@Reotch2 I started by editing together the videos into a single 5 minute video, using the vertical sources. These show up on my normal computer monitor as rotated 90 degrees. Once i had the video edited (with several of the buffer video interspersed to add some tension), I output the video as a full resolution 1920x1080 MP4. I copied that video over to the pi and then used ffdshow to rotate the video 90 degrees. This part took close to 30 minutes and it made the pi sweat resistors.
Once the file was rotated, I created a one-line script file called boo.sh that contains omxplayer -p -o hdmi --loop --alpha 85 boo.mp4. Start it up with pm2 (pm2 start boo.sh) and then save it.
Originally I was going to convert the file to webm, but the ffdshow that installed on the pi doesn’t have that switch enabled. I didn’t feel like recompiling ffdshow, so I just went with a H264 encoded MP4.