Extract LUFS only from multiple file

Question

ffmpeg -i input.mp4 -af ebur128=framelog=verbose -f null - 2>&1 | awk '/I:/{print $2}' The above command extract only LUFS value from input.mp4 file. But If there are number of mp4 files, how to apply similar command to extract LUFS value only from multiple mp4 files? Please help.

Answer 1

Adapting this answer from How do you convert an entire directory with ffmpeg?

for i in *.mp4; do echo "$i:"; ffmpeg -i "$i" -map 0:a -af ebur128=framelog=verbose -f null - 2>&1 | awk '/I:/{print $2}'; done

Example output:

video1.mp4:
-21.8
video2.mp4:
-21.1
video3.mp4:
-21.8
-8.3

• Note that video3.mp4 contains 2 separate audio streams.
• This is assuming you can use Bash shell.
• -map 0:a was added to only process the audio so the video is ignored and therefore the command is faster. See FFmpeg Wiki: Map.