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Crop/Resize - Printable Version

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Crop/Resize - serg - 30.10.2020

I'm trying to use "Hybrid" for pre-process video before up-conversion in "Topaz Enhance AI".
The procedures as follow:
- Deinterlace
- Rezise (i.e for 4x3 NTSC to 720x540 or to 960x720 or for 16x9 NTSC to 960x540)
- Filtering ...

Everything works fine.

However in many cases I need to remove borders (i.e 6px from the right) and resize cropped video back to 720x540/960x540,
preserving aspect ratio (in order to do this I need to crop top/bottom as well).
What the proper procedure and settings to do that using Hybrid's "Crop/resize"?

RE: Crop/Resize - Selur - 31.10.2020

What you should do is:
  • Understand the differences of PAR (=pixel aspect ratio) and DAR (=display aspect ratio)
  • Crop your source
  • adjust the output PAR to your needs
  • adjust the resizing to matches your needs (do not disable the automatic adjustment unless you really know what you are doing)
  • use letterbox to hit a specific resolution if need be

Cu Selur

RE: Crop/Resize - serg - 31.10.2020

Trying to follow your suggestions:
1. Even without cropping, adjusting 4x3(10/11) 720x480 NTSC to output square pixel PAR  sometimes gives 736x540
output resolution (instead of 720x540)

[Image: no_crop.jpg]

Sometimes 720x528 (instead of 720x540)

[Image: no_crop1.jpg]

2.Attempt to crop right border with auto adjust (let's say "width") doesn't  resize picture to preserve PAR

[Image: crop.jpg]

RE: Crop/Resize - Selur - 31.10.2020

Wild guess is that there is some problem with the refreshing when the input par is changed,...
Which is what you did, correct?
-> I'll try to reproduce it.

-> Yes, it's a small bug, which doesn't update the resolution when inputPAR is changed manually.

Will fix and send you a link to a dev version.

Cu Selur

RE: Crop/Resize - Selur - 31.10.2020

Send you a link to my current dev version which should fix the issue.

Cu Selur

RE: Crop/Resize - serg - 31.10.2020

New dev version gives me:

[Image: crop2.jpg]

RE: Crop/Resize - Selur - 31.10.2020

Can't reproduce that here.
What did you do step by step?

RE: Crop/Resize - Selur - 31.10.2020

Ha, I know what you did, you entered the 48 manually and Hybrid doesn't do anything for width or height >= 48 since that is the supported minimum resolution in Hybrid.
use higher values than 48 and you should be fine.

Cu Selur

RE: Crop/Resize - serg - 31.10.2020

(31.10.2020, 19:53)Selur Wrote: Ha, I know what you did, you entered the 48 manually and Hybrid doesn't do anything for width or height >= 48 since that is the supported minimum resolution in Hybrid.
use higher values than 48 and you should be fine.

Cu Selur

I did not enter 48 manually.

On every new load it behaves unpredictably.

New load gives: 720x528 instead 720x540.

[Image: crop3.jpg]

RE: Crop/Resize - Selur - 31.10.2020

Why do you think 720x528 is wrong?

To me it seem to be the correct resolution for what you configured.

Input is 720x480 with PAR 10/11 (=MPEG-4 NTSC 4:3), so output resolution with square pixel (1/1) should be 720x 480*11/10 = 720x528.

Ah,... I know why you expected 720x540 since you expected the input PAR to be 8/9 which is "Generic NTSC 4:3", if you want Hybrid to use generic enable 'Force input PAR type' and set it to 'generic', this way Hybrid should change the 10/11 to 8/9.

Further details, by default Hybrid does just take the PAR reported by MediaInfo, enforcing a specific par type Hybrid adjust the par.
See: [INFO] About pixel aspect ratios,..

Cu Selur