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59.94 to 29.97 audio sync
Hi All,
Just read all the related threads in a search; this is my first time through this and my head’s a bit dizzy trying to sort this out for my specific situation…
I have a 45 min. 1280 x 720p 59.94 in a Final Cut 6 ProRes HQ timeline, and just realized I have it set to Drop Frame. Earlier this week I dropped this edit into an SD 29.97 NTSC DV timeline, rendered, and media managed a version to an external hard drive for my post audio guy.
He just alerted me to some 1 frame gaps in the SD timeline. When he sent me an early mix, we’re a bit off sync at times, though the 2-pops match at the beginning and end. I think I now understand what’s throwing it off with the different timebases, but I’m not sure how to get us back in sync?
Also, I’ll be adding graphics, titles, etc., and not sure how this effects the above. Ultimately this will be down-converted to SD at the end for SD DVD, but there’s no broadcast/delivery specs, etc. that I need to worry about in terms of NFD/DF.
Thanks so much for any help/advice…
~Chris -
3 Replies
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i have no idea what is happening, but nevertheless:
You cut the framerate in exactly half. So no worries there, it just displays half the frames in exact the same time. No worries there.
DF and NDF do NOTHING for the total duration of the show. It’s just that the timecode is different after two minutes, that’s all.
If the syncmarks at begin and end match, you did everything right. Now i do not know how you exported, but if there is a DF / NDF mixup in the export, you should experience bigger off-sync problems on clips that are taken from the end of long ingested clips. If that is the case, you know where to look. If that is NOT the case, your audio guy messed up.
(and it can happen, i have had a very high end audio post company shifting my clips 3 frames out sync cause they thought it was better. I disagreed…)Bouke
http://www.videoToolShed.com
smart tools for video pro’s -
Hi Bourke,
Thanks for the reply, and you’re right that for the most part, we’re very close. I think (may be wrong) that when I make a cut on an odd numbered frame in my timeline, there’s no easy 1/2 equivalent in the SD timeline – does FCP create these 1 frame gaps in the SD sequence to offset this?
Not sure, but when I play his audio strip along with my original, there are times where it’s spot on, and other times where it sounds 1-3 frames off. This goes in and out of sync like this throughout, but overall it’s very close.
At this stage, I’m wondering if the best solution is to send him my audio from my HD timeline and have him listen to where they are in and out of sync, sliding his clips to match any slight offsets where they occur?
Thanks again for the reply.
~Chris -
Forgot to add, for the “export”, I just media managed the SD version of the timeline with handles and gave it to him on a hard drive as he’s on Final Cut as well (but using ProTools and/or Digital Performer for the audio mix).
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