Dimming in video
Categories
(Core :: Audio/Video, defect)
Tracking
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People
(Reporter: sjalim, Unassigned)
Details
I've been getting weird behaviour when watching videos in Firefox that is making watching things very frustrating at times and impossible at others:
When in full screen or PIP or regular window, frequently - like once every 5 mins - the picture either fades to black or to a washed-over grey, then returns to normal, like the contrast or brightness are being auto-adjusted.
Captions and the mouse pointer remain at full intensity, so it doesn't look like it's the OS doing the dimming. Also, I don't have MacOS set to auto-control brightness.
This is in FF Release 126.0 on MacOS Ventura 13.6.7 - but it has been happening for the last month or so, roughly, including earlier FF Release versions.
This appears to be happening in at least Netflix and Disney+
I can reliably repro using:
- Disney+: Indiana Jones and the Dial of Destiny, at a point between 1h 43 and 1h44, amongst many many others
- Netflix: The 3 Body Problem, S1 E2 at 39:20-23 and others - will add a better one when I find it!
I have rebooted and it still happens.
When I try to enable logging, FF Release crashes so I can't capture a profile. Potentially relevant crash reports:
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Reporter | |
Comment 1•1 year ago
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Argh, typically, I think i have just spotted it:
In Mac OS I don't have auto-dimming applied, but I do have "Reduce motion" and "Dim flashing lights" enabled. The latter would likely explain what I'm seeing, though it's still maybe a surprise that it only affects the video frames and not the captioning layer.
So this might just be invalid - but that's a good thing!
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Updated•1 year ago
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Updated•1 year ago
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Comment 2•1 year ago
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(In reply to Steve Jalim from comment #0)
I can reliably repro using:
- Netflix: The 3 Body Problem, S1 E2 at 39:20-23 and others - will add a better one when I find it!
This is definitely a "flashing lights" sort of scene. I am not able to replicate with on my setup with the "Dim flashing lights" setting enabled, but this is certainly the sort of thing it would be designed to alter.
When I try to enable logging, FF Release crashes so I can't capture a profile. Potentially relevant crash reports:
These crash reports indicate we're crashing in the screenshot capture for the Profiler. Markus might be able to improve things here.
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Comment 3•1 year ago
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Given this is affecting only video frames and not captions, I wonder whether this is happening in a video decoder or in a graphics operation.
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Comment 4•1 year ago
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Circling back to try to avoid wasted effort, if I disable "Dim flashing lights", I can confirm the issue no longer seems to happen for me, so it was OS level.
The crashing of the profiler while DRM-protected video is running is a separate issue, and I can't speak to that.
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Comment 5•1 year ago
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Closing this bug because it was determined that it was caused by the OS "Dim flashing lights" setting.
(In reply to Brad Werth [:bradwerth] from comment #2)
When I try to enable logging, FF Release crashes so I can't capture a profile. Potentially relevant crash reports:
These crash reports indicate we're crashing in the screenshot capture for the Profiler. Markus might be able to improve things here.
Huh, I missed this. It's crashing when capturing screenshots of the video. Unchecking the "Screenshots" checkbox in about:profiling would work around this. I'm not sure if we can do anything about it other than file a bug with Apple.
Description
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