Duration: 1:03

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UPDATE 2 Jan '22: Daerik's guide has instructions and a download to do this easily in dsda-doom: https://www.doomworld.com/forum/topic/116534-dsda-doom-guide-usage-recording-demos-and-some-extra-info/

UPDATE 6 Dec '21: Dimon12321 has a pre-packaged prboom for -viddumping HERE: https://www.doomworld.com/forum/topic/111023-how-do-i-use-viddump-solved/?tab=comments#comment-2060137
Thank you Dimon12321!

viddump win32 files download (also works on x64) https://www.mediafire.com/file/31lk3sziboptly2/prboom_viddump_win32.zip/file
FFMPEG Windows build (drop the ffmpeg.exe into your prboom folder)
https://www.gyan.dev/ffmpeg/builds/

Did you record an lmp file? (NOT ON ZDOOM/GZDOOM)
1) download latest graf zahl/fabian prboom-plus fork https://github.com/coelckers/prboom-plus/releases (or use the old 2.5.1.4 release I used in this vid)
2) drop the viddump win32 files into your prboom-plus folder (where you unzipped the prboom port)
3) do "prboom-plus -timedemo [your demo filename] -viddump [desired video filename.mkv] NOTE: YOU MUST USE TIMEDEMO AND NOT PLAYDEMO ARGUMENT
4) if that made a .mkv file in your folder, you can literally just drop it on the YouTube upload prompt and you have an uploaded YouTube video!
5) didn't make an mkv? go to the second link above (FFMPEG Win32 build), download, unzip, and pull the ffmpeg.exe into your prboom-plus folder, then start again at step 3

video capture system by Nicholai Main, which records from a demo "so that people using even the most pathetic computers imaginable could capture smooth videos with no dropped frames and perfect AV sync."