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master-of-zen / Av1an

Cross-platform command-line AV1 / VP9 / HEVC / H264 encoding framework with per scene quality encoding
GNU General Public License v3.0
1.51k stars 155 forks source link

Multiple resolutions output #666

Closed phpb-com closed 2 years ago

phpb-com commented 2 years ago

Hi, after struggling to find the answer I wanted to check here if it was possible to output multiple resolutions instead of rerunning av1an with the difference in ffmpeg filter. Or, at least, can we somehow save the progress of the previous run so av1an does not have to probe quality for VMAF over and over for each resolution. Thanks.

BlueSwordM commented 2 years ago

That could work, but to avoid redoing the calculation, we'd need to do a lot of testing for each encoder to assign interpolation curve values/formulas to correctly scale quality levels based on resolutions.

phpb-com commented 2 years ago

Thanks for the reply. I guess my naive thinking at the time was that VMAF score will not be altered based on resolution. But since it is not the case, my request probably makes no sense :-)