Imagine a picture, you try to stretch it, do you expect it to increase quality or decrease?

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imagine a picture, you try to stretch it, do you expect it to increase quality or decrease?
is it really unusable?

thecatvoid 2022-07-30 17:34:14

siduck 2022-07-30 17:29:49

ffmpeg -vf scale=-1:2160:flags=lanczos -video_size 1920×1080 -framerate 60 -f x11grab -i :1 -c:v libx264rgb -crf 0 -preset ultrafast -color_range 2 output.mp4

would the -video_size arg here mess with the scale arg?

ffmpeg -i ‘video.mp4’ -vf scale=3840×2560:flags=lanczos output_4k.mp4

alexmb7 2022-07-30 17:34:56

no wonder its slow

alexmb7 2022-07-30 17:35:06

u need gpu accel activated

Crypto0DaySTA 2022-07-30 17:35:14

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alexmb7 2022-07-30 17:35:15

if available in compile time

thecatvoid 2022-07-30 17:35:28

alexmb7 2022-07-30 17:35:06

u need gpu accel activated

i have, and it lags more

alexmb7 2022-07-30 17:35:35

thecatvoid 2022-07-30 17:35:45

siduck 2022-07-30 17:33:26

ok i moved the scale arg after the input arg. The recording is laggy and my system lags when recording too

use -threads argument

thecatvoid 2022-07-30 17:35:51

set it to low

alexmb7 2022-07-30 17:35:52

well i dunno all these in practice,

alexmb7 2022-07-30 17:36:08

i used multimedia creation on mac os 9

siduck 2022-07-30 17:38:56

thecatvoid 2022-07-30 17:34:14

ffmpeg -i ‘video.mp4’ -vf scale=3840×2560:flags=lanczos output_4k.mp4

i already use it, its decreases my 60FPS recording to below 20 FPS :/

siduck 2022-07-30 17:39:15

i tried hardware accel with cuda too, does nothing xD

thecatvoid 2022-07-30 17:40:12

siduck 2022-07-30 17:38:56

i already use it, its decreases my 60FPS recording to below 20 FPS :/

add -r 60 -framerate 60

alexmb7 2022-07-30 17:41:48

siduck 2022-07-30 17:39:15

i tried hardware accel with cuda too, does nothing xD

bad linux porting i guess

alexmb7 2022-07-30 17:41:56

or try otherffmpeg sw

alexmb7 2022-07-30 17:42:13

i mean other, not some specific thingy

siduck 2022-07-30 17:42:15

thecatvoid 2022-07-30 17:40:12

add -r 60 -framerate 60

tried this already, look

alexmb7 2022-07-30 17:42:33

siduck 2022-07-30 17:42:15

tried this already, look

no wonder to me

alexmb7 2022-07-30 17:42:35

thecatvoid 2022-07-30 17:42:56

siduck 2022-07-30 17:42:15

tried this already, look

what if you also add -crf 0

thecatvoid 2022-07-30 17:43:12

ah you already did that