[FFmpeg-user] Qscale vs CRF

[Naveen.B]

Hello,

I need to understand the difference between Qscale and CRF in terms of
video compression.
In terms like, by using crf or qscale does it improve the Image quality and
the bandwidth, which one would be better using it?
I also found some links that qscale does not support in libx264, does that
mean that It needs to be used only with H265 or what does it mean?

Thanks,
Naveen B.