VMAF scores for tuning your encoder.

[ronaldod]

For tuning the encoding it would be nice if the encoder supports VMAF. It will take more time but it will tell how good the encoder settings are. It is a tool from netflix. It compares the before and after video and tell you how much distortion is between it. Like 0 is totally crap to 100 is like same as input.

Example results on cards:

taken from youtube eposvox

[akhilleusuggo]

Hello back @ronaldod , I did some testing , and yeh this is a great tool from Netflix . My question is how can we make use of it on the script ?

Most users has only software encoding ( x264 ) , going with preset veryfast , since the different in take and time_encode/quality_results is not scaling as expected .

Another reach is 2-pass encoding . The only usefulness I see for this script is for admins only . Where on the video dashboard , we could add an array with statements from 0 to 100 for debugging purposes ( claiming how much quality has been lost ).

Reaching the best quality will require many IF statements . Since you can really apply the same encoding flags to videos on 8bit,10bit & 12bits . Also for the video based smpte2084 ,bt2020 and bt2020nc.

For example , in your platform try downloading this video , and make the quality the same . ( you can't with basic encoding ) https://youtu.be/LXb3EKWsInQ

With the actual encoder , you will have this result ;

When it should be this result ;

But thank you for sharing . I'll be using it more often now for debugging purposes .

I'm having hard time asking daniel to add simple array feature for bitrate array , and still nothing . https://github.com/WWBN/AVideo-Encoder/issues/294 So I don't think we gonna have any soon this feature , when we can't even chose the video's bitrate on dynamic encoding .

[ronaldod]

The intention is for tuning in an encoder with:

• new hardware
• test settings
• Quality Control from time to time.
• new ffmpeg releas
• etc etc

So yes this is an admin tool and for debugging purpose only as it will eat a lot of resources. But i think with this you can reach a good balance between file size, CPU-GPU usage, quality and speed. Depending on your needs you can tweak it with statistics and maybe auto mate it.