• Avid Media Composer

  QT file came out too large

  Posted by Avi Lev on June 10, 2015 at 9:44 pm

  I’m using Avid MC 5.0.4 on MAC v10.6.8
  I exported 1 hour doc to QT file on MPEG 4 Video. 1440 x 1080.
  The good new is that it comes out as perfect resolution, but the bad news that it is a large as 30GB.(?)
  What should I do to make it smaller, yet, keep the size as is?
  Thanks, Avi

  William Busby replied 10 years, 10 months ago 3 Members · 5 Replies
• 5 Replies

• 

  Shane Ross

  June 11, 2015 at 6:55 am

  Export for what? Meaning…what’s the intent for this export? Web? Broadcast? BluRay?

  1440×1080 is anamorphic HD…HDV generally, some flavors of AVCHD. You really want a full raster 1920×1080 export. But again…export for what?

  Shane
  Little Frog Post
  Read my blog, Little Frog in High Def
• 

  Avi Lev

  June 11, 2015 at 12:12 pm

  Thanks Shane
  I would like to screen the doc in lecture rooms. That’s why in need the highest resolution QT file.
  The scenes in the doc were shot on HDV 1440×1080.
  I guess at that point it will be too late to change the raster Dimension on the project’s format.
  But, I still want to understand how it possible to shrink the size of the exported file?
• 

  William Busby

  June 12, 2015 at 12:09 am

  the bit rate basically determines file size. For 1 hr you probably had it set for 50+ Mbit bit rate or something close. I haven’t used Avid to export anything other than QT Ref files and prefer to use AME, Rhoset or Sorenson for encoding purposes. Lower the bit rate considerably (like 8 Mbit or so) and it should still look more than presentable.
• 

  Avi Lev

  June 14, 2015 at 3:27 pm

  Thank you William.
  Here is the deal:
  Dimension: 720×480, Duration: 54:55 Codecs:MPEG4 Total bit rate:7,038
  Dimension: ” Duration: ” Codecs:H264 Total bit rate:5,831

  Dimension: 1440X1080 Duration: ” Codecs:MPEG4 Total bit rate :83,252

  Just by enlarging the dimension by approx 3 times the bit rate expends by almost 10 times.(?)

  Is there any other way to export high resolution files with less pain?

  Thanks,Avi
• 

  William Busby

  June 14, 2015 at 6:58 pm

  How are you presenting this anyway? From a DVD? Blu-Ray? A mp4 file to be played from a laptop etc?

  If a playable DVD you’re basically stuck with 720×480 to stay within DVD spec, but set a 16×9 flag so it displays properly. Set the video bit rate at 8000 kbs, audio at 192 kbps.

  If Blu-Ray, set video bit rate to 25000 kbs. If mp4/h.264 file from a computer’s hard drive, set the video bit rate from 8000-10000 kbs.

  What reason are you so concerned with the file size? What encoder are you using? This doesn’t have to be complicated.

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