What do these numbers next to “Frame QPs” mean under Constant Quantizer?
Constant Quantizer question
Max-H
wrote on 3/6/2019, 2:45 PM
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johnebaker
wrote on 3/6/2019, 5:13 PM
Max-H
wrote on 3/6/2019, 5:56 PM
Hi,
I read the topic you linked but it didn’t answer my question. I would like to know what the numbers next to “Frame QPs” mean.
johnebaker
wrote on 3/7/2019, 4:43 AM
Hi
They are the index values, which can be from 0 to 51, of the Quantizer matrix, that the encoder uses to determine the level of Quantization block size used to compensate for motion in the video during encoding.
The values are optimised to produce the best perceived image quality with respect to maintaining a manageable file size and retaining good motion compensation.
HTH
John EB
Max-H
wrote on 3/7/2019, 4:10 PM
Hi,
Thank you very much for taking the time to explain this to me.
So, for example, if you changed those values to 1-1-1, would that be best quality? And if you set it to 51-51-51 then it would be worst quality/best compression?
Also, are the 3 values for the 3 types of frames? i.e. I, P & B?
johnebaker
wrote on 3/8/2019, 3:02 AM