Basic Avisynth script errors?
1 Attachment(s)
Hi everybody,
Thank you for your forum, I've read a lot about VCR and TBC since I'have started my adventure to capture VHS :o I'm now using a random Sony VCR, I'm about to get a HR-7955MS (I'm based in France) So actual "test" capture are made with my random Sony VCR to Magewell Pro HDMI using RCA. Capturing 4:2:2 bt.601 (real-time compressed with Utvideo). I wanted you to know if there is any "big" error in my basic script, I dont want to be too much agressive on the process part. I not sure about where to place MatrixColor and convertion to YV12. I m getting some yellow "halo line", but its maybe the VCR ? I may need to see with the JVC. Code:
source=AviSource("test2.avi") Full scale image : https://img.super-h.fr/images/ee1b6d...ffe172418a.png |
I'd need a sample clip to run tests -- and time, and a working UPS so I could turn my system back on. :smack: :(
Post that, so others can help. Looking solely at the still clip, I see chroma noise + offset. Fix the offset Code:
ChromaShift() Colors are off. You can attempt to tackle this in Avisynth (and our color wizard sanlyn does so), but I prefer VirtualDub for something this basic (ColorMill), or Adobe Premiere for more advanced color work. QTGMC is great, but Preset="Slower" sucks. All it does is blur. Use Faster Code:
Preset="Faster" Why was this done? Code:
InputType=0, TR1=3,SLMode=2, Sharpness=0.5, SourceMatch=3, Lossless=2, MatchPreset="Slower", MatchPreset2="Slower" Sharpness is especially not great. Also, why? Code:
ColorMatrix(mode="Rec.601->Rec.709", clamp=0) Why? Code:
I'll maybe use different stuff to upscale |
1 Attachment(s)
Quote:
I see what you mean with QTGMC Slower (i use TR2 (not TR1 my mistake) to control the strength of the denoiser) but yes its too strong you are right. Using Faster is softer. Isnt converting to bt.709, as upscaling to 1080p safer ? I because I will give the output to my family which is reading the file with a random player that I dont control the settings. Thanks for the tip about Chroma shifting and Color, as I 'm still learning, I tested Code:
ColorYUV(off_u=+10, off_v=0) As far as I understand signal must be in the center. But for Chroma shifting I have trouble seeing how to setup it. Is my Chroma too much on the left ? See attachements, is the only way to detect shift is what I have outlined in red ? Left is untouched, right is Code:
ChromaShift(C=6,L=0) (Raw clip is : http://gofile.me/6HB3Z/u6n1OlSy5) |
2 Attachment(s)
Hi,
I've read the wonderful post by Sanlyn (http://www.digitalfaq.com/forum/vide...html#post58509) so I did more ChromaShifting and Color correction testing. The Chroma Shifiting is sorted I guess (as we can see on the rear right wheel and the left tree, and the shoulder on the other sample) But about color correction, I try to keep the signal on the center, maybe I dont know to use the histogram because the 'after' seem wrong to me. (I'm color blind) Shoud I try to keep the peak on the perfect center of the histogram, are juste keep the signal in the bound ? Thanks ! Attachment 12548 Attachment 12547 |
Which is which?
- The left looks better. The right is skewed colors. Neither is great. - If the right is the after, then your monitor isn't calibrated. You're correcting it badly, too blue, too magenta. Histograms are a computer seeing values. That's great and all, can be helpful, but computers are stupid. Let your eyes assist, and your eyes are the final determiner. Relying only on histograms reminds me of idiots that drive into a lake because the GPS told them so. If your eyes are green/newbie, or you actually have eyesight issues, then seek a second opinion from one of us who uses a calibrated setup. |
1 Attachment(s)
Hello,
Thanks for having a look. Left is untouched chroma / colors. Right is Chroma Shifted + color correction. As you said its too blue / magenta, its what I feel also, I may have pushed the thing to strong trying to set the signal in the center. For the Cat scene i'm using Code:
ChromaShiftSP(X=-8, Y=2) Code:
ChromaShiftSP(X=-8, Y=0) Thanks ! |
1 Attachment(s)
This will mostly be a situation of trial-and-error. Are you using AvsPmod to assist?
Also... When posting scripts, please use the CODE bbcode, which is the # symbol on the reply bar, or in "go advanced" replies. Some scripts can be messed up by forum auto-corrections of post syntax and spacing. Attachment 12554 |
No, i'm just using a script to compare left/right.
|
1 Attachment(s)
Hello again,
Random Sony RCA vs JVR HR-S7955MS S-Video (EDIT mode, B.E.S.T off, Video Stab Off, unfortunately the MS version seem to dont have TBC :( ) RAW unfiltered. Attachment 12560 |
1 Attachment(s)
Hi,
I'm doing comparison between a VHS that a lab captured into a DVD years ago (left) and mine (right) with the same VHS source. I have a overall better definition but also serious yellow/blue halo, and white border arround people. Chroma shifting as been done already (-4) and chroma denoise also, vsTemporalsmoother/ccd. What kind of artefact is it ? Can this be caused by my VCR ? Attachment 12576 |
Site design, images and content © 2002-2024 The Digital FAQ, www.digitalFAQ.com
Forum Software by vBulletin · Copyright © 2024 Jelsoft Enterprises Ltd.