x264 resizing question

[BabaG]

i have some video at 2048x1152 that i need to resize to 1920x1080. i'd like to fold the resizing into other parameters i'm feeding x264 so i can do it all at once. i thought i'd use lanczos as the method but would be happy to be corrected if that's not the best method for this. what is the cli command for this? should i use fittobox? what is the syntax to do this resize?

thanks,
BabaG

[poisondeathray]

i have some video at 2048x1152 that i need to resize to 1920x1080. i'd like to fold the resizing into other parameters i'm feeding x264 so i can do it all at once. i thought i'd use lanczos as the method but would be happy to be corrected if that's not the best method for this. what is the cli command for this? should i use fittobox? what is the syntax to do this resize?

--vf resize:1920,1080,method=lanczos

There is no "best" method for every scenario. They all have pros/cons. Your options are

- method: use resizer method ["bicubic"]
- fastbilinear, bilinear, bicubic, experimental, point,
- area, bicublin, gauss, sinc, lanczos, spline

You don't need fittobox because you're starting with 16:9 and ending with 16:9

[BabaG]

thanks very much, pdr. very quick response. i'll try it soon. so, for lanczos, there's just the one option? no lanczos3, lanczos4?

thanks again,
BabaG

[poisondeathray]

Those are the only options because the patch was "borrowed" from ffmpeg swscale

https://ffmpeg.org/ffmpeg-scaler.html

If you're wondering, "spline" is sharper than avisynth's spline16, but softer than spline36

But 2048x1152 => 1920x1080 isn't a large change, so you won't notice as much difference between them than if you were use a proportionately larger change

[BabaG]

thanks!