[Robert Gilbert]

If the computer were the problem, why would the clip play so well on both VLC and QT Player?

I’ve also tried lighter codecs and different settings, but all I could attain was a smooth source window playback at normal speed yet with diagonal line artefacts that don’t go away with the anti flicker.

What’s really strange to me, and which might give a clue to the problem, is that every codec and setting I tried always produces a giant oversized playback on the timeline, though it always fit fine on the source monitor.

Can anyone please advise me?

[Robert Gilbert]

OSX 10.8.5 Processor 2.8 GHz Intel Core i5 Memory 4 GB 1333 MHz DDR3 Graphics ATI Radeon HD 5750 1024 MBModel Name: iMac
Model Identifier: iMac11,3
Processor Name: Intel Core i5
Processor Speed: 2.8 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 4 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: IM112.0057.B00
SMC Version (system): 1.59f2
Serial Number (system): W80257T5DB5
Hardware UUID: C7156188-35C1-5CC6-AF55-8E3C75CB2EF1