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  • Compression Techniques

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

    Posted by Patrick Saad on May 23, 2008 at 3:06 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: 640×480
    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

    Patrick Saad replied 17 years, 12 months ago 2 Members · 3 Replies
  • 3 Replies

  • Robin Hamilton

    May 23, 2008 at 5:43 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

  • Patrick Saad

    May 23, 2008 at 6:59 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.
    https://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.

  • Patrick Saad

    May 23, 2008 at 7:52 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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