Check VMAF of viddumped video

[Classic SSG Enjoyer]

Greetings to everyone here!

 

As you all know, that viddumping is the process of converting doom demos i.e .lmp files to videos. Source ports like DSDA-Doom, PrBoom+ and PrBoomX support this feature of viddumping. FFMPEG is used for viddumping demos to videos.

 

But, recently, I got to know the concept of VMAF, which is an Emmy-winning perceptual video quality assessment algorithm developed by Netflix. 

 

We can calculate VMAF scores when we have both the 'lossless file, which has audio and video in lossless format' and the encoded video which is of more managable file sizes. Now, the encoded videos (if they are not recorded in lossless mode, for audio and video e.g flac audio and libvpx-vp9 with `-lossless 1` ( in FFMPEG)  determine 100% lossless audio and video compression.) are lossy in nature. But generally people don't encode in lossless if they want to share it to Youtube or other video sharing sites, because of file size issues. Encoded can be also 'visually lossless' which is ofcourse subjective.

 

But, in this case, we don't have any 'video file' for input because both the audio and video are encoded as the demo plays back, so how to check VMAF with help of FFMPEG when we are viddumping our demos to videos ?

Edited December 18, 2023 by Classic SSG Enjoyer