Excessive CPU usage during playback

[eltomassito]

On processor Core i3 2.3GHz CPU usage during playback 720p video is 100% on both cores. Why?
In 2.5 version I could change to half or quarter video size and it helped to playback, but in 2.6 it's impossible to change video size.

[mean]

What video output are using ?
If openGL works for you, you will see a huge decrease on cpu usage
(same for Xv or vdpau on linux)

[eltomassito]

No matter. I've changed every available option in Preferences and Video Decoder menu.

[Jan Gruuthuse]

Used operating system, 32/64-bit, avidemux revision nÃ,° and source (download?)

Here running on core I3-2500K a 720p mpeg-ts from german fta dvb-s:

core 1: 25%
core 2: 48%
  vcpu1: 10% (hyperthread/virtual cpu)
  vcpu2:  7% (hyperthread/virtual cpu)
total cpu for avidemux qt4: 14.81%

[eltomassito]

Avidemux 2.6 utilizes 2x more CPU then version 2.5

[Jan Gruuthuse]

Doing what? What is your used OS (32/64-bit). Used hardware. Did show in my previous message that avidemux  v2.6.0 (r8198) is using 14% while playing 720p content.
Claiming it uses 2x more CPU: is saying nothing nor helping finding possible issue.
Give details please.