SDI inputdelay

[mccatalyst]

Hello ,

we`ve upgraded our cat3.3. pro servers with sdi cards from decklink .

The delay of the input to output was up to 15 frames .

This is not really live .

Do you have any suggestions to lower the delaytime , please ?

[samsc]

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?

[Spam Butterfly]

Decklink performance should be 1-2 frame delay maximum - with NTSC or PAL.

HUGH

[samsc]

Which decklink card did you get?

[mccatalyst]

We`ve build in DeckLink Extreme.

[samsc]

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