Does using preset=placebo or veryslow option also decrease decode time?

Question

When using h.264 I use preset=placebo option. It increases encoding efficiency, but I don't know I feel like it is also increasing decoding time. Is it right or it doesn't affect decoding time at all?

Answer 1

You can use null muxer to test it. As stated in Null - FFmpeg

The null muxer does not generate any output file. It is mainly useful for testing or benchmarking purposes.

This page provides a command line to check this out:

To test decoding and demuxing (using null muxer):

ffmpeg -i input -f null -

If your video is too short, you can try running a certain number of times. If you are using Windows, you can run cmd.exe and use the following to make the test 100 times:

for /l %a in (1,1,100) do ffmpeg -i input -f null -