Aliasing in picture-in-picture
Categories
(Core :: Audio/Video: Playback, enhancement)
Tracking
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People
(Reporter: linus.kardell, Unassigned)
Details
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:95.0) Gecko/20100101 Firefox/95.0
Steps to reproduce:
Open a video in picture-in-picture. This is on OpenSUSE Tumbleweed with KDE Plasma
Actual results:
The video suffers from severe aliasing, it looks like it uses basic nearest-neighbor downscaling.
Expected results:
Use a better downscaling filter, such as Lanczos, Mitchell or area-average.
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Comment 1•4 years ago
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The Bugbug bot thinks this bug should belong to the 'Toolkit::Video/Audio Controls' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.
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Comment 2•3 years ago
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Apologies for the long wait before we got to this one; we're trying now to clean up our backlog for video controls.
As far as I can tell, this is still a problem. I don't see anything that I'd personally describe as severe, but it does appear that we're using nearest-neighbor; I manually scaled down a screenshot of a video using nearest-neighbor and I got an identical image to the content of our PIP window, but if I use one of the suggested algorithms in my manual scaling then I do get a visibly smoother image.
This bug does not appear to reproduce on Windows, I see quite a different (and I think nicer) looking image there.
My choice of testing method probably reveals how much I understand about how any of this really works, which is nothing. But I really don't think there's anything happening here that's specific to PIP, I think we just happen to be a spot where downscaling video is common. So I'm going to redirect this, hopefully to someone who knows what to look for.
Description
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