madshi bug tracker

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IDProjectCategoryView StatusDate SubmittedLast Update
0000228madVRbugpublic2014-07-21 14:402018-01-22 19:09
Assigned Tomadshi 
PlatformPCOSWin 7 SP1OS Version32-bit
Summary0000228: deintFps is not 24 for 720p60 decimated 6:4 cadence content (forced film)
DescriptionOn 720p60 content where film mode is forced and MadVR detects a 6:4 cadence for decimation the deintFps value is 60 instead of 24. With 1080i60 content in film mode where a 3:2 telecine pattern is detected deintFps is 24. IMHO, the two should be consistent and both be 24 for the purpose of using profiles.
Steps To ReproducePlay 720p60 content with 6:4 cadence and force film mode.
Additional InformationCreating ticket per your request on the doom9 forum. [^]
TagsNo tags attached.
madVR Version0.87.10
Media Player (with version info)MPC-HC 1.7.5
Splitter (with version info)LAV (intregrated)
Decoder (with version info)LAV (intregrated)
Deinterlacingforced film mode
DXVA2 Scaling Activeno
Aero / Desktop CompositionOff
Problem occurs with modeall modes
GPU ManufacturerAMD
GPU ModelRadeon HD 7790
GPU Driver Version13.12
Attached Files

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-  Notes
madshi (administrator)
2015-03-22 15:16

This is a somewhat difficult problem. Cadence detection can sometimes be unstable. It can happen that with some video tracks 6:4 is detected, then a cadence break is detected, then 6:4 is detected again, and so on. If madVR would modify the display mode, and the profiles etc everytime that happens, that could lead to desaster. So I'll need to think of a clever way to solve this. Maybe I should change the internal movie framerate estimate from 60fps <-> 24fps only if the detected cadence doesn't change for more than 5 seconds or so.

Because this is not so easy to solve, it will probably take a while until I find the time to implement a proper solution.
madshi (administrator)
2018-01-22 19:09

I've decided to simply force 24fps for 60p files if you activate forced film mode. After all, you wouldn't activate forced film mode for true 60fps files, would you? So using 24fps should be just fine.

The only problem I can see is that if the file is actually 30fps doubled to 60fps, then we will run into trouble, but I think such files are probably incredibly rare, while telecined 60fps files should be pretty common.

- Issue History
Date Modified Username Field Change
2014-07-21 14:40 Stereodude New Issue
2015-03-14 16:57 madshi Assigned To => madshi
2015-03-14 16:57 madshi Status new => assigned
2015-03-22 15:16 madshi Note Added: 0000810
2015-03-22 15:17 madshi Status assigned => acknowledged
2018-01-21 21:37 madshi Status acknowledged => assigned
2018-01-22 19:09 madshi Note Added: 0002204
2018-01-22 19:09 madshi Status assigned => closed
2018-01-22 19:09 madshi Resolution open => fixed

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