The input delay is variable, and can be as low as 2-3 frames - it seems to depend on a bit of video voodoo. and whatever else is going on in the computer.
How many layers have you got playing back whilst using video input?
Quicktime is not optimised for live input - its optimised for recording to disc - so it buffers frames -quite a few frames - if too much is going on. i have to try and get it to stop buffering frames, but its very hard to get it to do this across the range of video input cards that are available without sacrificing portability-
There is a timer settings menu - if you click on video input settings;
You will see Timer A and Timer B shown- can you switch between this and tell me if you see a difference in the delay?
Did you switch between timerA and timerB as shown above?
it might not look like much but it changes the way I try to get at video input frames before quicktime buffers them away
because it produces much more delay than Timer A
but i think there must be a small latency - this is not a broadcasttool just a visual effect -- got much more problems with ruckel-free textanimations .
The Decklink Extreme, whilst being versatile, does have a few issues:
The wiring loom causes an impedance mismatch with incoming SDI - especially long runs. If you are using the Extreme with a long SDI run, it is prudent to reclock the SDI before you stick it into the card.
Its worth checking that you have NO other software installed or running when you are running Catalysts. Some applications run daemons in the background which can detract from performance - video input perfomance is one area that can be effected.
The BlackMagic Decklink capture application that installs itself into applications when you install your decklink drivers is a useful diagnostic tool. If you shut down Catalyst and start up the capture application, it will show you what the card is seeing - which in turn is what Catalyst is seeing. A visible delay witnessed in the application means that the delay is from somewhere else. Remember that every bit of video equipment in the video chain - vision mixers, dve, routers/switchers, scan converters etc all add their own delays into the video signal.
I have tested most of the Blackmagic, Aurora Pipe cards with SDI, Composite, Y/C (where appropriate) and Component video in PAL and NTSC.
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