Testing out a new IO Express (although it looks like it was on the shelf for a while judging by the date of the firmware) - updated to latest firmware and running v8 drivers.
Outputting SDI (with embedded audio) to Decklink SD card.
Output of 625 10 bit uncompressed captures in sync.
Output of 1080i (DVCProHD and ProRes422) downconverted to 625i result in audio that is consistenly 1 frame in advance of the pictures. I presume this is the downconvert process taking place within the IO Express box?
Any way of delaying audio to match (other than sliding it on timeline)?