1080i output out of sync

[David Roth weiss]

[Jeremy Garchow] “You know David Roth Weiss noticed that too. DVCProHD50 is not a format so it must be a reporting error on the AJA side.

ProRes should be 10bit playout. “

Jeremy has superb memory, because I did indeed discover this very strange “anomaly.” I am not certain exactly what the heck that DVCProHD 50 thing really means, but I’m hoping it is just a bad reporting error, and not an indication that the Kona cards are for some reason outputting a strange signal that is half the resolution of DVDProHD.

David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los Angeles

POST-PRODUCTION WITHOUT THE USUAL INSANITY ™

A forum host of Creative COW’s Apple Final Cut Pro, Business & Marketing, and Indie Film & Documentary forums.

[Gary Adcock]

[David Roth Weiss] “I am not certain exactly what the heck that DVCProHD 50 thing really means, but I’m hoping it is just a bad reporting error, and not an indication that the Kona cards are for some reason outputting a strange signal that is half the resolution of DVDProHD.”

If I remember correctly – in Davids case it was on a early Intel or G5 machine, just within the playback specs, running current OS and FCP versions.

Because of the scalar nature of ProRes, in a machine that is at or near the minimum playback spec, FCP is confused in thinking that data it is receiving is something other than ProRes {what is this new fangled stuff} and due to the data rate it picks the closest codec that is a compressed HD codec,
Because you converted from some version of a Thin Raster Codec and the aspect ratio is the same as DVCPROHD- so the computer reports to FCP,which tells the Kona card that reports that a 50Mb/s version is being played back not the expected 100Mb/s version.

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

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Inside look at the IoHD
https://library.creativecow.net/articles/adcock_gary/AJAIOHD.php

[David Roth weiss]

[gary adcock] ” FCP is confused in thinking that data it is receiving is something other than ProRes {what is this new fangled stuff} and due to the data rate it picks the closest codec that is a compressed HD codec,”

Well, I’m glad FCP is as confused about this as I am…

THNX,
David

David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los Angeles

POST-PRODUCTION WITHOUT THE USUAL INSANITY ™

A forum host of Creative COW’s Apple Final Cut Pro, Business & Marketing, and Indie Film & Documentary forums.

[Michael Gissing]

I can see two problems with your setup. Firstly you should monitor both picture & sound via the Kona. There is a 4 frame offset in playback which means the sound coming straight from the mac will not be in sync with the picture via the Kona.

Secondly, if I understand your description you are using your system drive (single internal 7200) to playback ProRes. If it is your system drive, then this is a big no no. If it is a separate drive, have you run the speed test to see if the drive is up to spec?

[Brian Leighty]

No it’s a standalone drive and is able to keep up. I am going to try using the KONA audio instead and I believe that should fix the audio sync issue. I believe I figured out the other part of the problem though, I started with Kona card in slot 4 then tried slot 3 when I switched it to slot 2 the problem went away except for the audio being out of sync which will probably be fixed with using the Kona audio. I also noticed about 20% reduction in CPU usage when playing back a Prores clip. Not sure what caused it just glad it worked.