and after adding my files to a new sequence I noticed this type of glitch started happening (video):
I encountered various performance issues and lags many times, so first I reseted preferences and workspace to default, updated my graphics drivers, and disabled audio input without much succes.
The person who sent me the footage told me He used Samsung Galaxy s10+ and one of the updates enabled HDR10+ which is currently unsuported by most monitors and the footage looks gray and muddy when viewing on PC, so he used this method with mmpeg to convert it to normal SRD: https://www.maxvergelli.com/how-to-convert-hdr10-videos-to-sdr-for-non-hdr-devices/ And apparently it makes premiere and even MediaPlayerClassic lag. So it's definetly the mp4 file itself.
So my questions are:
A) Is there any other method to convert it so that it will not cause this types of audio/video glitches and lags?
B) I encountered various types of issues related to files having different codecs, resolution, FPS, format, etc. Usually I create new project, import my files and move one of them to create a new sequence and start working. Usually somewhere in the middle of editing premiere starts to act weirdly because of all this different footage. Is there a secret of working with files from different cameras, screen recordings from OBS, etc? do professionals usually convert the footage first? or how to make this workflow more consistent and smoother?
Actually yes! A lot of autohotkey scripts I created for transitions, color correcting, and audio effects just bugged and lagged so much on newer versions of premiere, and the program crashed at least 2 times a day. Where this version works flawlessly!