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Sound issues, please help!
So I’ve finally managed to get all of my RED footage transcoded from 4k 16:9 into ProRes HQ. All the clips are in FCP and playing nicely.
Now I have a major sound problem.
I used compressor to extract the aiff audio from the proxies. Everything was going fine until I brought the audio into FCP. The sync drifts, and the audio clips are slightly different lengths than the video clips. This is a major problem because some of my takes are 25 mins long.
The sync and length problems can be fixed by using fit to fill to make the audio the same length as the picture and then merging the clips (in theory I don’t even think this should work but it does), but I can’t do that because the speed is then variable and messed up when I make it into a multiclip for the other angle.
I am pretty sure that my 3.0-8 core Mac Pro with 4 gigs of RAM is perfectly capable of playing 2k ProRes HQ files and their accompanying aiff files just fine. So the drifting is not caused by bad playback, but baked into the files.
Anyone have any ideas on what I should be doing to the sound so that it comes into FCP already the same length as the picture? the picture is 24fps by the way.
Thanks in advance
~Corinne
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6 Replies
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[Corinne Pickett] “I am pretty sure that my 3.0-8 core Mac Pro with 4 gigs of RAM is perfectly capable of playing 2k ProRes HQ files and their accompanying aiff files just fine. So the drifting is not caused by bad playback, but baked into the files.”
What hard drive array are you using and what speeds are you getting on that array?
Also, what’s the frame rate of your Sequence?
Walter Biscardi, Jr.
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Is that 24.0 or 23.976?
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frame rate is 24. As far as disks, right now I’m running off a fw 800 drive, but the actual editing will be done on faster raids.
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[Corinne Pickett] “As far as disks, right now I’m running off a fw 800 drive, but the actual editing will be done on faster raids.”
Yeah, that has something to do with it, along with an improper conversion from 23.98 to 24 or vice versa. You can’t expect a fw800 drive to playback 2K ProRes files reliably. Your timeline is really @ 24.0? How are you monitoring? As a test, I’d duplicate one of your 2k files and then conform it 23.976 and see if it matches your audio.
Why didn’t you make the audio part of the 2k file? Just curious.
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Even if the playback was fast and perfect I’m pretty sure I would be having the same problem, because if I put the play head at 20 mins into a clip and hit play, the sound is already out of sync. It doesn’t start good and then drift.
The 24 vs 23.976 is a good point though. I know it was shot at 24 and my timeline is at 24. I won’t be able to test it until tomorrow, but changing the clips to 23.976 will probably work. The problem is I really can’t do that. It took 4 computers 2 weeks of working around the clock to get these clips to ProRes from the RAW files.
So what can I do to change the audio to make it work?
The audio can’t be part of the video file because RedCine, the program used to transcode, doesn’t do sound.
Thanks for your help.
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I here you that it’s baked in wrong. It has to be something in the conversion.
you can conform a movie in Cinema tools licketty split. Open in Cinema Tools, click conform, choose 23.98 and hit go. It’s that easy. I would duplicate the file first, so you have an original, but you can always conform back if you make a mistake. Conforming the clip in Cinema tools doesn’t create/add new media, it just tells what frame rate to playback. What I don’t know is if that movie will open in Cinema Tools, there’s a chance it won’t.
Jeremy
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