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Sorenson Squeeze compression causes sound to be not in sync with video

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Patrick Saad
Sorenson Squeeze compression causes sound to be not in sync with video
on May 23, 2008 at 3:06:57 am

Hi Everyone,

Here's my problem.

After compressing a .mov file (2GIG) using the following modified preset in Sorenson Squeeze:
.flv VP6_768K_Stream
Frame size: 640x480
Display Aspect Ration Policy: Letter Box
Drop Frames to Maintain Data Rate: 90

My resulted .flv file's audio and video, when added in a flash file as a new (Actionscript-controlled) video, is not well synchronized.
Its starts synchronized and a few seconds after, the audio is unsynchronized from the video.

This happens when I play the flash file locally, its not even on a web server yet.

If it helps understand my problem:
The original .mov file was generated from an After effects edit I made. I compressed it into a .mov file using the Add to Render Queue, using the Animation preset for the Video Format. I made sure to keep the same fps setting at Medium quality.


But again, this issue does not happen to my original .mov file.

Did anyone encounter that issue when compressing a .mov file into a VP6 flv at 768k stream ? If so, do you know of a way to compress it so that sound and video always stay in sync?

I am using a MacBook Pro 15.4inch
Sorenson Squeeze 4.5.3
Flash CS3

Would appreciate any help possible.

Thanks.

Patrick



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Robin Hamilton
Re: Sorenson Squeeze compression causes sound to be not in sync with video
on May 23, 2008 at 5:43:57 pm

I am not exactly sure, but my guess would be to disable the whole "drop frames to maintain data rate". It is probably dropping video frames while the audio continues to play.

-Robin Hamilton

Motion Graphics Designer
Visual Productions


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Patrick Saad
Re: Sorenson Squeeze compression causes sound to be not in sync with video
on May 23, 2008 at 6:59:02 pm

Hi Robin,

Thanks for your prompt reply.

I tried disabling the drop frame feature and I still have the same issue.

The following user had a similar issue as mine and it seems as if he couldn't fix it with Sorenson Squeeze, and instead used Flash video encoder... i really need to use sorenson squeeze since i don't have Adobe Flash encoder.
http://forums.creativecow.net/readpost/20/858764

Someone suggested I increase the datarate(bitrate) but that didn't solve the problem.

I am using Sorenson squeeze for mac v.4.5.3

I tried it with the latest sorenson squeeze version (trial version) with the same settings and it doesn't cause out of sync problem. That leaves me to wonder if this is a bug from the 4.5.3 version that was fixed in later versions.

Anyone has a any idea of such bug/issue with sorenson squeeze ?

Thanks.

Pat S.



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Patrick Saad
Re: Sorenson Squeeze compression causes sound to be not in sync with video
on May 23, 2008 at 7:52:31 pm

It seems the problem lies with Sorenson Squeeze 4.5.3...as I said earlier, the out of sync problem does not occur in Sorenson Squeeze 5(trial version)

I found a version of Adobe CS3 Flash Encoder and used it to compress it to 700kbs OnVP6 and it worked like a charm





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