Output the audio codec of media files with FFmpeg

ffmpeg-output-acodec.sh

#!/usr/bin/env bash
find . -depth -maxdepth 2 -regextype posix-extended -regex '.*\.mkv$|.*\.mp4$' -type f -exec bash -c 'echo "{}" $(ffprobe -loglevel error -select_streams a:0 -show_entries stream=codec_name -of default=nw=1:nk=1 "{}")' \;

# stdout media files not using the AAC codec:
find . -mount -depth -maxdepth 2 -regextype posix-extended -regex '.*mkv$|.*mp4$' -type f -exec bash -c \
'echo "{}" $(ffprobe -loglevel error -select_streams a:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "{}")' 2>/dev/null \; \
| grep -v 'aac$'