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Author Topic: ROHQ Doesn't Play This Clip Right, ROST Does  (Read 1894 times)

glynor

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ROHQ Doesn't Play This Clip Right, ROST Does
« on: March 29, 2015, 09:11:02 am »

This is one for Hendrik.  If you play the following sample clip using ROHQ mode, the colors are all crazy.  ROST plays it properly.  Trimming it in VideoReDo had no impact, so it probably isn't a muxing error.  I'd guess there is something broken or oddball about the encoding in the video, but I have a few of them like this, and ROST plays them fine, so I figured it was worth reporting with a sample.

http://glynor.com/files/test_files/s01e01-Arrival_Sample.mp4

Code: [Select]
Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 4 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 13s 640ms
Bit rate mode                            : Variable
Bit rate                                 : 1 795 Kbps
Maximum bit rate                         : 40.0 Mbps
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.078
Stream size                              : 2.92 MiB (82%)
Matrix coefficients                      : YCgCo
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glynor

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Re: ROHQ Doesn't Play This Clip Right, ROST Does
« Reply #1 on: March 29, 2015, 09:15:29 am »

ROHQ:


ROST:
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6233638

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Re: ROHQ Doesn't Play This Clip Right, ROST Does
« Reply #2 on: March 29, 2015, 11:16:42 am »

Add [matrix=709] to the end of the file name to fix this.
 
It's a bad encode as the file is tagged as YCgCo, which EVR does not support. (thus it is treated as BT.709 in RO Standard)
 
If you don't want to tag the file, the default shortcut to change matrix is CTRL+ALT+SHIFT+M
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Hendrik

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Re: ROHQ Doesn't Play This Clip Right, ROST Does
« Reply #3 on: March 29, 2015, 11:31:24 am »

Odd thing to actually have a YCgCo tag in the file when it actually isn't encoded like that. But yeah, nothing automatic that can be done about that.
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glynor

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Re: ROHQ Doesn't Play This Clip Right, ROST Does
« Reply #4 on: March 29, 2015, 11:38:43 am »

Cool.  Makes sense.  Thanks guys.
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6233638

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Re: ROHQ Doesn't Play This Clip Right, ROST Does
« Reply #5 on: March 29, 2015, 12:10:53 pm »

What I will say is that it's nice that madVR can fix this sort of thing easily via tags. (or on-the-fly)
I don't think I've ever run into that specific problem myself, but it's really easy to fix things like level problems in videos which is something that I've run into.
I've even got a few commercial Blu-ray releases which were encoded incorrectly, so that the levels were way off spec. (source levels, fixed levels)
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