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PC: Intel i7-4771 @3.5Ghz, 16 GB of RAM, Samsung SSD 840 EVO 1TB, Motherboard ASUS Z87-PRO
Graphics card: NVIDIA GTX 1070
OS: Windows 10 Enterprise 64bit (latest - Anniversary Edition)
Blackmagic hardware: DeckLink 4K Extreme 12G
- The card is brand new
- The card has an HDMI in/out mezannine card
- The card is connected to the PC power supply through the supplied power cable that goes both into the Decklink card and into the NVIDIA GTX 1070 card
- At idle the Blackmagic Design System Report for the card shows Link Width: 8x and Link Speed: 5 Gbps
Blackmagic software:- Davinci Resolve Studio 12.5 (latest version as of this writing)
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- Blackmagic Desktop Video 10.7.1 (latest version as of this writing)What I am trying to achieve: output color grading video from Davinci Resolve through the DeckLink 4k Extreme 12G HDMI output port to an external HDMI monitor
Problems I am having:
1) When I try to output video from Davinci Resolve after a reboot:
- The video plays fine on the Windows (GUI) monitor both in window mode and in full screen mode
- On the external monitor connected to the Decklink HDMI port the video plays fine for about 5-10 seconds, then the image gets corrupted in an extremely unusual way. By corrupted I mean that on top of the normal image I see a layer of grey-ish pixels. But surprisingly they are not random. The 'ghost' grey pixel layer on top of the normal image seems to be made out of repeating frames from different parts of the same clip, or sometimes they seem to be delayed frames from the same clip.
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- I have uploaded a video of this problem on YouTube: (the problem is clearly visible when watching the video at 4K resolution, so open this video fullscreen on the YouTube website using a good Internet connection)- I shot the video by pointing my phone to an Atomos Ninja Flame that was connected to the HDMI out of the Decklink. As I explain below, the external monitor type does not matter, it happens on any monitor.
2) When I play a video in Blackmagic Video Express to view it over the Decklink HDMI port vertical blue lines appear on top of the page (interrupted vertical lines of blue pixels)
- I have uploaded a YouTube video of this other related problem as well: What I tried so far:
- I tried 6 types of HDMI cables of different lengths.
- I tried multiple monitors (a UHD monitor from LG, an Atomos Ninja Flame, and some 1080 Dell monitor; my actual grading monitor is indisposed at the moment).
- I tried multple types of video files with various resolutions
- I tried almost all possible output resolutions, frame rates, 8-bit 10-bit, full vs video data levels in Davinci Resolve
- Conecting and disconnecting the HDMI cable during playback does not clear up the image 'corruption' at all. And at least in Davinci Resolve as I explained above the extra grey shadow pixels are not really random, they are very specific pixels from other frames of the video.
- All combinations experience similar kinds of 'image corruption' as explained above
Any help is appreciated.
Thanks,
Ovi