• AJA Video Systems

  Kona Data Rate Question

  Posted by Scott Shucher on December 22, 2007 at 6:28 pm

  Is there a difference in data rate if I capture DVCProHD via SDI using my Kona versus the Firewire port? Shouldn’t it be approx 100mbit/sec. either way??

  I captured a bunch of footage via DVCProHD 720/30p footage via firewire, and it’s data rate reads 59/mbits per second. I would have expected around 100mbits/second.

  G5 2.5ghz DP, 2.5Gbyte RAM, FCP 6.0.2, OSX.4.11
  QT7.3, Kona2 (v4.0) w/Kbox, Atto UL3D, Medea RTRX640, Huge MV 1.8Tbyte, Radeon 9800XT

  Scott Shucher replied 18 years, 4 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Shane Ross

  December 23, 2007 at 7:41 am

  [Scott Shucher] “s there a difference in data rate if I capture DVCProHD via SDI using my Kona versus the Firewire port?”

  Nope.

  [Scott Shucher] “Shouldn’t it be approx 100mbit/sec. either way??”

  Yup.

  [Scott Shucher] “I captured a bunch of footage via DVCProHD 720/30p footage via firewire, and it’s data rate reads 59/mbits per second. I would have expected around 100mbits/second.”

  if you captured 720p60…59.94fps, then you’d be at 100mbps. 30p, 29.97…is half that. 24p…23.98, is under a third of that. 100mbps is based on the 720p60 format, which is what DVCPRO HD runs at on tape. When you capture it at 29.97, you are removing frames and thus lowering the data rate.

  Shane

  
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• 

  Scott Shucher

  December 24, 2007 at 2:41 pm

  That makes perfect sense! Thanks Shane.

  Happy Holidays,

  Scott

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