How to set background to subtitle in ffmpeg?

Question

It is described here how ot burn a srt file into a video. However, I want to put a semi-transparent background to the subtitles so that the texts can be read more easily. H

Answer 1

Create a png with a transparent box and a alpha channel in your favoured size. You can use e.g. gimp or photoshop.

Then use this command:

ffmpeg -i video.mp4 -i logo.png -filter_complex "[0:v][1:v]overlay=10:10" \
-codec:a copy out.mp4

where 10:10 is the distance from the upper left corner.

After that you can insert your subtitles.