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audio skipping and mismatch

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Hassan Ibrahim
audio skipping and mismatch
on Jan 1, 2013 at 8:20:14 pm

hi.
i have a video shot on a mobile in mp4. it plays allright on mobile or pc (using vlc player or any other player). problem is when i import this video in after effects, audio gets mismatched. it skipps randomly. the problem is in both ram preview and output.. as can be seen in screen shot given below, there is no audio in last minute or so of the video. in the part where there is audio, it is mismatched and skips randomly...
same problem occurs with many other videos, on another pc i work with and after effects cs5 and cs6 both. im new to after effects and this problem is making it hard to work with it... please help somebody..
thanks



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Angelo Lorenzo
Re: audio skipping and mismatch
on Jan 1, 2013 at 8:38:21 pm

A lot of cell phone codecs are variable frame rate which aren't suitable for editing. I would suggest using VLC to convert the video to a constant frame rate (Something like MOV/M-JPEG so it doesn't lose much quality) to see if that fixes the issue.

--------------------
Angelo Lorenzo

Need to encode ProRes on your Windows PC?
Introducing ProRes Helper, an awesome little app that makes it possible
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks


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Vishesh Arora
Re: audio skipping and mismatch
on Jan 1, 2013 at 10:39:07 pm

I am with Angelo this time.

Convert the .mp4 file to .mov with PNG codec wich is almost lossless using Adobe Media Encoder.

http://www.larryjordan.biz/ame-cs6-overview/

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

Demo Reel(3D):







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Angelo Lorenzo
Re: audio skipping and mismatch
on Jan 2, 2013 at 12:53:48 am

Adobe Media Encoder is worth a try, but I hear from the Adobe Forums that it may not convert properly.

--------------------
Angelo Lorenzo

Need to encode ProRes on your Windows PC?
Introducing ProRes Helper, an awesome little app that makes it possible
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks


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Todd Kopriva
Re: audio skipping and mismatch
on Jan 2, 2013 at 5:54:33 am

> .mov with PNG codec wich is almost lossless


Why do you say "almost"? The PNG codec is entirely lossless at the highest quality setting.

---------------------------------------------------------------------------------------------------------
Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
---------------------------------------------------------------------------------------------------------


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Vishesh Arora
Re: audio skipping and mismatch
on Jan 2, 2013 at 6:59:59 am

Todd

I was not exactly sure about it as I have read in some articles that PNG codec 95% lossless. Thanks for clearing my doubt. I will keep that in mind.

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

Demo Reel(3D):







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Hassan Ibrahim
Re: audio skipping and mismatch
on Jan 2, 2013 at 7:16:43 am

im sorry but im new to adobe after effects and dont really know how to use media center. any tuotorial about that would be great help. thanks


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Vishesh Arora
Re: audio skipping and mismatch
on Jan 2, 2013 at 8:11:51 am

Hassan

Adobe Media Encoder

http://www.adobe.com/devnet/flash/quickstart/video_encoder.html
http://www.larryjordan.biz/ame-cs6-overview/

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

Demo Reel(3D):







Return to posts index

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