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tvOS testing 2.8.1 (161208.1909)

Old TestFlight threads
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davilla
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Re: tvOS testing 2.8.1 (161202.1549)

Post by davilla » 03 Dec 2016, 16:25

timstephens24 wrote:Normal black bars you get when you're watching a 2.40:1 video on a 1.78:1 screen.
are these embedded black bars, see video size in log to tell.

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timstephens24
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Re: tvOS testing 2.8.1 (161202.1549)

Post by timstephens24 » 03 Dec 2016, 17:10

No they're not, the video size is 1916x794. This is a file downloaded from iTunes (21 Jump Street) with the DRM removed (losslessly) so they theoretically should be exactly the same.

three6zerocool
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Re: tvOS testing 2.8.1 (161202.1549)

Post by three6zerocool » 04 Dec 2016, 09:04

When a video is playing, press enter to access gui controls.
Scroll across to movie reel icon, scroll down the preferences until you see brightness and contrast.
Adjust accordingly, and then scroll down further and select 'set as default for all media'

Ideally you would want to play some reference test patterns to set the levels correctly against.
Ie. The AVCHD709 patterns I mentioned in another post.

MrMC will then use those saved preferences for all playback.

three6zerocool
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Re: tvOS testing 2.8.1 (161202.1549)

Post by three6zerocool » 04 Dec 2016, 09:16

If someone has a place here to upload them to.
I can upload the Basic Patterns that support both standard and full range black (brightness) and white (contrast) levels. The patterns are MP4, and are about 100MB.

All I do is place the patterns somewhere where MrMC can access media, and then just play em as desired, access the gui controls, brightness, contrast....save as default. Bam....done.

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timstephens24
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Re: tvOS testing 2.8.1 (161202.1549)

Post by timstephens24 » 04 Dec 2016, 20:32

You don't need to upload them for me, thanks though. I have a lot of test patterns and test videos ;)

Did a little more testing... if I turn off VideoToolBox, it's correct, but if I turn on VideoToolBox it's wrong.

cosmoxl
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Joined: 12 Dec 2015, 14:16

Re: tvOS testing 2.8.1 (161202.1549)

Post by cosmoxl » 04 Dec 2016, 21:36

Here's what I've gathered using the mp4 versions of the 709 test patterns.

Fire TV 4k, which outputs RGB 4:4:4 8bit (at 1080p, no 4k tv here yet) playback in MrMC I get limited low and high end.

Roku Ultra via Plex app - yCbCr 4:4:4 8bit - I get full highlight levels but limited shadow levels.

Apple TV 4 - yCbCr 4:4:4 8bit - I get full range in MrMc testflight with full range and VTB enabled.

I get limited range both highlights and shadows with full range disabled and VTB enabled.

I get limited range both highlights and shadows with full ranged enabled and VTB disabled.

I get full range both highlights and shadows with full range disabled and VTB disabled.

Apple TV 4 - yCbCr 4:4:4 8bit - with Air Video HD, I get full highlight levels but limited shadow levels.

Oppo BDP93 - yCbCr 4:4:4 12bit - I get full highlight levels but limited shadow levels.

It does seem that there's still something wrong with VTB and levels - the same problem timstephens reports. with VTB off I can finally get real blacks. With VTB enabled and full range disabled I get the limited range flashing as expected but the whole background is gray, not black.

Also, it seems like proper handling in MrMC for limited levels should be to have full highlights but limited shadows like Air Video HD, the Roku Ultra, and the Oppo BDP.

That also explains why Apple call it RGB low - it has the full highlights anyway, RGB low adds full shadows.
Last edited by cosmoxl on 04 Dec 2016, 22:01, edited 1 time in total.

cosmoxl
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Joined: 12 Dec 2015, 14:16

Re: tvOS testing 2.8.1 (161202.1549)

Post by cosmoxl » 04 Dec 2016, 22:15

just another finding...

I can make VTB enabled video look like I think it should for my TV - limited shadow levels, full highlight levels - by lowering the brightness of MrMC to 44 and keeping contrast at 50. This way I can still use VTB but get proper blacks.

However, this causes a problem for live tv which doesn't use VTB, making everything appear too dark.

To make ffmpeg decoding look like other apps on the apple tv I have to set brightness to 51 and contrast to 45.

cosmoxl
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Re: tvOS testing 2.8.1 (161202.1549)

Post by cosmoxl » 06 Dec 2016, 20:54

I installed the previous release and compared VTB and ff at the default 50/50 brightness and contrast in MrMC.

Both codecs give limited levels for highlights and shadows.

VTB in that release doesn't have the problem of black being gray like the testflight does.

cosmoxl
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Re: tvOS testing 2.8.1 (161202.1549)

Post by cosmoxl » 07 Dec 2016, 14:56

davilla, have you been on a coding frenzy due to OCD trying to get HEVC support on the apple tv? you're awfully quite the last couple days. :D

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davilla
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Re: tvOS testing 2.8.1 (161202.1549)

Post by davilla » 07 Dec 2016, 17:56

RealLife(tm) is intruding :)

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