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H264 to MPEG-2 - very different transcode times

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Raven Plenty
H264 to MPEG-2 - very different transcode times
on Sep 25, 2008 at 4:36:50 pm

I have two different H.264 quicktime movies that vary widely in their processing times to convert to MPEG-2 using Compressor (DVD Best Quality 4:3).

Source 1 - 20-minute video (DVD sourced live action video, extracted using Handbrake), 640x480, 2000 kb/s - about 8 hours conversion time (video only, no audio)
Source 2 - 2-minute video (animation sequence created in Combustion, 30 fps), 1280x1024, 4700 kb/s - about 6 minutes conversion time (video only)

Extrapolating the 2 minute video to a 20 minute video puts it up to about 1 hour conversion time. I would have thought it would take longer to convert the 1280x1024 video. Any insights into why there's such a huge difference in conversion times?

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