Mac Pro 2.66Ghz again

[mhar4]

Mac Pro 2.66Ghz, 2GB RAM, NVIDIA GeForce 7300 GT

2 pass, 640x368, deinterlaced, h.264 MPEG-4 (main profile), av. bitrate 768kbps; audio 80kbps AAC.

First pass - 61fps
Second pass - 72fps.

h.264 gives very variable encode speeds. 60-70fps is fast. Sometimes its 40-50, depending on the source. Not sure what the pattern is, though.