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WAV sound on a 23.976fps video

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Chee Wee TanWAV sound on a 23.976fps video
by on Mar 6, 2012 at 5:48:11 am

Hi audio pro people, I have a problem.

I am from PAL country but this crew shot 23.976 rushes for me and using external recorder for audio.

When I placed the audio on the timeline with video, it synced at first but then it slowly started to drift out-of-sync.

Is there such things as 23.976 audio?! How do I convert the WAV audio to drop-frames to match the video? I did try convert video to 25P but it doesn't work.

Thanks very much.

Ps. Using a mac, so pc solution is probably out, although I heard about BeSweet.

Budget always not enuff.
http://www.dogbonepost.com


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Eric TolineRe: WAV sound on a 23.976fps video
by on Mar 6, 2012 at 1:31:41 pm

I'm not sure this will work but try Pluraleyes from Singular software. http://www.singularsoftware.com.

Eric


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Chee Wee TanRe: WAV sound on a 23.976fps video
by on Mar 6, 2012 at 1:41:17 pm

Pluraleyes is not syncing only, I doubt it is for changing frame rates, if there is such things as frame rates for audio.

Budget always not enuff.
http://www.dogbonepost.com


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Peter GroomRe: WAV sound on a 23.976fps video
by on Mar 6, 2012 at 5:13:54 pm

IF the audio was recorded to timecode sync then yes it will be at the 23xx fr. But if its just a wild recording then its hours mins secs and tenths / 100ths, not base 25 or base 24 etc etc.
if you play audio at the wrong speed youll hear it stright away.
what are you using to re unite the pics and audio. make sure the sample rate and bit depths ate correctly matched 1st. this will cause drift.
Peter

Post Production Dubbing Mixer


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Chee Wee TanRe: WAV sound on a 23.976fps video
by on Mar 6, 2012 at 6:09:46 pm

Thanks for the piece of information. Learn something new today, and yes, I think they recorded wild with no external sync to anything.

I am using FCP 7 to sync the visual and audio. So far it ain't working at whatever I throw at in.

Lucky for me, only certain part of the visual requires matching, the rest can be cutaways, so I'll just have to manually sync 2-3 secs of visual that were used.

Budget always not enuff.
http://www.dogbonepost.com


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Ty FordRe: WAV sound on a 23.976fps video
by on Mar 6, 2012 at 6:31:27 pm

Hello Chee Wee Tan and welcome to the Cow Audio Forum.

Try Wave Agent on copies of the original files.

http://sounddevices.com/download/waveagent.html

Open a COPY of the file in Wave Agent and change the frame rate. Please let us know if that does the trick.

Thanks,

Ty Ford
Audio Forum Leader


Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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Chee Wee TanRe: WAV sound on a 23.976fps video
by on Mar 7, 2012 at 2:21:29 am

Yes! I tried one WAV file, imported it in, change the frame rate and save it and it synced perfectly without drifting! Thanks for the solution!

On a side note, one of the WAVE file can't be imported at all.

Thanks a lot for this solution again!! Cheers!

Budget always not enuff.
http://www.dogbonepost.com


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Ty FordRe: WAV sound on a 23.976fps video
by on Mar 7, 2012 at 2:37:41 am

Chee Wee Tan,

Excellent. Glad I could help. Thanks for letting us know.

Does anything open that other file?

Regards,

Ty Ford
Audio Forum Leader


Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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Chee Wee TanRe: WAV sound on a 23.976fps video
by on Mar 7, 2012 at 2:55:14 am

I used Quicktime 7, open that particular file, export it again as a same WAV file and then it can be open with Wave Agent for changing for frame rates.

Must be something corrupted somewhere in the recording.

Budget always not enuff.
http://www.dogbonepost.com


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Ty FordRe: WAV sound on a 23.976fps video
by on Mar 7, 2012 at 3:39:38 am

Chee Wee Tan,

or, there's something in the meta data that's not cooperating.

Regards,

Ty Ford
Audio Forum Leader


Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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Bouke VahlRe: WAV sound on a 23.976fps video
by on Mar 8, 2012 at 7:50:25 am

Doh, here we go again...

BWF DOES NOT have a framerate, nor does it have timecode!
BWF contains timestamps, and with that you (or your software) can calculate any TC you want.
TC 00:00:01:00 is described in BWF as 48000 (assuming you recorded 48Khz...)

Now most recorders start on a round number of seconds. (Meaning, a multiple of 48000 samples)
Thus if you don't slow down / speed up the sound, the outcome of Pal, 24 or NTSC (df) tc is always the same.

Now you can flag the file to be slightly faster / slower than 48000 (typically 48048) to make files compatible between true 24 and video 29.976.
This has nothing to do with the actual speed it was recorded, just 4 bytes are changed describing how many samples per second the file is. By 'misintepreting' this number, the sound speeds up / slows down without quality losss (at the cost of a .1 % pitch change)

Now to alter those parameters, indeed Wave Agent is the way to go.
As for syncing in FCP, if the start is good and the file drifts out of sync, you got a wrong setup. FCP interprets the BWF based on the last choosen setup. So pick the correct setup for a new project (you don't have to actually USE that project), QUIT fcp, open it again and import your BWF.

Bouke

http://www.videotoolshed.com/
smart tools for video pros


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