-40ms delay on Kona up and downconversion

[Ben Scott]

got the same reply about 1 frame delay on audio in downconversion using PAL from AJA

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[Christopher Tay]

Hi Ben,

The delay is on the video actually as it goes through the hardware conversion and this causes the audio to be ahead.

However I did some tests with the same clip that I saw the delay on another system and it wasn’t so apparent. I’m beginning to support it has to do with the OS,QT and FCP combo. Will do more testings.

-chrispy

[Gary Adcock]

[Ben Scott] “got the same reply about 1 frame delay on audio in downconversion using PAL from AJA “

Guys
the one frame delay is correct for the conversion, even Teranex has frame delay in the processing by 2-6 frames depending on what you are doing – the image processing needs to actually be converted and the audio is normally slewed to match it sounds as if that is not happening here.

That actual delay “timing” will vary slightly between 23.98, 24, 25, and 29.97 since the delay is always 1 frame and not a specific millisecond value.

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD

[Ramona Howard]

Gary is absolutely correct!

We added settings in Rave to handle to frame delays so that HD and SD could be in sync. This was internal coding, not a standard setting within the AJA hardware.

Cheers,
Ramona