[FFmpeg-user] How to filter VHS cassette artifacts

[Jason Coleman]

I agree with Lou, it looks like switching noise. I've historically always cropped it out of every VHS capture I ever did. I suspect you might think there's something salvagable there, and maybe there would be in the original, if you had special VCRs with the original tape, and re-did the capture. But at this point, it's already part of your video, and probably too garbled to effectively cleaned. I think most VCRs filtered it out on playback, so you really probably do have all of the usable image you probably ever had, and should just crop it.

I'd be curious if I'm way wrong here, but I'm guessing the reason no one has given you a simple way to 'fix' it besides cropping, is that at this point it's a non-trivial thing to fix.  There's no simple set some switches and it'll clean it up for you. Digital captures often showed you more of the picture then you would see on playback on VCRs of the era. It was always there, they just cropped it out because they knew it was there, anmd people would assume something was wrong if they saw it. You really aren't losing anything by cropping, you probably only ever saw the clean part of the signal in what you have now..


-----Original Message-----
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> On Behalf Of Lou Logan
Sent: Sunday, December 9, 2018 4:26 PM
To: ffmpeg-user at ffmpeg.org
Subject: Re: [FFmpeg-user] How to filter VHS cassette artifacts

On Fri, Dec 7, 2018, at 10:33 AM, Ulf Zibis wrote:
> Hi,
> 
> I have a VOB-file, originally recorded from a VHS-Kassette.
> 
> On the upper edge I see a black line from left to the middle.
> 
> Approximately 5 lines from bottom I see 2..3 other horizontally 
> shifted flickering lines.

The band of garbage on the bottom looks like head switching noise.

https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbavc.github.io%2Favaa%2Fartifacts%2Fhead_switching_noise.html&data=02%7C01%7C%7C459e23486ea0482e56a308d65e1cfcb3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636799875916584760&sdata=ao44JID%2F0L8fO9FWmvsrFXYrRela7Vk7r%2FJ%2BGAFhKAc%3D&reserved=0
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