Thus setting higher bits_per_mb limit will improve the speed. If the frame contains lots of small details it’s harder to compress it and encoder spends more time in search for appropriate quantisers for each slice. not producing frames with size bigger than defined) while still making output picture as good as possible. In default mode of operation encoder has to honour frame constraints (i.e. vendor - one can put custom vendor ID into frame like apl0 to claim it was produced by Apple encoder.Default value of eight should be good for almost all situations though. mbs_per_slice - how many macroblocks are there in slice, 1-8.bits_per_mb - how many bits to give for coding one macroblock, different profiles use from 200 bits per macroblock to 2400, one can set it up to 8000.There’s also default matrix which should give the highest quality (it’s default in the sense that when quantisation matrix is not provided in frame decoder defaults to this one). If you don’t specify it, the matrix will be picked from default profile (or use auto to be really sure). quant_mat - selects quantisation matrix from one of profiles ( proxy, lt, standard or hq).profile - selects ProRes profile to encode ( proxy, lt, standard or hq).In case someone is interested here is the list of possible options: And from what I gather it even has one user (not me). Some people wanted to have ProRes encoder in Libav so I wrote one.
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