Question / Help Downscaling the stream to 720p, but YT actually got 1080p?

[unfa]

I've been testing out streaming and I used downscaling to make the stream lighter.

My desktop and canvas were 1920x1080, I used the downscaling to make it 1280x720.

Watching the stream archive on YT I've noticed it's playing in 1920x1080, while the image is pixelated and obviously not as high resolution.

What is going on?

Is OBS downscaling to 720p, then upscaling again to 1080 and streaming that? It'd mean that the downscaling was just a waste of resources and quality with no gain whatsoever.

Here's the stream archive: https://www.youtube.com/watch?v=VqhHzaS5Elk (jump to 35:00 - there you an easily see the real image resolution).

 

[dodgepong]

Do you have a log from when you did this stream?

 

[unfa]

I don't even know where t o look for it. I cant test this again and see if it's happening every time.

Where can I find the stream log?

 

[Deleted member 70571]

Here's how you post a log: https://obsproject.com/forum/threads/problem-make-sure-to-post-a-log-and-or-crash-dump-howto.97/

 

[unfa]

Ok, maybe it's because YouTube first got 1080p and treated the 720p stream as the continuation to the first chunk so it upscaled the latter to make it fit.

I tried making a 1080p stream, then I switched to downscale to 720 and continued. I used a bitmap that hd every other row black to easily see when the resolution changes. The 720p part of the stream displays big bands, resulting in a moire effect that the bitmap produced after downscaling.

Here's the log (thanks, progressivehorror!):
https://gist.github.com/f9c50338ce4fbdeb674aa7d0cc02de54

 

[Deleted member 70571]

It must be a YouTube-related problem. Nothing to worry about unless performance issues appear.

 

[unfa]

Ok, maybe it's because YouTube first got 1080p and treated the 720p stream as the continuation to the first chunk so it upscaled the latter to make it fit.

I did another stream the next day starting from 1280x720 downscale, and the stream is viewable in exactly that resoultion, so I think that proves what I suspected.

This is not an OBS-realated thing, nor it is a problem. Sorry for raising a false alarm.