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September 15, 2023

Charles Rixey - Long Covid Congress - 2023 Sep - Fixed Audio/Video

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 streamyard

extracted the audio to .wav

imported audio to Audacity

ran a FFT spectral analysis to get the frequency spectrum of the audio

applied an inverse spectrum of the audio to rixey's presentation to get a flat response

reran equalisation with a hand-tuned curve for acceptable frequency distribution

ran the audio through a volume limiter

downloaded Rixey's pdf presentation

converted the pdf slides to .png images at 300dpi

imported the presentation video, slides and corrected audio into shotcut and cropped Rixey's face to lower-right corner

exported the presentation to 1440p

ran the .wav file of the audio through whisper.cpp to get a raw transcript

corrected the defective output .srt to properly formatted subrib .srt format

ran 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.

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