Question / Help Video downscale or Canvas resize?

XRey360

New Member
I haven't found much about this so my apologies if I'm posting about an already answered question.

Due to obvious reasons I need to downscale my screen (2560x1440) to a more streamable size. I'm not sure whether 1080p or 720p as it comes to bandwidth or quality issues.

Anyway, excluding the Output scale setting (which I have read is used generally only if you record and stream at different resolutions), I have came across two options:

1. The first and most logic way is using the Video setting tab, set my native screen resolution as base canvas, and set the output scaled resolution that I require. Downscale filter can be either Bicubic or Lanczos (I have yet to grasp the difference of them since both look similar in quality and performance to my eyes) and I'm done with it. I have been using that way for a while and haven't had any problem, as I imagine it's for everyone else too.

2. Second way is a bit less logical: give a base canvas which is already downscaled (720p instead of my 1440p) and then in the sources tab transform the window to fit the scaled resolution, effectively downscaling to the needed size. This way also allows additional scale filter options (Disable and Point modes) which I'm not sure what is their function compared to the other three.

The reason I have came across this second method is that I need at times to record an old game in windowed mode (as it doesn't run at fullscreen), but that leaves black areas on the canvas and generally making the output stream too small to see. I haven't tried to upscale the window to fill the canvas, but since I'm anyway downscaling it for the stream, it sounded a bit illogical.

Having the canvas already smaller and just downscaling the different sources depending on the need makes more sense, but I'm not sure about the impact of this action. I have tried making some test recording with both methods and honestly I have a hard time to find differences in the quality or performance loss, so I have to ask: what are the downsides of using a way or another?
 

XRey360

New Member
Update:
as I have been doing more tests, I have found the second method to be actually quite good in certain situations without causing any big loss. In addition, I have found that the Disable scale filter option maintains a rather acceptable quality.
Filter test 720p: https://clips.twitch.tv/GoldenPeacefulJamTF2John

However I would still love to hear a second opinion
 
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