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synch issue on injest
it seems like my audio is 1 frame ahead of my video in fcp-
here are the details-
i am loading from a AJ-HD 1400 straight into my Blackmagic Board-(i have 2 decks and 2 diff systems and it is the same in all cases-one system is FCP 5 and one is FCP 6)
i am using a shot of someone hammering and i am stepping through the footage 1 frame at a time to track this down-
i am monitoring back out of the Blackmagic SDI port through the 1400 deck-
we are shooting 24P (w pulldown) so some of the frames are a little FUNKY due to the false frames-
ive never worried about this because i just slip the audio 1 frame back to match up-BUT am i doing something wrong?….i.e. should i have a black burst generator in the mix?….are there offsets like this in normal pro set-ups and we have to find systems to fix this (like deck menu settings)?-
like i said this has never been fatal due to my manual audio slip but maybe ive been missing something this whole time-
thanks for your input
s
Steve Beebe
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6 Replies
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If you are stepping through, then it isn’t a playback setting. Is the audio ahead or behind? Either way you should be able to adjust that in the Decklink preference panel.
Nice to have a shot with such obvious sync.
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audio is ahead….i guess my question NOW is…is this normal-i.e. does every setup have its own “quirks” and its up to us to dial them in like this?….is any offset normal or do you know if this is rare-i know in the good ole days issues like this were common and the Master Control Tech dude would track down the offset and adjust but in the desktop world is it the same situation-
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Steve Beebe
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Steve, I used to have a Decklink with FCP and I still have two in my Fairlights. I think the default setups worked but I know there is usually a preference setup that lets you correct. I recently went to Kona 3 and they have a default setup in preferences which worked right out of the box but if it was incorrect, I can adjust.
Gone are the days of having some technician from master control come and setup parameters. For better or worse, it is now our responsibility to be the creative and technical departments. Most of the COW posts are over technical rather than creative issues so I guess that tells you where our collective skills are lacking
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can you tell me exactly where the control to adjust this is?
i dont see it in the BM pref panel-
i am using the Blackmagic 1080i 59.94 easy setup for capture and all i can find is a 1 frame offset in the deck control preset window (in fcp)…i assume this is for A/V offset for TC but maybe i am wrong-
s
Steve Beebe
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A quick look at the prefs panel on the Decklink in my Fairlight sheds no detail. It’s on a windows machine so may be different to the mac drivers.
I suspect the offsets you are seeing in the device control panel in FCP are both vid & audio in relation to timecode.
It may be the timing in the deck is off. Are there any menu settings in the AJ-HD 1440 deck to adjust the timing? You are capturing both video and audio via SDI I presume.
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yes-sdi
i looked through the deck menu and didnt see anything that stuck out but half of it looks like russian so i cant tell-i do have a aja fs-1 that can do this i think
s
Steve Beebe
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