OK then, here is that post on facebook by Kyle Koch: VBR (variable bitrate) is used successfully on commercial DVDs but the engineers pay very close attention to increase the bitrate for complex visuals. It can be used to reduce your file size, but personally, I find it delivers poor results. From our tests, we’ve seen digital blockiness @ 10 and 15Mbps for fast motion. 20Mbps CBR is the first level that gave us solid results. You could go higher for uploads to social media but may not need to. For videos that don’t change the pixels much, like a static shot of a person talking with a plain BG, you can go much lower on the bitrate. Our vids are cut fast and with lots of motion so we tend to upload ProRes422 and 20Mbps h264. For in-term client previews (like raw interviews) we will post as low as 8Mbps.
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