I'm having real problems with my Decklink 4K Extreme 12G card with HDMI mezzanine. Out of 5-6 cables I've used so far (all of them sold to me as "fully HDMI 2.0 compliant"), only one is able to synchronize with my Samsung SUHD monitor when playing back an UHD@50p project (all of them are fine with 25p). But, while playing back such an UHD@50p project, I'm getting white sparks all over the screen; sometimes none, then just a few here and there - but sometimes they come up and stay permanently in a pattern like this:
I've recently bought a Shogun Inferno with what Atomos calls "absolutely the best quality" HDMI cable, which is HDMI 2.0a complaint. Unfortunately, Resolve behaves exactly like with one of those older cables: UHD@50p projects do synchronize the Decklink-monitor connection and play back full speed, but the white sparks are still there with the Atomos cable!
So I run an experiment, connecting the Shogun (instead of the Samsung monitor) with Decklink output - and the results are beyond my comprehension:
1. The old cable that synchronizes well with my Samsung (with white sparks all over the screen) will not connect with the Shogun at all!
2. One of my other cables (which doesn't even synchronize with the Samsung) does connect and plays back perfectly with the Shogun - as does the Atomos HDMI 2.0a cable. NONE of them show any hot pixels or any other artifacts on the Shogun!
So basically, I have:
3. Two cables that will synchronize with the Shogun, but only one of them will with the Samsung
4. None of them show the white sparks on the Shogun, but one of my older cables and the Atomos HDMI 2.0a cable that synchronize with the Samsung give the white artifacts...
I wrote to the BMD Support, describing the problem and asking for some suggestions as to possible reasons of the misbehavior, stressing that it might be some electrical interference with e.g. my PC's power supply (operating on the 50 Hz mains current). Here is what they answered:
"Another test you may wish to conduct is to take the HDMI output from the DeckLink 4K Extreme 12G and loop that to the HDMI input to see if this function as expected? This will help to isolate the behaviour and see if it is affected by the television/monitor, if the behaviour persists you may still want to test with another HDMI cable. This will help to further isolate this behaviour. In order to playback and capture at the same time, if you are using Media Express you may need to open two instances of the software"
As I understand it, the suggestion is to play back and capture an UHD50p clip with my Decklink, effectively excluding any monitor from the equation; I tried to do it but with an UHD50p clip loaded, Media Express just freezes!!!
I really have no idea what else I could check before sending my card in for a service, which of course I'd rather avoid... Any suggestions?
Piotr
PS. Oh, I forgot to add that - even though the above would indicate my Samsung SUHD as the source of artifacts - I did call Samsung servicemen and they replaced the "one-connect" box (basically, the entire HDMI interface) TWICE....
- interference.JPG (211.82 KiB) Viewed 8563 times
I've recently bought a Shogun Inferno with what Atomos calls "absolutely the best quality" HDMI cable, which is HDMI 2.0a complaint. Unfortunately, Resolve behaves exactly like with one of those older cables: UHD@50p projects do synchronize the Decklink-monitor connection and play back full speed, but the white sparks are still there with the Atomos cable!
So I run an experiment, connecting the Shogun (instead of the Samsung monitor) with Decklink output - and the results are beyond my comprehension:
1. The old cable that synchronizes well with my Samsung (with white sparks all over the screen) will not connect with the Shogun at all!
2. One of my other cables (which doesn't even synchronize with the Samsung) does connect and plays back perfectly with the Shogun - as does the Atomos HDMI 2.0a cable. NONE of them show any hot pixels or any other artifacts on the Shogun!
So basically, I have:
3. Two cables that will synchronize with the Shogun, but only one of them will with the Samsung
4. None of them show the white sparks on the Shogun, but one of my older cables and the Atomos HDMI 2.0a cable that synchronize with the Samsung give the white artifacts...
I wrote to the BMD Support, describing the problem and asking for some suggestions as to possible reasons of the misbehavior, stressing that it might be some electrical interference with e.g. my PC's power supply (operating on the 50 Hz mains current). Here is what they answered:
"Another test you may wish to conduct is to take the HDMI output from the DeckLink 4K Extreme 12G and loop that to the HDMI input to see if this function as expected? This will help to isolate the behaviour and see if it is affected by the television/monitor, if the behaviour persists you may still want to test with another HDMI cable. This will help to further isolate this behaviour. In order to playback and capture at the same time, if you are using Media Express you may need to open two instances of the software"
As I understand it, the suggestion is to play back and capture an UHD50p clip with my Decklink, effectively excluding any monitor from the equation; I tried to do it but with an UHD50p clip loaded, Media Express just freezes!!!
I really have no idea what else I could check before sending my card in for a service, which of course I'd rather avoid... Any suggestions?
Piotr
PS. Oh, I forgot to add that - even though the above would indicate my Samsung SUHD as the source of artifacts - I did call Samsung servicemen and they replaced the "one-connect" box (basically, the entire HDMI interface) TWICE....
AMD TR 2990WX CPU | MSI X399 CARBON AC | 64GB RAM@XMP3200 | 2x RTX 2080Ti GPU | 4x 3TB WD Black RAID0 media drive | 3x 1TB NVMe RAID0 cache drive | SSD SATA system drive | AX1600i PSU | Decklink 12G Extreme | Samsung UHD reference monitor (calibrated)