The final verdict re: 720p vs 1080p

Since 1920x1080 is more than twice the pixel count of 1280x720, and AVCHD is a fixed length codec (21Mbps+3Mbps sound),
This is not accurate. The PH mode is 21 Mbps (VBR with peaks at 24 Mbps max.)

The audio is recorded in Dolby, 2 ch. at 384 kbps.
 
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An issue I see in this original post is that you might forget to change back to 1080 when you shoot something that does need a key! I don't think much about whether I shoot in 720 vs 1080. So I don't want to have to remember!
 
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