Black Frame was still there on the first frame of the insert edit. This time I added the time code generator to the sequence so I could clearly see the output is 1 frame late getting to the record deck. The VTR in point is frame accurate just the video signal is delayed a frame, like a frame buffer would do. I tried setting the Frame offset to 1 and even 5 and nothing changed on the edits using the nitris bob or the blackmagic sdi. As I changed the frame offset parameter I made sure to adjust the deck to the normal 5500 template and then adjust back to the modified template. I even tried restarting Avid after choosing the custom machine template just to ensure that Avid was reading the updated template from scratch. Nothing changed with anything. I also tried removing the field offset 1 line above this new text but still got the same results. Curious?
---In Avid-L2@yahoogroups.com, <bogdan_grigorescu@...> wrote :
what happened to the black frame?
BG
From: "bigfish@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid-L2@yahoogroups.com
Sent: Thursday, August 7, 2014 1:11 AM
Subject: Re: [Avid-L2] Is there a new BlackMagic Desktop Video Driver that eliminates the 1 Frame offset on Digital Cut?
Tonight I had a chance to try this modification to the machine template.
In the template there already existed a line:
SBVSTARTFIELDOFFSET 1
I tried adding both SBVSTARTFRAMESOFFSET 1 and
SBVSTARTFRAMEOFFSET 1 and even tried it setting the offset to 5 but running my nitris dx nothing shifted on in point, out point or timeline sync to rec deck. All made perfect edits.
Is this a command that would only have effect when I'm using the Black Magic Card for output?
Is it possible that having the field offset line overrides this command?
In the template there already existed a line:
SBVSTARTFIELDOFFSET 1
I tried adding both SBVSTARTFRAMESOFFSET 1 and
SBVSTARTFRAMEOFFSET 1 and even tried it setting the offset to 5 but running my nitris dx nothing shifted on in point, out point or timeline sync to rec deck. All made perfect edits.
Is this a command that would only have effect when I'm using the Black Magic Card for output?
Is it possible that having the field offset line overrides this command?
---In Avid-L2@yahoogroups.com, <bogdan_grigorescu@...> wrote :
Go to: /Applications/Avid Media Composer/SupportingFiles/Machine_Templates
add the following line to the template : SBVSTARTFRAMESOFFSET 1
cheers,
BG
From: "John Moore bigfish@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid L2 <Avid-L2@yahoogroups.com>
Sent: Saturday, August 2, 2014 7:44 PM
Subject: [Avid-L2] Is there a new BlackMagic Desktop Video Driver that eliminates the 1 Frame offset on Digital Cut?
I know I've read here that there is a bug with Blackmagic's Video Desktop Driver for their cards when used with Avid. I have an SRW-5500 and after using my Nitris DX I decided to test my BlackMagic SDI card that I purchased for Resolve. It is outputting a Frame late as has been posted on this forum before. In my case I'm using a Keyspan, the older model, that is frame accurate with my Nitris DX on my MacPro 12Core OS 10.8.5 SNDX V6.5.4. Because it is outputting a frame late an insert edit starts with a frame of black. This info was mentioned in earlier threads. I have to find another vtr cable to try controlling the deck through the blackmagic card's RS-422 port to see if that is any different. I doubt it will be. I'm on BlackMagic Video Desktop 9.7.7. I will check there site to see if there are any revisions that may correct the issue.
It seems to me given this behavior it is very similar to FCP 7 with a Kona 3 and being set to Sony preset A which rolled the timeline 1 frame late. Given I'm using a Keyspan that is frame accurate with the NitrisDX but a frame late with the BlackMagic SDI card as the output I think it's logical to assume that the BlackMagic card is buffering the Avid output by a Frame. Thus the timeline is actually rolling at the right time relative to the SRW-5500 going into record the Blackmagic card is causing a 1 frame delay of the output signal so the black frame avid holds on output until it rolls the timeline is caught in the BM SDI cards frame buffer/processing when the vtr actually goes into record thereby accounting for the black frame at the insert edit point.
How can anybody work this way with Avid products. I haven't checked capture frame accuracy yet but that will be my next step. Is there any kind of offset setting like aja products offer that I could tweak this. The Avid timeline needs to roll one frame earlier to account for the video delay the BM card is causing.
I am basing this on my experience with processing delays in other devices and my tests with FCP. The frame buffering may not be the real issue but it sure acts like a frame buffering. Given the card looks like it can perhaps do cross converts etc... I would think it would have to have the whole frame into it's buffer before it could process and converted frame on output but perhaps I'm wrong on that. It just all seems like a one frame DVE delay happening like the good ole linear days only then the switcher output wasn't black before rolling.
John Moore
Barking Trout Productions
Studio City, CA
bigfish@...
Barking Trout Productions
Studio City, CA
bigfish@...
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