Catalyst Perfomance

[Gian]

We have some quad cores - with ATI 1900 ( Tiger ) and some eight cores with 8800 ( leopard ) Strangly, but the Tiger can run 4 layers of 1080p AIC and the Eight cores, 3 layers... sometimes 4.
Just as an example,... we had a event wich the movies are BLACK and WHITE, and we achived 5 layers of 1080p... so all depends on the content.

[samsc]

We have some quad cores - with ATI 1900 ( Tiger ) and some eight cores with 8800 ( leopard ) Strangly, but the Tiger can run 4 layers of 1080p AIC and the Eight cores, 3 layers... sometimes 4.
Just as an example,... we had a event wich the movies are BLACK and WHITE, and we achived 5 layers of 1080p... so all depends on the content.

10.6.x and 2009 macs are significantly faster than the ones before

the processors are hyperthreaded - meaning the cores are split in 2- and 8 cores appears as 16 processes-

and 10.6.x uses all the cores to playback movies - it splits playback properly across all available processors

even on low end 2009 machine i get 6-8 layers

[samsc]

We have some quad cores - with ATI 1900 ( Tiger ) and some eight cores with 8800 ( leopard ) Strangly, but the Tiger can run 4 layers of 1080p AIC and the Eight cores, 3 layers... sometimes 4.
Just as an example,... we had a event wich the movies are BLACK and WHITE, and we achived 5 layers of 1080p... so all depends on the content.

the jpeg algorithms used in most codecs are sensitive to data rate of the movie-

the more information in a frame - the higher the data rate - the longer it takes to decode.

black and white movies usually have lower data rates - so can be decompressed faster

each frame in a movie ( in most movie files ) has different amounts of information - and decompress time varies throughout movie playback-

so its not dependant on the weather - its dependant on the movie data rates - and this varies on the type of images.
and everyones images are different.