Am 15.10.23 um 15:43 schrieb Reindl Harald:
Am 15.10.23 um 15:12 schrieb Ulf Zibis:
by accident I transcoded a video with -preset veryfast (it took 1 h).
So I had to run it again with -preset veryslow (it took 12 h).
Now I'm wondering about the file sizes. How can that be?
why not?
if you prefer fast you don't care about quality
in doubt quality needs space and find a compromise between size and space - you
can't have both - and well, depending on the source material fast can be small
and good enough in quality
In my understanding quality also needs CPU time.
See: https://trac.ffmpeg.org/wiki/Encode/H.264
There I can read:
"for constant quality encoding, you will simply save bitrate by choosing a slower
preset."
As I used the same -crf value for all 3 runs, I'm still wondering, that I
experienced the opposite.
-Ulf
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