• Compression Techniques

  MPEG4 VBR – Custom VBR settings – Finding a middle ground

  Posted by Mark Grieco on March 2, 2011 at 2:23 pm

  Hello,

  I’ve been trying to find a middle ground for bit rate for a MPEG4 compression between the Medium VBR and High VBR setting.

  I’m compressing a sequence from FCP 7 to Compressor 3.5.

  When I compress using the Medium VBR bit rate the compressed video typically has a rate around 4.5 – 5 mbits/second. File size: 385mb

  Compressing the same video using High VBR setting comes out around 20mbits/second. File size: 1.87 gb.

  A huge difference is size and quality.

  I need to find a middle ground. When I try to set the custom bit rate in the encoder pane I can only max out on just over 2mbits on the bit rate slider and it won’t let me enter a specific above 2mb/sec in the bit rate field.

  How can I get this video compressed using the MPEG4 setting to around 10mbits/second?

  i appreciate your help.

  Mark

  Jeff Greenberg replied 15 years, 6 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Jeff Greenberg

  March 2, 2011 at 6:02 pm

  Don’t use the ‘quality’ settings. Set the data rate by hand.  Oh wait, you have. Yeah, Compressor is a pain for such stuff.

  You can do this via a QuickTime Movie setting, go to settings and choose MPEG4 or h.264 (mpeg4, part 10) and have a QuickTime Movie that’s in the mpeg 4 or h.264 codec at whatever data rate you want. Problem: it’s technically a QuickTime MOVie.

  Alternatively, you can create a true h.264 file by choosing any of the h.264 options (Apple devices, Blu-Ray and for DVDSP) and have more freedom with data rates.

  Best,

  Jeff G

  Apple Master Trainer
  Avid Cert. Instructor DS/MC
  Avid & Color Videos Vasst.com
  Compressor Essentials Lynda.com

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