madshi bug tracker

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IDProjectCategoryView StatusDate SubmittedLast Update
0000506madVRbugpublic2017-10-03 14:512018-01-21 21:27
Assigned Tomadshi 
StatusclosedResolutionunable to reproduce 
PlatformOSWindowsOS Version10
Summary0000506: black bars auto cropping does not work on side bars
DescriptionZoom control "crop bars" does seem to crop bars at top\bottom, but not on on the left

original: [^]
cropped: [^]
Steps To Reproduce1) [^]
2) [^]
TagsNo tags attached.
madVR Versionv0.92.4
Media Player (with version info)MPC-HC (64-bit) 1.7.13
Splitter (with version info)LAV (built-in)
Decoder (with version info)LAV (built-in)
DecodingDXVA2 Copyback
Deinterlacingnone (progressive)
DXVA2 Scaling Activeno
Aero / Desktop CompositionOff
Problem occurs with modeall modes
GPU ManufacturerNVidia
GPU ModelGTX 1060
GPU Driver Version376.53
Attached Filespng file icon llq8ia[1].png [^] (1,994,746 bytes) 2017-10-03 14:51

- Relationships

-  Notes
madshi (administrator)
2017-10-04 12:09

It usually works for me. However, in this specific case it seems that there's a black bar on the left side, but none on the right side, is that correct? Even so, madVR should still detect this situation, but it may take longer (several seconds), because madVR is careful not to fall for "false positive" traps, and it's rare that black bars are as unsymmetrical as they seem to be in this specific case.

Does the black bar detection still not work if you let this video run for a minute or so?
Owyn (reporter)
2017-10-05 15:06

> there's a black bar on the left side, but none on the right side, is that correct?

That is correct. I linked both original without cropping and cropped version so that should show both the source and outcome.

I left the video to run for a whole 2 hours, left bar still was there, thought it wasn't the same size for the whole movie, size varied from scene to scene (in the source, I believe madvr didn't do anything to it for the whole movie)

> it's rare that black bars are as unsymmetrical

Pretty a standart case for IMAX movies ripped from 3D source I'd say
madshi (administrator)
2017-10-05 16:04

I've seen several IMAX 2D Blu-Rays and none of them had such unsymmetrical black bars. A proper 3D Blu-Ray should not have such black bars, either.

Anyway, black bar detection should still be able to handle this situation. Can you provide me with a 2-3 minute sample of this file?
Owyn (reporter)
2017-10-05 17:19

Here's a sample [^] from the full movies page ( [^] )
madshi (administrator)
2017-10-05 17:32

I've tested the sample and black bar detection works fine for me. Can you make a screenshot of your zoom control settings?

The movie file is really weird, though, the black bars keep on changing all the time. I've never seen an IMAX encoding like this before. Hunger Games, Dark Knight, Interstellar etc all have exactly 2 aspect ratios in the whole movie, with exactly the same black bar sizes.
Owyn (reporter)
2017-10-05 20:17

> Can you make a screenshot of your zoom control settings?

I did that over my first two linked screens.
madshi (administrator)
2017-10-06 18:17

Sorry, my bad. I've now tested with exactly the same zoom control settings as those in your linked screens, and it still works more or less fine *) for me in MPC-HC. Are you sure that you're using DXVA copyback and not DXVA native or D3D11 native? Because zoom control only works with software decoding or copyback. Also, did you test with the small sample you uploaded instead of the whole file? And it still fails for you?

*) It starts out with the black bars completely removed, then switches back to show some black bars, then a couple seconds later removes the bars again completely. So it's far from perfect, but it does generally work.
Owyn (reporter)
2017-10-06 20:41

I'm sure I'm using DXVA copyback cuz bottom and top bars got cropped fine

Just tested sample file again, it seems it does work a little on some left bars... but it's barely noticable and I still see lots of black bars at left with turned on cropping,

I wish there was a more agressive method (optional?) for cropping those screen edges which are likely to get messed by random 3D black bars
madshi (administrator)
2017-10-16 10:49

I'm not really sure what I can say. It works (mostly) fine on my PC, as I said before. I would need to be able to reproduce a problem in order to improve anything.
Owyn (reporter)
2017-10-16 15:42

Try seeing whole movie? (not sure why sample doesn't show it)
Even with cropping it was rather frequent to see scenes with bars

madshi (administrator)
2018-01-14 12:10

I'd really need a sample which shows the problem clearly.
madshi (administrator)
2018-01-21 21:27

Closing this due to lack of feedback/reply. Please feel free to reopen at any time.

- Issue History
Date Modified Username Field Change
2017-10-03 14:51 Owyn New Issue
2017-10-03 14:51 Owyn File Added: llq8ia[1].png
2017-10-04 12:09 madshi Note Added: 0001817
2017-10-05 15:06 Owyn Note Added: 0001822
2017-10-05 16:04 madshi Note Added: 0001823
2017-10-05 17:19 Owyn Note Added: 0001824
2017-10-05 17:32 madshi Note Added: 0001825
2017-10-05 20:17 Owyn Note Added: 0001826
2017-10-06 18:17 madshi Note Added: 0001827
2017-10-06 20:41 Owyn Note Added: 0001835
2017-10-16 10:49 madshi Note Added: 0001852
2017-10-16 15:42 Owyn Note Added: 0001853
2018-01-14 12:10 madshi Note Added: 0002011
2018-01-14 12:10 madshi Assigned To => madshi
2018-01-14 12:10 madshi Status new => feedback
2018-01-21 21:27 madshi Note Added: 0002194
2018-01-21 21:27 madshi Status feedback => closed
2018-01-21 21:27 madshi Resolution open => unable to reproduce

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