feed SDI-in Decklink:X temp distort keyed SDI-out Decklink:Y
Posted: Sun May 07, 2017 5:41 pm
I'm having an issue with 2 inter-connected Decklink cards (SDI-out from Card X to SDI-in on Card Y) in the same machine which temporary severely interupts the SDI-output of Card Y (internal keyed SD-PAL signal) when the SDI-in on Card X is switched ON/OFF for feeding Card Y SDI-input with Card X SDI-output. Are you following me .
Its so bad that the whole frame jumps/resyncs almost in a analogue way, both video and sound are affected. All signals are same SD-pal 10bit uyvy 422 signals.
However this only happens in one direction when SDI-out of Card X is loop-feeding Card Y SDI-in with Card X its SDI-input, when swapping directions since both cards have the SAME SDI layout by (swapping cables) fixes this problem (this also requires roles to be swapped in software application). Sadly this workaround is not an option since these cards are different in audio mixing capability with internal keying and therefor the 4K Model must be at the end of the video chain/flow.
SDI Signal flow:
Card X = Decklink SDI(non-4K)
Card Y = Decklink SDI(4K)
"Card X" activate/stop SDI-in > SDI-out >> "Card Y" SDI-in >internal-keyer> SDI-out = Affected
"Card Y" activate/stop SDI-in > SDI-out >> "Card X" SDI-in >internal-keyer> SDI-out = good
Greater than sign > means feed direction, one sign ">" means internal signal flow inside a decklink card and double ">>" means the SDI loop cable between decklink cards.
It looks like the 4K model is not able to cleanly separate sync of input to output while keying?
Other people with similar experiance?
Hardware:
The setup consists of two Decklink SDI (4K) cards in the same system, notice that I'm mixing different models the 4K(pci-e 4x) and non 4K(pci-e 1x) version. This is sadly budget related. These two cards can be inter-connected in two way's, I tried both ways with SDI-out to SDI-in from one card to the other and the other way around. The good things is that only one way is affected by this distortion! The source of the SDI-in signal can be JVC cameara HDMI>SDI output or the output of SDI vbit data inserter which contains video/audio vbit vanc data.
Software:
Windows 10 prof x64 15063
CasparCG 2.07/2.10beta1(linux) controlling "internal keyer"
Melt 6.5 (mlt framework) controlling "playback of file/stream based video or SDI-in"
MediaExpress capture
Linux Ubuntu 16.04.1 4.4.x kernel
Desktop video driver 10.9
Its so bad that the whole frame jumps/resyncs almost in a analogue way, both video and sound are affected. All signals are same SD-pal 10bit uyvy 422 signals.
However this only happens in one direction when SDI-out of Card X is loop-feeding Card Y SDI-in with Card X its SDI-input, when swapping directions since both cards have the SAME SDI layout by (swapping cables) fixes this problem (this also requires roles to be swapped in software application). Sadly this workaround is not an option since these cards are different in audio mixing capability with internal keying and therefor the 4K Model must be at the end of the video chain/flow.
SDI Signal flow:
Card X = Decklink SDI(non-4K)
Card Y = Decklink SDI(4K)
"Card X" activate/stop SDI-in > SDI-out >> "Card Y" SDI-in >internal-keyer> SDI-out = Affected
"Card Y" activate/stop SDI-in > SDI-out >> "Card X" SDI-in >internal-keyer> SDI-out = good
Greater than sign > means feed direction, one sign ">" means internal signal flow inside a decklink card and double ">>" means the SDI loop cable between decklink cards.
It looks like the 4K model is not able to cleanly separate sync of input to output while keying?
Other people with similar experiance?
Hardware:
The setup consists of two Decklink SDI (4K) cards in the same system, notice that I'm mixing different models the 4K(pci-e 4x) and non 4K(pci-e 1x) version. This is sadly budget related. These two cards can be inter-connected in two way's, I tried both ways with SDI-out to SDI-in from one card to the other and the other way around. The good things is that only one way is affected by this distortion! The source of the SDI-in signal can be JVC cameara HDMI>SDI output or the output of SDI vbit data inserter which contains video/audio vbit vanc data.
Software:
Windows 10 prof x64 15063
CasparCG 2.07/2.10beta1(linux) controlling "internal keyer"
Melt 6.5 (mlt framework) controlling "playback of file/stream based video or SDI-in"
MediaExpress capture
Linux Ubuntu 16.04.1 4.4.x kernel
Desktop video driver 10.9