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Capture Device: Blackmagic WDM Capture (Intensity Pro 4K) displays color channels in reverse order (BGR instead of RGB)

Posted: 21 May 2023 11:32
by Lollie
Hi all.

Image

I have a Blackmagic "Intensity Pro 4K" PCIe card. I'm trying to simply display it via "Open Capture Deviceā€¦" using the device "Blackmagic WDM Capture", but it displays with colors in reverse order: Blue / Green / Red.

I've tried using different ":dshow-chroma=" options, but according to the Messages log, the only chroma mode that the device supports is "RGBA". I also have "Decklink Video/Audio Capture" devices listed, but they don't return any video or audio streams.

The complete Messages log generated while opening the Capture Device stream is available here: https://pastebin.com/XEmW0aBN

OS: Windows 11 Pro, 64-bit
VLC: 3.0.18 Vetinari

I was hoping that a video filter could fix this, but unfortunately I see no way to remap color channels.

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(as a small aside: When saving a screenshot of this device via VLC, the screenshot is vertically flipped, [see here]. It only appears flipped in the screenshot, the stream itself appears in the correct orientation.)

Re: Capture Device: Blackmagic WDM Capture (Intensity Pro 4K) displays color channels in reverse order (BGR instead of R

Posted: 22 May 2023 10:47
by Lotesdelere

Re: Capture Device: Blackmagic WDM Capture (Intensity Pro 4K) displays color channels in reverse order (BGR instead of R

Posted: 22 May 2023 19:00
by Lollie
No - this one is an output plug-in, it sends video to the Intensity Pro 4K. I would need an input plug-in, or a video filter if one exists.

Re: Capture Device: Blackmagic WDM Capture (Intensity Pro 4K) displays color channels in reverse order (BGR instead of R

Posted: 23 May 2023 15:27
by Lotesdelere
You should create a new report ticket on the VLC issues tracker with your above report and the link to this thread:
https://code.videolan.org/videolan/vlc/-/issues

Re: Capture Device: Blackmagic WDM Capture (Intensity Pro 4K) displays color channels in reverse order (BGR instead of R

Posted: 23 May 2023 18:31
by Lollie
Sure, done:
https://code.videolan.org/videolan/vlc/-/issues/28169

I've also taken the chance to request a new video filter, Color Channel Remap
https://code.videolan.org/videolan/vlc/-/issues/28170