Setup:

1. Install Undertale and Deltarune Chapter 1 and 2 Demo on Steam on Linux.
2. Run ./makeltm.sh undertale.ltm; ./makeltm.sh deltarune.ltm
3. Run ./convert-deltarune.sh to automatically perform the steps described in https://www.reddit.com/r/Undertale/comments/prg9n1/how_to_get_deltarune_chapter_2_running_on_linux/
4. Start Undertale via $HOME/.steam/steam/steamapps/common/Undertale/runner and Deltarune via [this folder]/deltarune/runner

Dumping:

• Filename should be undertale.mp4 or deltarune.mp4 in this directory.
• ffmpeg settings: -c:v libx264 -crf 0 -c:a flac -strict -2 -movflags +faststart (you can use whatever you want; these are just my settings)
• Record movie as usual for libTAS.
  • Tools / Start encode
  • Make sure "Movie recording" is enabled (otherwise the game will not receive any inputs at all)
  • General Options / Pause must be unchecked or the TAS will wait on frame 1 for input.
  • General Options / Fast-forward can be checked to remove the wait time between frames. (This will desync on Deltarune.)
  • Click Start.
  • Wait for the video to play through, then click Stop.

Encoding:

• undertale.mp4, undertale_1.mp4, deltarune.mp4, and deltarune_1.mp4 should already be in this directory.
• If you do not have a Go compiler installed:
  • Get someone else to compile readout.go for you.
  • Edit encode.sh to call the compiled executable instead of go run readout.go.
• Run ./encode.sh.

Editing:

• Use ./makeltm.sh filename.ltm to pack the tas directory into a libTAS movie.
• Edit the movie as it would be normally done in libTAS.
• Use ./commit.sh filename.ltm to store your changes in Git. This will open your text editor for a commit message.

Special thanks

• Determination fonts from https://www.behance.net/gallery/31268855/Determination-Better-Undertale-Font