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Black levels / contrast change with subtitles

Hello everybody,

since the last updates of iTunes (11.1.5) + OS X (10.9.2), watching a movie with subtitles is no more comfortable. I see that other people on the forum also encountered the problem.

 

I'll try to be clear and detailed:

Each time a subtitle is displayed, the black level (or the contrast if you prefer) on the full screen slightly becomes brighter. The result is a flashing movie each time someone is speaking (subtitles). This was not present before the very last updates. This is especially very annoying when watching a movie with top/down black bars (cinema 2:1 image ratio), as there is a big area of black pixels. Or watching a story in space (try Gravity...). I would say: it is not watchable...

 

This happens (in my case) when using full screen mode, HD movie, and HDTV connected via HDMI. Maybe in other situation also, I don't know.

 

But for instance, wathching the HD version using a window (not clicking on fullscreen double arrow) on the TV, or SD version in full screen on an external monitor (which is not HDCP compatible), or SD version of the movie in full screen to the TV via HDMI, the issue is not visible. In fact the problem is not present in these situations because the contrast levels on the full screen remains brighter always, even when there is no subtitle. So there is no flashing behaviour. But the black is "not black" anymore. It is dark grey.

 

Do you know whether this is already reported to Apple dev team? Is it a known issue?

Should I report?

 

Thanks.



Having the exact same issue in iTunes only. Not in VLC, Apple DVD Player, QuickTime, or anything else. I have tried everything I can from TV settings to every conceivable iTunes/Mac OS setting, changing HDMI cables and even wiping the drive and reinstalling the OS.

 

Every time a block of type appears the entire blackpoint or gamma or contrast is drastically shifted. This is now intolerable. The entire image of the video is back and forth, pulsating dark to light with every sentence of dialogue.

 

I've also noticed it does the same thing when moving the mouse and the controller box (the box with play, ff, rewind, etc) appears too.



Me too.

 

Via HDMI, the contrast/gamma keeps changing with subtitles.

 

On a Cinema display this does not happen.

 

So apparently this only happens for

- HD content

- fullscreen

- HDMI out

- subtitles in use

 

I'll try to report this to Apple as well.



Your post made me realize something new about it only happening in fullscreen. It also made try yet again to fix it thinking about fullscreen only causing it and I think there may be a solution.

 

From within iTunes select View > Video Playback > in Seperate Window. It can still be in complete fullscreen and the flashing is gone. In fact it opens videos much faster than the way I've always done it before which was just playing in the Main iTunes window.

 

Try it out, think it's ok with this option but not 100% sure.



Testing a bit more:

 

It seems the image actually gets darker, when there are no overlays in use, like subtitles, or the control bar. When the control bar is visible, this also brightens the image, like subtitles do.

 

So seems like the "direct" streaming of video content over HDMI, without overlays, does not use the right gamma/brightness/contrast values.



same here: gamma shift only in fullscreen over hdmi - but happens in iTunes with rented or streamed movies and ALSO in Quicktimeplayer X with h264 coded non iTunes Videos.



I have a new mac mini, and i've been searching a soluton to this. Exactly the same problem here. This is ridiculous, i can play the same video with the same setup (TV and HDMI) perfectly in Windows.



Hello,

I have the same problem here....  And still looking for a permanent solution....

Hopefully someone from apple will read this post and work on that problem...



Same here. OS X 10.9.4, iTunes 11.3, and my HD rental of Snowpiercer was unwatchably dark, except when I paused the movie and the controls appeared onscreen. Then the contrast lightened up notably. Same thing happened with another HD movie purchased from iTunes, but doesn't seem to happen with earlier SD downloads. New Mac Mini hooked up to a tv via HDMI.



+1

 

I'm having the exact same problem. I'm on a Mac Mini 2012, hooked via HDMI and contrast/shadows becomes darker each time the iTunes progress OSD disappears. When the OSD is displayed the video looks like it is supposed to, with all the shadows and everything. Apple please fix this!

 

I've also tried to play around with the "Colour" in the Display settings and no-go, problem still remains.



Same issue here with the Mac Mini 2012. It's definitely an iTunes issue (that I didn't see with older versions) as subtitles on Netflix (i.e. Safari) do not cause the annoying changes of the brightness level. I already submitted a bug report to Apple via the feedback site and hope that this problem will be fixed in the next release of iTunes. Movies really become unwatchable if subtitles are switched on. Unfortunately, rented iTunes movies cannot be played with any other player than iTunes, as far as I know.



This is a terribly annoying issue. I have tried just about everything (including U-96's proposed method), but to no avail.

 

My first way of tackling this was to simply play the film in a window with a black desktop background. Unfortunately, this leaves the menu bar along the top of the screen. Since a couple of OSX-es ago, the menu bar can no longer be hidden (using any technique I know of), so this really reduces the viewing enjoyment.

 

Yesterday, I bumped across another method that reduces the visual interference: in full screen, move the control pane to the lower right corner of the monitor. A tiny portion of it remains visible. Leave the mouse pointer hovering over the pane. It won't go away until you move the mouse pointer outside the box. This leaves you permanently in the lower contrast/higher brightness "subtitles" layer with a bulky "close" box in the top left and a tiny grey square in the bottom right; and no flicker.

 

It is way less than perfect, and I am sad that this bug hasn't been fixed yet. I guess the majority of Apple's engineers enjoy their films without subtitles!



hey. yesterday i tested itunes a little. and it seems that if you chose to have english subtitles on the screen does not go in high contrast mode, i have tested with subtitles called english cc. i dont know if every movie has it. but it is a temp solution inntil it gets fixed. and sorry for my bad english. i hope you guys understand=)



Hey, been months since I looked in on this thread. I had tried absolutely everything possible to fix this and sorry to say it never was resolved until I absolutely had had enough. I wiped the drive clean of that disaster Mavericks and put Mountain Lion back on. I'm sure I don't even have to say this but - the problem is completely gone. With no adjusting of anything in any way, Mountain Lion (even up to the current version 10.8.5) just works.

 

Mavericks was the last straw for me with it's attitude of "Hey User, you're going to be using this computer the way I want you to."

 

PS - I know this is the bottom of the barrel option for help but I had to do whatever it took to get around the bright to dark, bright to dark, bright to dark, over and over again.



Same problem her on Maverick. I decided to buy a movie twice and am feeling sorrow now. The brightness blacks keep flashing and my mother who was watching too didn't like the movie at all because it was a dark movie and a lot of the scenes where invisible. No problem with VLC.

 

On my main projector I am back to Mountain Lion a long time now because even VLC plays better on ML.



最后更新:2017-09-27 08:35:46

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