Noise Reduction

[GParent]

I capture VHS through a Canopus ADVC-100, which comes across looking like a DV camcorder capture. But its source is videotape and can be noisy.

I have used CCE quite a bit for backing up DVDs. In that case, I always elect to turn noise reduction off, because the DVD source usually has minimal noise.

However, VHS capture can be noisy with color, especially. So I am asking if its ok to use noise reduction with TMPGEnc? While I'm asking that question, is it also recommended with videotape source as input to CCE, too?

Thanks,

Gary

[jojo15]

Turning on noise reduction should do the trick
and for the source, it doesn't matter which source you choose, because almost all video sources are compatible..

[bernd_b]

I use avisynth together with tmpgenc and they "like" each other very well.

It has an own noise reduction filter which does a pretty good job in my opinion and has a great advantage:
It is much faster than the built in noise reduction in tmpgenc.

Maybe worth a try if speed is a matter of decision.

[GParent]

Is there a guide and/or tutorial on the noise reduction setup and use?

[jojo15]

I haven't seen one yet..

[GParent]

Before I proceed with noise reduction, I could use some feedback on the options.

I have kept the RANGE at 1 pixel. I took defaults on the other settings, too. Using the filter on, I can't see any positive diffeence with HIGH QUALITY mode. I am basing this on looking at the preview's zoomed picture differences, with and without, that option on. Also, isn't TIME AXIS dependent on frame to frame interpolation and not somthing that will show a realtime difference in the Preview window?

_____________________________________________________________________
Range
Set the size of the pixels. A large value may cause the video to look blocky.

Time Axis
Set the grade of the time difference.

This value determines how far in the along the time line the comparison frame is taken.

High quality mode
Check this box to enable "high quality" noise reduction. Enabling this option will signficantly increase encode time. One should only enable this if they have much time to spare.

Using "high quality" mode will make sure that the cleanest possible output is produced.

Enable filter
Apply the filter to the preview frame.

[jojo15]

So,
you're saying noise reduction doesn't work?

Take a look at this:
VHS 2 SVCD guide (http://members.cox.net/oehrli/main.html)
It's 2 svcd but i think it's possible to do it to dvd too,
also, choose the 2 NTSC or the 2 Pal guide, according to which you want..

[GParent]

OK, I was skeptical going it. I tried a couple clips for test purposes. I am saying that noise reduction DEFINITELY WORKS on video that is in need of improvement.

Now, I need to find the receipe that will do the best job and THAT is what I am trying to learn. Obviously, there is not a lot of information on this subject. Would you agree?

Therefore, I am trying to figure out if I should keep the pixels at 1, 2, 3 or 4. Should I adjust the time axis. That sort of thing. Playing with settings.

Obviously, some of the settings can be checked using the ZOOM mode but that seems limited. I can't seem to zoom around the image to a specific spot, for example.

One question that is not covered by TMPGEnc help, not covered by an FAQ (don't want to break any rules, et al), is about TIME AXIS. How do you figure out the best setting other than make samples and look at them. Any rules of thumb out there, based on people experimenting with these parameters.

Thanks for the positive feedback.

Gary

[jojo15]

Yes,
there's not much information, and i searched a while for the guide in my previous post, as for these two questions:
Therefore, I am trying to figure out if I should keep the pixels at 1, 2, 3 or 4. Should I adjust the time axis. That sort of thing. Playing with settings. (don't know for sure if it's a question)
One question that is not covered by TMPGEnc help, not covered by an FAQ (don't want to break any rules, et al), is about TIME AXIS. How do you figure out the best setting other than make samples and look at them. Any rules of thumb out there, based on people experimenting with these parameters.
I don't know the answer because i am not experienced in these things..
I know what pixels are, but i don't know how it's related to this,
and the time axis is something i know nothing about..
Sorry for this

[GParent]

Found this information.

http://www.dvdrhelp.com/forum/archive/t168022.html

Seems most people prefer frame serving thru Virtual Dub with the Temporal filter, OR using AVISYNTH, which I'm beginning to believe is well worth the effort to redirect my attention and just stop using the TMPGENC's own internal noise reducer.

If for nothing else, I'm half way into a 72 hour encode of a 90 minute video using:

(1) Noise Reduction On (Defaults, except for 4 pixels rather than 1 pixel). And High Quality mode is NOT SET (It would make the encode take a week.

(2) About a 4700 Kbps 2-Pass VBR.

(3) Slow Encode that is not even the highest quality.

(4) Celeron 1.4GHz processor with 512MB.

Thanks for the web site info.

[jojo15]

Let me know if it worked :D