn it? The only edits/changes I would do is get rid of unwanted clips prior or after movie play.

If DVD Shrink states no compression, then it should be no compression. If there is a bit, then that's a bug IMO.

[ghaynes]

I would also like to know this question, but I think Brush was thinking this:

If one is doing a movie only copy and with taking out the extras and leaving 1 audio file it comes up to fit onto 1 DVD-R with no compression is it still necessary to use the deep analysis function or just go ahead and do a quick analysis?

[brush]

Originally posted by ghaynes
I would also like to know this question, but I think Brush was thinking this:

If one is doing a movie only copy and with taking out the extras and leaving 1 audio file it comes up to fit onto 1 DVD-R with no compression is it still necessary to use the deep analysis function or just go ahead and do a quick analysis?

Yes that's it ghaynes :)

[Kedirekin]

My feeling is you don't have to do deep analysis if the ratio is 100% (or for no compression). According to what I've seen posted, deep analysis improves end quality when you're ratio is somewhere in the middle (between 100% and maximum compressibility). You can't get better quality than 100%, and you can't do better than no compression.

I can't answer the question about no compression. One would assume that it just streams the selected assets into the output without changing it, but I've seen one post here that contradicts that assumption.

[Erik_Osterholm]

Deep Analysis appears to take a more detailed look at the DVD/video and determine where compressing will be less detrimental to quality so it can determine optimal compression at the current radio. As such, if you are "compressing" at 100% (no actual compresstion) there should be no change in the output, whether or not there was a Deep Analysis performed. Using actual compression, on the high-end (say, 99%--very little compression) there will be very little difference between DA and regular analysis because you're still working with so many bits. At very low compression, you're having to get rid of so much detail that whether or not you do a DA, it's still going to artifact like crazy. That's why, I believe, DVDShrink Deep Analysis makes the most difference in the middle. But as an answer to the original question, it's just a waste of time to do a Deep Analysis if you aren't compressing at all.

[Lazza]

Yep, no need at all to carry out a deep analysis in such situation as all DVD Shrink does at the reauthor stage is copy those files direct to your chosen folder. You only need to use this when any compression is involved. Mind you it would be interesting to hear from dvdshrink as to what level of compression a deep analysis is worth doing.

I mean this.....

If a movie is only being compressed by say 10% is it really worth doing a deep analysis, will it have any worthwhile affect on the finished film? Or is it only worth doing on say 30% compression or above? :confused:

[brush]

Originally posted by Lazza
If a movie is only being compressed by say 10% is it really worth doing a deep analysis, will it have any worthwhile affect on the finished film? Or is it only worth doing on say 30% compression or above? :confused:

As far as I am concerned, I am doing DA, everytime I have to compress my movie ( even if it is 5% compressed )

Is it a good solution anyway ?

[SirCentipede]

Technically you'll allways get better results with DA (except at 100% and max. compression), but probably you won't see a big difference between normal and deep analysis when using DA at 99% or close to max. compression(see Erik_Osterholm's post).

So one has to choose if quality is an issue or time is an issue when for example you compress a movie by 10% and if you are such an quality freak to look out even for the tiniest quality differences, but quality differences there'll be for sure.

I'll allways try to stay on the safe side regarding picture quality, so I do DA on every movie (with the exceptions outlined above). With the auto-shutdown feature it's not a problem to do ripping, DA and shrinking in about 50min. and go away to do something else (go to work, eat, sleep, meet some friends etc.).