Ignore placebo as it provides insignificant returns for a significant increase in encoding time. Use the slowest preset you have patience for. Valid presets are ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow, and placebo. The preset determines compression efficiency and therefore affects encoding speed. Chances are the defaults are aggressive and according to it will default to medium quality profile. That "VMAF score" looks similar just tells you that a human probably won't see a difference, not how much data has been lost.įfmpeg will decode frames and reencode them using whatever its default settings are. The major difference though is going to be in the fact that Adobe and ffmpeg have different default quality and bandwidth settings. Minor or imperceptible detail will be lost or approximated using algorithms of the compressor. That is one of the places that the reduction in size has come from. You will have lost data in re-encoding irrespective of perceptual "quality".
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