I am totally on the other side, I only use average bitrate. It can produce better quality video for the same file size (or same quality, but smaller size).can anyone illuminate why video toolbox / hardware encoding doesn't permit constant quality? average bitrate files are usually much larger codec for codec than constant quality as it can upshift and downshift bitrate depending on pixel shift activity.. ie busier scenes with more original pixels vs images where little changes ?
Average bitrate is really "average", the encoder will assign more bitrate on the more demanding scenes. And this is the key to keep better video quality with the same file size.
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Exactly as per my screen capture. Do NOT alter anything (except bitrate). As simple as tick the "Allow frame reordering" box can fallback to software encode.
P.S. I don't mind to send you my setting, but I am not with my cMP right now, I can only remote access the screen captured before.