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Exporting to Quicktime loses frames???
I just finished a very large HDV project (HDV 1080i60, shot with a Canon HV-20), about 49 minutes in length. I’m using FCP 6 with a Macbook Pro (Leopard) and when I exported it to a quicktime movie (just the regular way: File -> Export -> Quicktime Movie). I made it a self-contained file including Audio and Video, with DVD Studio Pro markers.
However, when I play the movie in quicktime, it plays perfectly fine in the beginning but towards the second-half some of the audio is not in sync with the video. I double checked this in the FCP timeline but it was perfect there so I was stuck.
I’m not sure if this helps to figure out what is wrong, but I planned on burning this to a SD-DVD with DVD Studio Pro so I exported the QT movie (before I figured out there was a problem) with the Compressor using the DVD-Best Quality 90 minutes format. Then in DVDSP I imported both files (the new movie file and audio file) and, even though they were created from the same quicktime file, the video has a duration of 49:18;05 and the audio has a duration of 49:15;06. The length of the QT movie itself is 49:18;03 which is different from both the audio and video which makes absolutely no sense to me.
I thought a simple solution would be to line up the video and audio tracks in the DVDSP timeline so I did that for one part of the file, but in another part of the clip (later on) the audio and video were still out of sync, which led me to believe that it wasn’t an issue of the audio being delayed by 2 seconds and 29 frames (the difference in time between the audio and video clips) but rather something else, such as continuously dropped frames.
Please please please help me I’ve been working on this for days. I keep experimenting but the problem is when I experiment with a 49 minute HDV movie, it takes a few hours per try.
I tried exporting with the compressor straight from FCP to the same format (which still has 8 hours until it finishes) so I will see if that works. But I should still be able to export the movie to a quicktime file without the audio and video slipping out of sync due to lost frames.
Thanks for any of your help…I’m desperate.
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5 Replies
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[Jake Honig] ” But I should still be able to export the movie to a quicktime file without the audio and video slipping out of sync due to lost frames.”
Only if the file has been fully rendered.
my guess is it is not dropping frames dropped frames in would stand out visually
-have you a mixed audio timeline? – where some parts need rendering and some do not –
make sure to do a full audio mixdown then render the project.Next time – cut in segments so that you can work on a smaller part of the project for testing.
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD -
Everything is completely rendered. The only thing I could possibly think of is that there are some gaps in video and audio (not necessarily together). If there is no slug there, could these gaps be pushed together when exporting? That might cause the out of sync problem.
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[Jake Honig] “If there is no slug there, could these gaps be pushed together when exporting? That might cause the out of sync problem.”
depending on your compression type and level, yes it can effect the output. Especially when there is nothing else in the audio tracks (like a score)
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD -
All your audio may be rendered, but make sure you highlight all audio tracks and specifically select “Mixdown”, then save. This step can make the difference if you notice synch problems or glitches in your export.
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Okay I’m not sure what the original problem was but I figured out a solution: The final timeline that was about 50 minutes long consisted of 5 different sequences. I put the sequences in the final timeline so that my final timeline didn’t have a million edits in it…it was just 5 clean sequences varying from 5 minutes to 20 minutes. Each of those sequences could be opened to reveal the edits, and one actually had ANOTHER simplified sequence in it, along with other edits.
What I did was export each of the sequences SEPARATELY to a QT Movie (as REFERENCE movies, not self-contained). When played in QT they were all perfectly in sync. Then with QT Pro I opened up a “New Movie” along with each of the 5 separate sequence movies. Then I just copied and pasted each movie into the “New Movie” and compiled the sequences in QT Pro. When I clicked save, it asked me if I wanted to make a reference movie or a self-contained one. Even though all of the 5 sequence videos were reference, I clicked self-contained, and it made the entire 50 minute video self-contained, which is a little off topic but it saved me a few hours of waiting around in FCP.
Anyway I sent this to the Compressor (DVD 90 Min Best Quality) and it did its thing for about 5 hours, but finally I was left with a video and audio file, that, when put in DVD SP, were perfectly in sync!!!!
So I guess next time I’ll just keep all the edits in one FCP sequence and see if that changes anything.
Thanks for your help everyone!!!!
-Jake Honig
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