i exprience some flickering in dvdshrink result.

[fibola]

lately ive been expirence some flickering in movies which i backup with dvdshrink version 3.2.0.15. now i dont know where is the problem since not all the movies have flickering and the one that does it not all the movie . when i use decryptor and dvd shrink im closing all my apps and internet downloads , maybe this version i last update do it and maybe i need to go back couple of version ?


any ideas ?


thanx

[windtrader]

This condition arises from time to time if you are compressing the movie ALOT. I think you risk getting this strobing effect.

As an experiment, do aonther run or two and compress less, maybe 80%. Look at the results. You can also try using deep analysis; this might reduce the effect.

[TheSeeker]

Also try using max sharpness. Thats what I use and I have very rarely seen this strobing effect.

[fibola]

first , as for the compressing rate i only reduce it for be enough for the disk i dont keep nothing but the movie. i compressed lord of the ring which i huge movie and there wasnt any flickering .

second what is this sharpness that i need to put to max ?



tanx.

[TheSeeker]

@fibola

First just a question are you using deep analysis? Because before you backup any movie I would always hit deep analysis button on top of dvd shrink main window.

Second, Max Sharpness is an AEC (Adaptive Error Correction) setting that you can set. WHen you hit the backup button and that window shows up. Quality should be one of the tabs in this window. If you click on this tab then you should see a checkbox to enable AEC and under that a drop down list to choose what AEC Setting to use. Choose Max Sharpness.

[fibola]

i didnt try deep A . ill try use this in my next burn . as for the AEO i didnt see where there is that option.

[TheSeeker]

You dont actually see the option to setup AEC until you hit the Backup! button on the top of shrink. Hit backup and then a popup window should appear asking for the destination and all that stuff. One of the tabs on this window is Quality. Go to that tab and check the box to use AEC.

[Gigantor69]

Instead of Maximum Sharpness you should be using Smoothness to "smooth" out flickering. That's what that option is made for.

[TheSeeker]

Wow you seem to be blessed with knowledge that even the Author of this software doesnt seem to have. As you may have noticed that he himself has said in these forums that even though he knows how the algorithms work mathematically. He isnt sure exactly when to use what setting and exactly what effect they will have on each kind of source material. Tell me how do you do it?

[Gigantor69]

What does the term Smoothness mean to you then, Seeker? I didn't just pull that info out of my ass. I had a serious problem with a scene in one disc flickering. I was told that's what the Smoothness setting was for, I redid the disc and it worked perfectly for me. What Shrink has stated is that he has written specific code to address certain issues, but for reasons he cannot explain sometimes the code meant to serve a different function may work better.

Guys like you are why I mostly lurk here. There are two threads in this section where people are having problems that I solved simply but I don't reply because of responses like yours.

[TheSeeker]

@Gigantor69

Your right... My response was totally out of line. I apologize. I dont know why I wrote it. I have just found that in my experience a setting of max sharpness has produced the best results for me, with the widest variety of movies. Your findings are equally valid however. I hope you can forgive a jackass like me and hope to see you posting more on this forum.

[dragongodz]

ok going from memory. :)

sharp settings hit B frames harder and then P frames to try and keep as much detail as possible.

smooth is actually a more even bitrate reduction across all frame types(though still scaled per type i assume) which dvdshrink(the person) said is closer to what instantcopy does.

and i even remember that there was a few people that did also get the occasional pulsing which using smooth fixed so its not an isolated case just rare.

if you want to confirm that search back through the posts on dvdshrinks forum.

[TheSeeker]

@Dragongodz

Would you say that it is a decent assumption that using a setting of say max sharp on a movie that is being compressed ALOT, say 60 percent or more, would cause some pulsing? Because the way it sounds in this case it would hit B frames really hard (because of high compression) then leave the other frames more intact which could definately cause some noticeable differences in quality from one frame to the next. Hence the pulsing. Which would lead one to believe that a good rule of thumb would be to use max sharp on movies with medium (maybe default sharp for medium) to low compression to preserve all the details and minimize pulsing. And use smooth or max smooth when alot of compression is needed? Does that seem about right?

[ddlooping]

Hi all. :)

TheSeeker, I'm affraid it's not as simple as that.

If a title is being compressed close to its maximum compressability ("Custom Ratio" >> all the way to the left), DVD Shrink will have to compress all frame types pretty heavily whatever the AEC setting chosen.

I have tried making some tests to find out a few useful rules-of-thumb, but gave up.
My method to choose an AEC setting is now as follow:

- Switch the compression setting from "Automatic" to "Custom Ratio".

- Use "Start/End" to isolate one chapter, choosing the one I think might show the most quality degradation when compressed (smoke, fire, fast action, close-ups).

- Make one backup of this chapter using "Maximum Sharpness" then another with "Maximum Smoothness".

- When done, drag these two backups to the DVD Structure pane, so as to be able to preview them in full-screen mode (F11>> Full-Screen; F12 >> Play/Stop).

- If a scene shows more compression artefact than others, I then use "start/end" to isolate it in both titles.

- I then select the two titles (using the "Ctrl" key), so as to be able to play them back to back in full-screen.

- I then decide which version look best.

- If the better looking version looks good enough, I'll backup the whole movie-title using the corresponding AEC option (or "Sharp" or "Smooth" if I think these in-between options would be a better compromise).

- If none look good enough, I'll use CCE basic.

[dragongodz]

Would you say that it is a decent assumption that using a setting of say max sharp on a movie that is being compressed ALOT, say 60 percent or more, would cause some pulsing?
as ddlooping says its not that simple unfortunatly.

throw in possible variance of B frames treatment per film compared to I and P frames. that is move A may have B frames close to P frame quants and can afford to be raised easily without too much visual difference, but movie B's Bframes may already be much larger quant than P's in which case you would be exsentuating the difference to the point its bad. :D

i have only seen it mention with some films and not the majority(ddlooping can comment if it has shown up much more on the dvdshrink forum). so using sharp is probably fine for the majority of films but there will be the occasional ones that cause pulsing or problems. in those cases you need to use smooth.

[ddlooping]

I can't really add anything, dragongodz, as no consensus has ever been reached.

The backup quality is not only highly dependent on the original title, but also on the viewing equipment used.
So some might think one AEC option is better for a particular movie, while others got opposite views.

[dragongodz]

So some might think one AEC option is better for a particular movie, while others got opposite views.
yes throw in the human factor and there will always be 2 or more sides to any story. :D