screencapture.sh

#!/bin/bash

WINDOW_TITLE="Bullet Physics"

source env.sh
python3 src/rocketcraft.py &
PROGRAM_PID=$!

# Wait for the window to appear
WINDOW_ID=""
while [ -z "$WINDOW_ID" ]; do
  sleep 2.0  # Wait a bit before checking again to avoid excessive CPU usage
  WINDOW_ID=$(wmctrl -l | grep "$WINDOW_TITLE" | awk '{print $1}')
done

# Get window geometry
GEOMETRY=$(wmctrl -lG | grep "$WINDOW_TITLE" | awk '{print $5"x"$6"+"$3"+"$4}')

CURRENT_DISPLAY=$DISPLAY

# Start capturing using ffmpeg, running in the background
ffmpeg -f x11grab -framerate 25 -video_size "$(echo $GEOMETRY | awk -F'+' '{print $1}')" -i $CURRENT_DISPLAY+$(echo $GEOMETRY | awk -F'+' '{print $2","$3}') -y output.mp4 &
FFMPEG_PID=$!

# Monitor the program's process. If the program exits, stop the ffmpeg recording.
while kill -0 $PROGRAM_PID 2> /dev/null; do
  sleep 0.1
done

# Stop ffmpeg by sending a 'q' command to gracefully end recording
kill -SIGINT $FFMPEG_PID

# Wait a bit to ensure ffmpeg has time to finish writing the video file
wait $FFMPEG_PID


# Crop:
# ffmpeg -i output_ai.mp4 -filter:v "crop=500:500:250:20" output_ai_crop.mp4
# Add text
# ffmpeg -i output_mpc_crop.mp4 -vf "drawtext=text='MPC':x=20:y=20:fontsize=48:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=2" output_mpc_crop_text.mp4
# ffmpeg -i output_mpc_crop_text.mp4 -i output_ai_crop_text.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]" -map "[v]" output_mpc_ai.mp4