Is 2nd pass neccessary? at DVinfo.net

Yi Fong Yu · November 8th, 2006, 07:40 AM

what's the purpose of the 2nd pass when encoding or recoding? why not just go 1pass and save tim?E

Devlyn Hukowich · November 8th, 2006, 11:27 AM

For most video that we do 1 pass encoding is fine. Where two pass becomes more critical is video with fast motion, high detail, lots of scene changes, explosions, etc... and low bit rates. If I am encoding dance recital at 9-6Mbit/sec one pass would probably be fine. At rates of 6-3Mbit/sec two pass would give a better picture during fast motion and high detail sections. And at 3-1.5Mbit/sec I might go to three or four pass to really optimize the picture.
Sometimes the time difference between one pass and two pass is non-existent, so two pass would be the better way.
Hope this helps.

November 8th, 2006, 07:40 AM	#1
Yi Fong Yu Trustee Join Date: Sep 2002 Location: Vulcan Posts: 1,564	Is 2nd pass neccessary? what's the purpose of the 2nd pass when encoding or recoding? why not just go 1pass and save tim?E __________________ bow wow wow

November 8th, 2006, 11:27 AM	#2
Devlyn Hukowich Regular Crew Join Date: Mar 2004 Location: Toronto, ON Canada Posts: 40	2nd Pass For most video that we do 1 pass encoding is fine. Where two pass becomes more critical is video with fast motion, high detail, lots of scene changes, explosions, etc... and low bit rates. If I am encoding dance recital at 9-6Mbit/sec one pass would probably be fine. At rates of 6-3Mbit/sec two pass would give a better picture during fast motion and high detail sections. And at 3-1.5Mbit/sec I might go to three or four pass to really optimize the picture. Sometimes the time difference between one pass and two pass is non-existent, so two pass would be the better way. Hope this helps. __________________ Devlyn Hukowich TwoBit Digital Inc. Video and Computer Geek P4 3.06GHz, 2GB RAM, Matrox RT.x100, dual head display