Deinterlacing VHS

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Deinterlacing VHS

Noeck
Hi,

I have digitized VHS video recordings on my computer. The Video is
originally recorded in a PAL system (interlaced). I would like to
improve the video quality with some filters. Cropping and color
correction is clear.

But deinterlacing is hard, as the lines of the half-images are not
exactly one pixel apart because the resolution is not identical with the
analogue resolution on tape. The framerate should be like on tape. yadif
does improve things a bit.

Is this just an ill-posed problem or are there special settings to
achieve a good deinterlacing in this case?

Are there any other recommendation how to improve visually percieved
quality for typical VHS videos?

Cheers,
Daniel
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Re: Deinterlacing VHS

Marton Balint


On Tue, 12 May 2020, Noeck wrote:

> Hi,
>
> I have digitized VHS video recordings on my computer. The Video is
> originally recorded in a PAL system (interlaced). I would like to
> improve the video quality with some filters. Cropping and color
> correction is clear.
>
> But deinterlacing is hard, as the lines of the half-images are not
> exactly one pixel apart because the resolution is not identical with the
> analogue resolution on tape. The framerate should be like on tape. yadif
> does improve things a bit.
>
> Is this just an ill-posed problem or are there special settings to
> achieve a good deinterlacing in this case?

If your source VHS is OK, and VHS is smooth on TV then you probably made a
mistake during digitalizing your content and some unintended conversion or
scaling happended there. You should re-digialize your content keeping the
original PAL resolution, and encoding using lossless or interlaced
encoder. Otherwise it is doubtful that you can really improve it later.

Regards,
Marton
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Re: Deinterlacing VHS

Kieran O Leary
In reply to this post by Noeck
Hi

On Tue 12 May 2020, 18:01 Noeck, <[hidden email]> wrote:

> Hi,
>
> I have digitized VHS video recordings on my computer. The Video is
> originally recorded in a PAL system (interlaced). I would like to
> improve the video quality with some filters. Cropping and color
> correction is clear.
>
> But deinterlacing is hard, as the lines of the half-images are not
> exactly one pixel apart because the resolution is not identical with the
> analogue resolution on tape. The framerate should be like on tape. yadif
> does improve things a bit.
>

I'd love to see a pic or video of what you describe. As Marton said, sounds
like a digitisation issue that you've introduced.

Best,

Kieran O'Leary
Irish Film Institute
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Re: Deinterlacing VHS

FFmpeg-users mailing list
In reply to this post by Noeck
What resolution, codec, frame rate, etc did you capture to?

Jay


> On May 12, 2020, at 11:56 AM, Noeck <[hidden email]> wrote:
>
> Hi,
>
> I have digitized VHS video recordings on my computer. The Video is
> originally recorded in a PAL system (interlaced). I would like to
> improve the video quality with some filters. Cropping and color
> correction is clear.
>
> But deinterlacing is hard, as the lines of the half-images are not
> exactly one pixel apart because the resolution is not identical with the
> analogue resolution on tape. The framerate should be like on tape. yadif
> does improve things a bit.
>
> Is this just an ill-posed problem or are there special settings to
> achieve a good deinterlacing in this case?
>
> Are there any other recommendation how to improve visually percieved
> quality for typical VHS videos?
>
> Cheers,
> Daniel
> _______________________________________________
> ffmpeg-user mailing list
> [hidden email]
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [hidden email] with subject "unsubscribe".

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Re: Deinterlacing VHS

Carl Zwanzig

Was the the original capture compressed at all?

Digitizing, especially from VHS, is a challenge. Best is to take the YC
output from the deck, push it through a TBC/proc-amp into the capture
device, and record that with no compression. If a TBC isn't available, at
least don't compress the capture. Sure, you end up with a HUGE file, but
then you can repeatedly post-process to find what looks the best.

OTOH, if recapturing isn't an option, the OP may be stuck.

z!
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