I believe you can change the scaling algorithm obs uses? Right click the source and go to "scale filter" is what Google is telling me, not at a computer right now. I think it defaults to bicubic which should be ok though? The switch does its own internal scaling a lot of the time and that can look pretty bad though, but unless you get into some serious shenanigans that's basically baked in.
this post was submitted on 02 Jul 2024
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As I understand you take in some stream video akin to /dev/video0 and want to enlarge it so you can look at your monitor while playing? Whenever it is something with video ffmpeg can probably solve it. FFmpeg flags like -vf also work on the video player, ffplay.
https://trac.ffmpeg.org/wiki/Scaling
At the bottom they talk about choosing scaling algorithms, try some out to see what combination of quality and speed you get.