Latest post Tue, Mar 1 2011 7:07 PM by MichaelP. 1 replies.
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  • Tue, Mar 1 2011 2:46 AM

    • mschneider
    • Not Ranked
    • Joined on Thu, Oct 13 2005
    • PostWorks, New York
    • Posts 38
    • Points 470

    Read Audio Timecode Counting

    All -

    New bump with the Read Audio Timecode function in Media Composer. We are seeing this in Media Composer Mac 5.0.3.7 and 5.0.3.8.

    Good news - exception errors and applications vaporizing in versions prior to 5.0.3.6 have been fixed (this is a documented fix of 5.0.3.6). Bad news - counting the TC, though functional, is counting incorrectly, though close enough to make it a subtle error.

    ARRI ALEXA shoot, all video speed acquisition: 23.98 picture chain, 23.98 TC for audio on a Zaxcome Deva 5, music is being played back on set from a ProTools rig, also at 23.98 TC. The ProTools rig music and TC are being sent to Channels 5 (music) and 6 (TC) on the Deva 5. Channel 6 Deva BWF is being read using the Read Audio TC function.

    Counting error is close enough to be logical (i.e. not some wild number): for example the music starts at 01:03:55:00, but is read by Avid on Channel 6 as 01:03:32:00. Does not seem to be numerically a .1% discrepency. The Deva 5's Start TC is being read correctly upon import so no problems there.

    How do we know it's wrong? Other than the fact that we have the msuic file's BWF TC as a comparison point, we played back the Deva 5 audio in a Fostex DV824 to a hardware distripalyzer and when exposing the TC using that method, it agrees with the music file's TC. The Aux TC created by the Read Audio TC function is so far the odd man out.

    And the other point of comparision: Same file works fine in Composer 4.0.5.x and agrees with both the distripalyzer and the original music file's TC.

    Same problem in 5.0.3.7 and .8. Anyone else seen this?

    Thank you.

    Matthew Schneider Director of Technology PostWorks, New York 100 Avenue of the Americas, 10th Floor New York, NY 10013 212.894.4000 (work) 347.672.4192 (cell) mscheider@postworks.com

  • Tue, Mar 1 2011 7:07 PM In reply to

    • MichaelP
    • Top 50 Contributor
    • Joined on Thu, Oct 13 2005
    • Boston
    • Posts 2,444
    • Points 30,415
    • Avid Certified Instructors - Video
      Avid Employee
      Moderator: Film
      Moderator: MetaFuze

    Re: Read Audio Timecode Counting

    Hey Matt -

    I just got an email from the west coast with a similar issue on Read Audio Timecode. I will ask QA to look into it.

    Michael

     

    24p.com

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