The VideoLAN Forums

Just upgraded my 'old' laptop with VLC 3.0.3
This is a laptop with dual GPU (Intel HD Graphics 4000 & nVidia Quadro K2000M) and 'Optimus' technology. nVidia driver version 390.77 & Windows 7 Pro 64bit.
I noticed that deinterlace only works with the Intel HD Graphics 4000 (laptop display only), and does NOT work with the K2000M GPU (used when external monitors are used)
With the K2000M, forcing deinterlace on interlaced SD video has no effect, no mattter the deinterlace method chosen.
This used to work just fine with the previous version on this system, i.e. 2.2.4; I have attempted a clean reinstall of 3.0.3, no improvement.

Is there a setting I should change for deinterlace to work when using the K2000M (i.e. 99% of the usage time of this laptop) ?

Hello,

Try to deactivate the hardware acceleration:
Tools -> Preferences -> Input/Codecs -> Hardware-accelerated decoding -> Set to Disable

Yes, with hardware acceleration disabled, it works fine. Who's the culprit ? It worked fine with 2.2

VLC 2.2 version hardware acceleration was disabled by default.

The culprit is probably your GPU driver, which claims that it is able to decode some codecs.

Fair enough...I have to stick to the GPU driver version certified for my video editing app
I can live with HW acceleration disabled - thanks for the tip

FYI, I am facing this problem again (deinterlacing not functioning properly, e.g. no "fluid" playback with 50i content in Bob or YADIF2x mode)
This time it is on a Microsoft Surface Pro 7, with Intel Iris Plus GPU (26.20.100.7641 driver, as updated by Microsoft Windows Update)
Observed with VLC 3.0.10 & 3.0.11 (doesn't mean the problem wasn't there with earlier versions on this GPU)
The workaround (disable VLC hardware decoding) is OK, but the result is probably less battery-friendly.

Note that the Windows 10 app "Films & TV" displays 50i content in the expected fluid way without cheating

FYI, I am facing this problem again (deinterlacing not functioning properly, e.g. no "fluid" playback with 50i content in Bob or YADIF2x mode)
This time it is on a Microsoft Surface Pro 7, with Intel Iris Plus GPU (26.20.100.7641 driver, as updated by Microsoft Windows Update)
Observed with VLC 3.0.10 & 3.0.11 (doesn't mean the problem wasn't there with earlier versions on this GPU)
The workaround (disable VLC hardware decoding) is OK, but the result is probably less battery-friendly.

Note that the Windows 10 app "Films & TV" displays 50i content in the expected fluid way without cheating

Does it work in software mode?

Yes, as said, when I disable 'tools -> Preferences -> Input/Codecs -> Hardware-accelerated decoding' it works fine (at the expense of significantly higher battery drain)

And in hardware decoder, but keeping the auto deinterlace, does it work?

in hardware decoder, but keeping the auto deinterlace, there is deinterlacing occurring but it always results in 25 fps video, no matter the method chosen. Bob and YADIF2x should yield smooth, fluid motion (during panning, etc.) with 50i material.
IOW there is no visible difference between YADIF and YADIF2x (which is not the case with hw decoding disabled, or on another computer with a nVidia GPU)

in hardware decoder, but keeping the auto deinterlace, there is deinterlacing occurring but it always results in 25 fps video, no matter the method chosen. Bob and YADIF2x should yield smooth, fluid motion (during panning, etc.) with 50i material.
IOW there is no visible difference between YADIF and YADIF2x (which is not the case with hw decoding disabled, or on another computer with a nVidia GPU)

Yes, this is something we will fix in 4.0