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Youtube Adding Audio Drift

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david mayer
Youtube Adding Audio Drift
on Dec 27, 2010 at 6:16:37 am

I exported an H.264 .mov file for Youtube
that is 4 minutes long using AAC audio. The Quick Time
movie itself is fine, but when streaming on Youtube
the audio is a few frames ahead at the 2 minute
point and keeps drifting steadily to about 20 frames
ahead of the video by the 4 minute point.

I tried exporting using various bitrates and audio settings, always
using the recommended AAC. Same result.

I even downloaded Youtube's .mp4 version of the movie
and when played in the Quick Time player, there is
no audio drift whatsoever. The drift only happens
while streaming on Youtube.

Any idea what is going on or a fix for it?

Thanks,
Dave

iMac 2.8 GHz Intel Core i7, 8 GB
OS 10.6.2
Final Cut Pro 7.0


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Jason Brown
Re: Youtube Adding Audio Drift
on Dec 27, 2010 at 12:23:47 pm

I'm guessing ur audio source is 48k...? Have u tried 44.1?


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david mayer
Re: Youtube Adding Audio Drift
on Dec 27, 2010 at 2:34:46 pm

yes, i tried 44.1 and got the same result

iMac 2.8 GHz Intel Core i7, 8 GB
OS 10.6.2
Final Cut Pro 7.0


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Jason Brown
Re: Youtube Adding Audio Drift
on Dec 27, 2010 at 5:57:20 pm

So what other tests have you done? Tried multiple browsers? Mobile?

How are you creating the file? Compressor? FCP? Episode?

Using a template to begin with?

-Jason


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david mayer
Re: Youtube Adding Audio Drift
on Dec 27, 2010 at 10:41:32 pm

When I make videos for Youtube that are 2 minutes or under, it's quick
and convenient to export a .mov file directly from Final Cut "Using Quick Time
Conversion". That's what I did with this 4-minute movie and I got the audio
drift.

I just tried it a new way:
1 - Export an uncompressed file using Apple Pro Res 422
2 - Use the "Youtube" settings in Compressor

And that worked.

(Still curious why AAC with both 44.1 and 48 created
audio drift - also very curious why there was no drift
in the .mp4 file that Youtube created but the drift was
there when it streamed)

iMac 2.8 GHz Intel Core i7, 8 GB
OS 10.6.2
Final Cut Pro 7.0


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Jason Brown
Re: Youtube Adding Audio Drift
on Dec 28, 2010 at 12:15:42 pm

I would stay away from "exporting" from final cut to ur final deliverable. Final cut is an editor, not a transcoding software. The fact that compressor gave u reliable results doesnt surprise me. In regards to ur other issues of lag with streaming vs download...it's YouTube...if u want more reliable and higher quality results, try something like vimeo...

Also, if ur on fcp7, u can use a "send to compressor" function. It's like creating a file and taking into compressor...but simplifies the process. And in fcp7...u can continue to edit while transcoding.


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david mayer
Re: Youtube Adding Audio Drift
on Dec 28, 2010 at 12:34:49 pm

very cool - did not know about that
send to compressor gives the same result as
exporting uncompressed and then pulling into compressor
but saves steps, right? (plus, let's you do multiple clips
at once)
Thanks, Jason.

iMac 2.8 GHz Intel Core i7, 8 GB
OS 10.6.2
Final Cut Pro 7.0


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Jason Brown
Re: Youtube Adding Audio Drift
on Dec 28, 2010 at 1:42:42 pm

Didn't mean to repost...sorry! :)

[david mayer] "send to compressor gives the same result as
exporting uncompressed and then pulling into compressor
but saves steps, right?"


Yes. I'm just a user, but I believe it is basically like creating a QT reference file...but doing it in a temp area that you never have to deal with interim files.

I use it routinely and love it. Before v7...that function would tie up FCP while it sent the file to compressor. But in v7 it now does it in the background.

Note that you do take a small performance hit while continuing to edit...because the media is being used by 2 applications. But it's minor IMHO.

What's great, is that you can send multiple sequences to compressor (and combine them as one video if you want)...and then add multiple output modules to each video...so you can create a WMV, h264 and vp6 (through episode plug-in)...all at the same time in the background while you continue to edit on that sequence.

It's a very clean workflow.

-Jason


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Jason Brown
Re: Youtube Adding Audio Drift
on Dec 28, 2010 at 1:33:32 pm

I would stay away from "exporting" from final cut to ur final deliverable. Final cut is an editor, not a transcoding software. The fact that compressor gave u reliable results doesnt surprise me. In regards to ur other issues of lag with streaming vs download...it's YouTube...if u want more reliable and higher quality results, try something like vimeo...

Also, if ur on fcp7, u can use a "send to compressor" function. It's like creating a file and taking into compressor...but simplifies the process. And in fcp7...u can continue to edit while transcoding.


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