alazycoder

J Wang
#!/bin/bash
send2pipe() {
  # Open the pipe permanently
  exec 7<>outpipe
  # Decode and send every raw frame to the pipe 
  for l in $(ls *avi); do ffmpeg -nostdin -i $l -an -filter:v fps=fps=5 -f rawvideo pipe:1 > outpipe 2> /dev/null ; done &
  # Close the pipe (aka send EOF), which causes the encoding app to terminate
  exec 7>&-
}

# Create the pipe
mkfifo outpipe
# Start sending videos to the pipe in the background
send2pipe &
# Encode the frames in the pipe to a single video
ffmpeg -fflags +genpts -f rawvideo -s:v 1280x720 -r 5 -i outpipe -an -c:v libx264 -preset ultrafast -crf 35 -y output.mkv
# Remove the pipe
rm outpipe