[SOLVED] How to run ffmpeg in a loop in the terminal to generate videos using files from every subdirectory

Issue

I have some directory ./vis that contains images that I want to loop through to generate a video. If I were to do it within one of the subdirectories, say ./vis/subdir1 I could run:

ffmpeg -framerate 10 -pattern_type glob -i '*.jpg' out.mp4

Now I want to generate videos for every single subdirectory, I tried this:

for d in */; do ffmpeg -framerate 10 -pattern_type glob -i '${d}*.jpg' "${d}".mp4"; done

But it does not seem to work. Any ideas?

Solution

• '${d}*.jpg' is wrapped with single quotes and the variable d is not interpolated.
• "${d}".mp4" is not properly quoted. Besides, the variable d contains a trailing slash, which must be removed.

Then please try the following:

for d in */; do
    ffmpeg -framerate 10 -pattern_type glob -i "$d*.jpg" "${d%/}.mp4"
done

Answered By - tshiono