ubuntu linux - how to watermark a video from cli

# Download video from youtube :
sudo apt-get install youtube-dl
youtube-dl -b -l "link to youtube video" 
[or: youtube-dl -b -t "link to youtube video"]

sudo apt-get isntall ffmpeg

ffmmpeg -i in.flv out.avi
--------------------------
sudo apt-get install avidemux avidemux2_cli 

# prepare the logo
cat > logo.avidemux_filters
<?xml version="1.0"?>
<filters FilterNumber="1">
  <Filter Tag="79" Conf="Logo at 0 0, alpha 194067208">
    <Parameters Number="4">
      <image>/tmp/dollar-small.png</image>
      <x>0</x>
      <y>0</y>
      <alpha>255</alpha>
    </Parameters>
  </Filter>
</filters>
<ctrl>-d

avidemux2_cli --load "41wL9Nko4aI.flv" --audio-codec MP3 --video-codec XVID4 --filters "logo.avidemux_filters" --output-format AVI --save "myvideo01avi" --quit