Straighten a screener shot at an angle

[bruno321]

I've a file that comes from a recording where the camera was directed at a screen, but at an angle. How can I fix that?

Snippet: https://www.sendspace.com/file/df8sev

Additionally, it'd be great if I could get rid of those horizontal bands moving vertically, this typical artifact of shooting a screen. Is it possible to fix it?

Thanks!

[wonkey_monkey]

I was going to suggest Warp/Quad (https://forum.doom9.org/showthread.php?p=1862853), probably Warp because of the curve to the screen. Then I checked and discovered it has some bugs. But at least this:

quad(31,58, 888,14, 1048, 676, -30,750, swap = true)


will give a rough correction. That missing corner's going to be problematic though.

[bruno321]

Thanks for looking into it. I tried using quad, but the only working link I found was this one https://forum.doom9.org/showpost.php?p=1602709&postcount=22 which is a 32bit plugin. Is there a 64bit version?

[wonkey_monkey]

Warp (https://forum.doom9.org/showthread.php?p=1862853) contains a newer version of Quad.

[bruno321]

Thanks. But I just get a black screen all over the video, i.e. it "works" (no error) but I just get a pitch black image. I'm using LWLibavvideosource("source.mkv"), then your quad line. What am I doing wrong?

[wonkey_monkey]

I probably need to recompile it because of all the bugs. Try this though:

quad(0,0, 31,58, width,0, 888,14, width,height, 1048, 676, 0,height, -30,750, interleaved = true, swap = true)

I can't download the clip at the moment. If it doesn't work properly, try changing swap to false.

[bruno321]

Works like a charm. Thanks again :)