• Adobe Premiere Pro

  h.264 encoder (in cs3) produces really bad aliasing from AVI MJpeg source

  Posted by Jason Mongue on May 24, 2009 at 9:22 pm

  I have many 640×480 mjpg avi files from a Canon Powershot camera that I put in a 640×360 project. I keep the vids at 100% scale and just leave them cropped top and bottom.

  What I find interesting is that when I encode my project out using h.264 (keeping the same 640×360, square pixels, ridiculously high bitrates, etc etc) I great really terrible aliasing. If I use MPEG2 (with basically the same settings, though obviously much lower bitrate), it looks fantastic and quite similar to my original videos.

  Can anyone enlighten me as to why this is? Is there some secret setting in h.264 that I’m missing?

  My project settings are:

  Timebase: 30.00 frames/second
  Frame size: 640×360
  Pixel Aspect Ratio: Square Pixels (1.0
  Fields: No Fields (Progressive Scan)

  The AVI files show these properties in Premiere:

  Type: AVI Movie
  File Size: 50.4 MB
  Image Size: 640 x 480
  Pixel Depth: 640
  Frame Rate: 30.00
  Source Audio Format: 11024 Hz – 8 bit – Mono
  Project Audio Format: 48000 Hz – 32 bit floating point – Mono
  Total Duration: 00:00:28:05
  Average Data Rate: 1.8 MB / second
  Pixel Aspect Ratio: 1.0

  Jason Mongue replied 16 years, 11 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Terry Kampowski

  May 25, 2009 at 11:21 am

  I’ve never had any luck using Adobe’s CS3 h264 conversion.
  I use Quick Time Pro – it does a great job.
• 

  Jason Mongue

  May 25, 2009 at 8:34 pm

  Thanks for the suggestion!

  Sure enough, I tried (same settings) using QuickTime (selecting h.264 codec) and the results are excellent. No appreciable increase in aliasing at all.

  Thanks!

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