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How to record high quality smooth Celeste TAS video with kkapture

.kkapture is a small tool that produces video+audio captures of apps (usually demos). Unlike OBS Studio, it does not run in realtime; instead, it makes the demos run at a given, fixed framerate you can specify beforehand. In other words, .kkapture can make 60fps video captures of any demo your computer can run, even if each frame takes several seconds to render.

how to use it:

1. download then start kkapture.exe, specify demo (steam version requires creating a file called steam_appid.txt with the content 504230 in your celeste folder)
2. select your codec of choice
3. check Seprate encoder thread (improve performance)
4. hit kkapture! run the game
5. run TAS normally
6. press right alt to close the game when tas finished
7. you will get Celeste.xx.avi or Celeste.mp4 and Celeste.wav (if you select x264 as encoder)
8. if you select x264 as encoder, drag and drop the Celeste.mp4 onto the tools/combine_mp4+wac_to_mp4.bat file will merge it with the Celeste.wav and output the Celeste_with_audio.mp4
9. done