Question / Help artifacting 1 minute into recording

[Blaster Brewmaster]

log file https://gist.github.com/cea59cae124cccff89e914b90004b414

Video of issue occuring https://youtu.be/RWFtxjPwnUI

I'm having an issue I can't seem to resolve. When my output resolution under video is scaled down from 1080p (base canvas) to 720p it causes terrible artifacting in my output video. I used to even have it when doing unscaled but seemed to have at least fixed that part (but it puts a heavy strain on my computer when trying to stream and record at the same time).

Settings are as follows

base canvas 1080p
output scaled resolution 720p
downscale filter lanczos (sharpened scaling, 32 samples)
common fps 60

recording format mp4
encoder AMD video coding engine h.264 Encoder (media foundation)
Rescale output off

Profile high
Keyframe interval 2
Rate Control CBR
Bitrate 10,000
Custom buffer size 10,000
Custom Max bitrate disabled
Low latency disabled
Consecutive B-Frame count 2
Minimum QP 2
Maximum QP 51

 

[Harold]

Mediafoundation VCE doesn't support CBR properly and also needs more bitrate than x264 to maintain picture quality.

Try simple output mode, indistinguishable quality, x264 low cpu use encoder

Also, saving directly to mp4 is not recommended. Anything that interferes with the finalizing of the file can and will cause the recordings to be irrecoverably corrupt.

 

[Blaster Brewmaster]

ok, what would be a output format that I can save to that'll do multi-audio tracks?

 

[Gol D. Ace]

mkv I think for example.

 

[Blaster Brewmaster]

Ok I'll have to try that out. I did switch to it to do a test and instead of using x264 kept it on the AMD one but switched it to Constant Quality instead of Constant bitrate and after playing around trying to get my output quality right changed Minimum QP to 1 and Maximum QP to 3. Seems like it looks good and stable on a 10 minute test recording.

Only question I have with that is editing wise, would I need to reprocess the output file before bringing into Premiere Pro? I know with VBR (or maybe it's VFR) desynching will happen unless the footage is reprocessed through handbrake or another program with constant framerate set to match the videos original target framrate

 

[Gol D. Ace]

Premiere Pro can't read mkv containers so you need to at least remux the file.
And what you mean should be VFR. VBR is fine.