Last night I tried converting .mp4 at 848x480 with a 640kbps bitrate. It was acceptable, but when there was high motion (I encoded Planet Earth and there was a scene with a lot of birds flying), it looked awful.
I think I'll stick with a 1000kbps bitrate as there is little sacrifice in video quality from 1500, but a nice reduction in file size.
For me, at least, a 1Gb file for a movie is fine, and waiting 45 mins for it to convert is also ok.
YMMV.
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