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http://trailers.divx.com/Fox/ThankYouForSmoking_HD.zip [1280*544 px]
It used 15% of my Pentium 4 2.66 GHz, when decoding using FFDSHOW without any post-processing functions turned on. This is normal.
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http://trailers.divx.com/Dreamworks/SharkTale_HD.zip [1280*688 px]
Used 22% of my Pentium 4 2.66 GHz.
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http://trailers.divx.com/Dreamworks/Madagascar_HD.zip [1280*720 px]
Used 22% of my Pentium 4 2.66 GHz.
The video format was DivX 5 (DX50) for all clips.
Look for Post Processing in your decoder (Options -> Filters) and turn them off. What filter are you using for decoding? I didn't use any SSE/SSE2 optimizations or GPU assistance (except scaling), so your comp is most likely able to keep up too.
BSPlayer automatically zoomed out as the res was greater than my desktop currently set. But this happens in hardware even using old i740, so shouldn't be a problem.
AVI is a container format, which carries one or more video and audio streams, which themselves are in one format or another. The container format has little influence on the processor time needed for decoding. Deinterlace is a solution how to fix legacy video where each frame contained 2 fields, taken at different time moments (not needed here).
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Strange that the required CPU on that page is as fast as 2.4 GHz. What does that DivXPlayer they are offering do... Really post-processing – creating data which doesn't exist in the file... :?
The player installer is 15 MB :o. Bloatware.