Hello, I'm new to the computation of VMAF scores using libvmaf in ffmpeg. While trying out generating scores through libvmaf, I have an issue that I cannot seem to find an explanation for.
I encoded the 'crowd_run' HQ MP4 with two different encoders. The resulting files were compared with the same source (original). VMAF score of ffmpeg encoded clip: [libvmaf @ 0x7fc5d8f2cb00] VMAF score: 90.644028 Command used: ffmpeg -i crowd_run_1080p50.mp4 -c:v libx264 -g 100 -keyint_min 100 -sc_threshold 0 -b:v 12000k -maxrate 15000k -bufsize 15000k -c:a copy -f mpegts pass2.ts VMAF score for externally encoded clip: [libvmaf @ 0x7fc53d729500] VMAF score: 25.168431 I just don't know how to explain this disparity in generated scores when framerates and resolution of the source were retained. The second clip doesn't seem to show such a degradation expected through the score. Attaching both the encoded clips here for analysis. Could anyone point me to why the external encoder generates an output with low VMAF score. Anything in the frame structure? ffmpeg encode: https://drive.google.com/file/d/15-9YyNhYWJoTMxdmESkc7b0mPKKUMqG7/view?usp=sharing external encode: https://drive.google.com/file/d/1Mt2jP51KZ4vTG7SYPnJkCG1uMWqOadid/view?usp=sharing Thank you. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
