I did not tune for PSNR or SSIM because I performed all tests with the same codec and encoder.įigure 1 shows the resulting metrics scores, with PSNR averages multiplied by 2.5 and SSIM averages multiplied by 100 to display them in the same graph as VMAF. I encoded all files using the same FFmpeg parameters and measured VMAF, SSIM, and PSNR. The second were the files processed using the FFmpeg approach (FFmpeg Filters), and the third processed via BitSave (BitSave). One set of files was the source file encoded with no processing (Baseline). I produced three sets of files using 17 20-second test files, including movies, animation, sports, and gaming.

Since it's simple to 'hack' VMAF to deliver improved scores that may not correlate with subjective video improvements, I created my own FFmpeg-based hacking algorithm to compare to BitSave. ISize's website claims that it delivers a 40% to 60% bitrate reduction, so I tested at 60% the data rate of the other test approaches. I'll start with a pithy summary, and then circle back for the deep dive. ISize BitSave is a video pre-processing technology designed to improve the quality of the video that you produce.

What is ffmpeg reviews