Perian 1.2 Darkens TV Shows

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auctoris
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Perian 1.2 Darkens TV Shows

Postby auctoris » Tue Jan 12, 2010 11:04 pm

The Short Version: After installing Perian 1.2, all of my TV shows appear much darker and more saturated. I assume it has something to do with this line from the release notes:
Video tracks now have their colorspace set based on the size of the video.

The Longer Version: I have Perian 1.2 installed on a G5 (PPC) running OS X 10.5.8. It is connected to a calibrated LCD HD TV. I am playing mkv files encoded with X.264 and AAC audio. When I play TV shows (30-60 min programs, 720p, 500MB-1GB) using Front Row or Quicktime, they are dark, muddy, and over saturated. When I play those same videos in VLC, they look fine.

But, the problem doesn't seem to affect movies. All of the movies (>60 min, 720p,>1GB) I have tested look fine.

If I revert to the previous version of Perian, it looks fine. When I reinstall Perian 1.2, the problem comes back.

Any ideas?

Thanks

--
Brett

Perian 1.2
Mac OS X 10.5.8
Power Mac G5 Dual 2 GHz/3.5 GB RAM
42-in Toshiba Regza HD LCD TV (calibrated)

Mr VacBob
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Re: Perian 1.2 Darkens TV Shows

Postby Mr VacBob » Fri Jan 15, 2010 2:15 am

VLC doesn't do color-corrected rendering, so it will certainly look different from QT on 10.6 (which is correct), randomly, depending on whether the video card drivers felt like treating your video as HD or not. Um, but I can't say what QT on 10.5 does, but I doubt they'd get it too wrong.

This only happens for movies with height > 576, right?

Oh, if you can save a file as .mov (Save As -> reference is fine), I can tell you if I think it's correct or not. But you might prefer it incorrect.
Last edited by Mr VacBob on Thu Jul 21, 2011 6:08 am, edited 1 time in total.

auctoris
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Re: Perian 1.2 Darkens TV Shows

Postby auctoris » Fri Jan 15, 2010 3:13 am

Thanks for looking into this.

I need to make a correction to my first post where I said tv shows were dark but movies looked okay. The movies I tested were actually m4v and mov files and they did look okay. However, mkv movies are too dark. So it is all mkv files that are too dark--not just tv shows.

And I don't know whether this has any bearing on it, but I have my G5 set to use a gamma of 2.2 (same as the Snow Leopard default).

All the mkv files I've tested do have a height greater than 576. They are mostly 720.

If I save an mkv as an mov, it "fixes" the problem. It looks normal.

Below I have included the specs of one of the files that appears too dark.

--
Brett


Code: Select all

*** General Parameters ***
- Container: Matroska
- Creation Date: 2009-10-20 3:00:46 AM
- Size: 559.1 MiB
- Duration: 0:20:45
- Bitrate: 3 769 Kbps
- Encoding Library: libebml v0.7.7 + libmatroska v0.8.1
- Encoding Application: mkvmerge v2.3.0 ('Freak U') built on Oct 7 2008 20:39:59

*** Video Track Parameters ***
- Format: H.264/MPEG-4 AVC
- Size: 491 MiB (88%)
- FourCC: avc1
- Track number(s): 0
- Bitrate: Max.: Undefined
   Average: 3 310 Kbps
   Min.: Undefined
- Frame rate (fps): Max.: Undefined
   Average: 23.976
   Min.: Undefined
- Bitrate mode: Undefined
- Encoding profile: High@L3.1
- Resolution: 24 bits
- Width (Pixel number): 1280
- Height (Pixel number): 720
- Pixel Aspect Ratio: 1:1
- Display aspect ratio: 16:9
- Chroma subsampling format: YUV420p
- TV standard: Undefined
- Interlacing: Progressive
- Encoding library: x264 core 68 r1184tw
- Additional Parameters: CABAC: Yes
   Reference Frames: 3
   Bits/(Pixel*Frame) ratio: 0.150
   Muxing mode: Unknown@3.1

*** Audio Track(s) Parameters ***
- Format: AC3-A52
- Size: 57.0 MiB (10%)
- FourCC: 0x2000
- Number(s) and language(s): 1: Undefined
- Details: -
- Profile: Undefined
- Bitrate: 384 Kbps
- Bitrate mode: Constant
- Resolution: Undefined
- Rate: 48.0 KHz
- Channel(s): 5:1 - 6 channels
- Position: Front: L C R, Surround: L R, LFE

mmirza
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Re: Perian 1.2 Darkens TV Shows

Postby mmirza » Sat Jul 09, 2011 6:01 am

Sorry to bring up an old thread, but I seem to be having the same problem. In my case saving the .mkv as a .mov through quicktime doesn't fix it.

Just wondering if anyone has a solution? or if anybody else is having the same issues still?

mmirza
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Re: Perian 1.2 Darkens TV Shows

Postby mmirza » Sun Jul 17, 2011 8:47 am

Anyone??

I really don't get how this issue is being overlooked, it makes .mkvs basically unwatchable.

Here's a side-by-side comparison (left is quicktime with perian): http://cl.ly/8Voq

Mr VacBob
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Re: Perian 1.2 Darkens TV Shows

Postby Mr VacBob » Thu Jul 21, 2011 6:09 am

The left side is too bright, not too dark. That seems to be a different problem than was originally mentioned.

Please post a sample from the mkv file (using the dd command from http://libav.org/bugreports.html).


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