[FFmpeg-user] -preset veryfast produces smallest file, weird

[Reindl Harald]

Am 15.10.23 um 16:43 schrieb Ulf Zibis:
> 
> 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

but with "veryfast" you statet "i do not care about quality" and losing 
details by not care about quality *can save* space - common sense