--- In Avid-L2@yahoogroups.com, "johnrobmoore" <bigfish@...> wrote:
>
> It is potentially disconcerting that different codecs might have different delays through the Intensity card anybody know if this is true?
It is possible for the codec to have an impact on the delay time. In my experience, this has not been a source of error or concern.
The facility i work at owns a Syncheck. I have used it to set the video sync offset for each of our 11 Pro Tools TDM systems. Each system uses a DeckLink card (not Intensity). When I have measured delays for ProRes and DV (not stream, .mov), the delay value is the same at a given workstation. This is true for raster sizes 480i, 575i, 1080i, 1080P, and 1080PsF for frame rates of 23.98, 25, and 29.97.
The only raster size and frame rate combination I have seen that requires a different video sync offset is 720p/23.98. The codec does not make a difference in this situation.
For any display, keep in mind that each type of input has its own latency value. So if you are using an HDMI input and measure X quarter frames, then switch to a different type of input, expect a different latency value.
If your Intensity is locked to video reference, then the QuickTime Quarter Frame Offset value will, in practice, be round to the nearest whole frame. If you enter a 15 quarter frame offset, it will actually be 16 quarter frames on playback. This is true for reference-locked video playback with Pro Tools v10 and v11. If you remove the video ref connection from your playback peripheral when using Pro Tools v11, then you actually do get quarter frame resolution with your video sync offset.
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