The rumble, wtyl and streamyard resolution and quality of Rixey's presentation were unacceptable.
I performed a correction as follows:
downloaded the 6GB file of the congress from streamyardextracted the audio to .wavimported audio to Audacityran a FFT spectral analysis to get the frequency spectrum of the audioapplied an inverse spectrum of the audio to rixey's presentation to get a flat responsereran equalisation with a hand-tuned curve for acceptable frequency distributionran the audio through a volume limiterdownloaded Rixey's pdf presentationconverted the pdf slides to .png images at 300dpiimported the presentation video, slides and corrected audio into shotcut and cropped Rixey's face to lower-right cornerexported the presentation to 1440pran the .wav file of the audio through whisper.cpp to get a raw transcriptcorrected the defective output .srt to properly formatted subrib .srt formatran through the video three times, correcting timing and text errors by hand.compressed intermediate video to h264 with slideshow tuning. At 1440p the text is as readable as in the pdf.