How to add text, image, colour and timer overlays on videos using FFmpeg

Today, I used some filters on a public-domain video to add several kinds of overlays. My ffmpeg command was:

ffmpeg -y -i t.png -i t.mp4 \
       -filter_complex \
         "color=color=FF000066:s=1280x80:d=5,
          drawtext=x=20:y=(H-th)/2:fontcolor=ghostwhite:shadowcolor=black: shadowx=2:shadowy=2:text='How elections are stolen in the USA':fontsize=60:fontfile=${HOME}/.fonts/Billboard.ttf[t];
          color=color=FFFFFF00:s=1280x720:d=5[f];
          [f][t]overlay=x=0:y=H-h-20[o];
          [o][0:v:0]overlay=x=W-w-20:y=20:repeatlast=1[of];
          [1:v:0][of]overlay=x=0:y=H-h:repeatlast=1,
          drawtext=x=W-tw-20:y=H-th-30:
         fontfile='${HOME}/.fonts/Time-Normal.ttf':
         fontsize=round(H/30):fontcolor=FFFFFF77:
         text='%{eif\:mod(t/3600\,60)\:d\:2}\:%{eif\:mod(t/60\,60)\:d\:2}\:%{eif\:mod(t\,60)\:d\:2}'[v];
          [1:a:0]asetpts=PTS-STARTPTS,dynaudnorm=gausssize=3[a]" \
       -map '[v]' -map '[a]' \
       -c:v libx264 -crf 21 -preset medium -tune film  \
       -c:a libfdk_aac -vbr 5 \
       How-elections-are-stolen-in-the-USA.mp4 && \
       xdg-open How-elections-are-stolen-in-the-USA.mp4

The filters

1. color — Draws a translucent red background for the width of the video (t.mp4). Its duration is 5 seconds.
2. drawtext — Renders some text on the colour background for the same duration as above.
3. color — Creates a transparent frame that is the same size as the video.
4. overlay — Places the text and its red background on the frame.
5. overlay — Places the book image (t.png) on the frame from previous step.
6. overlay — Places the frame with overlaid text, red band and book image on the video (t.mp4).
7. drawtext — Draw the timer.
8. asetpts — Rewrite timestamps.
9. dynaudnorm — Autolevel volume.

Demo video

Apart from the overlays, the low volume in the original video has been fixed in my ‘filtered’ video.

The original video

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