[Libav-user] how to set mjpeg encoding quality programmatically?
donmoir at comcast.net
Thu Jun 9 11:16:05 CEST 2016
>Hi, searching the mail list and seems I found the answer.
>Just need to set
>AVCodecContext.flags |= CODEC_FLAG_QSCALE
>and AVCodecContext.global_quality = qscale * FF_QP2LAMBDA, in my case
qscale = 3
>Please correct me if anything wrong, thanks
I had a question regarding setting the bit_rate to adjust quality. This
works but fuzzy on how best to set the bit_rate.
I tried what you did and that works but it produces an excessively large
file with a large bit_rate using QSCALE. I mean way to large bit_rate.
So there is more to the story. I am testing with 1920x1080 live
recording. Using the bit_rate only I am able to control quality and file
size better than I can currently using QSCALE but again sort of fuzzy
logic on how best to set the bit_rate.
I am still experimenting with it.
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