danielfomin96 · June 19, 2023 01:36 · ivaylo-mk · Jan 22, 2023 · mark-cassidy · Jan 22, 2023
diff --git a/ffmpeg b/ffmpeg
 #!/bin/bash -
 #title           :ffmpeg
 #description     :This script is a wrapper for jellyfin ffmpeg to downmix audio to stereo using a custom formula
 #author          :Daniel Fomin
 #date            :20230104
 #version         :0.2
 #reference       :https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg
 #
 #
 #==============================================================================

 ###############################################################################
 # Installation Notes: 
 #   1. Put wrapper in directory accessible from jellyfin
 #   2. `chmod +x path/to/wrapper/dir/ffmpeg`
 #   3. `ln -s $(which ffprobe) path/to/wrapper/dir/` to the same directory
 #   4. Point jellyfin to the wrapper directory
 #
 ###############################################################################

 function join { local IFS=$'\n'; echo "${*}"; }

 args=$(join "${@}")

 match='-ac\n[3-9]'
 replace='-af\npan=stereo|FL<0.707*FC+0.707*FL+0.707*BL+0.5*LFE|FR<0.707*FC+0.707*FR+0.707*BR+0.5*LFE'
 ffmpeg="/usr/lib/jellyfin-ffmpeg/ffmpeg"

 readarray -t new_args < <(sed -z "s/$match/$replace/g" <<<"$args")

 #echo "Command Rewrite: $ffmpeg $new_args" 1>&2

 $ffmpeg "${new_args[@]}"
 exit $?
	#!/bin/bash -
	#title :ffmpeg
	#description :This script is a wrapper for jellyfin ffmpeg to downmix audio to stereo using a custom formula
	#author :Daniel Fomin
	#date :20230104
	#version :0.2
	#reference :https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg
	#
	#
	#==============================================================================

	###############################################################################
	# Installation Notes:
	# 1. Put wrapper in directory accessible from jellyfin
	# 2. `chmod +x path/to/wrapper/dir/ffmpeg`
	# 3. `ln -s $(which ffprobe) path/to/wrapper/dir/` to the same directory
	# 4. Point jellyfin to the wrapper directory
	#
	###############################################################################

	function join { local IFS=$'\n'; echo "${*}"; }

	args=$(join "${@}")

	match='-ac\n[3-9]'
	replace='-af\npan=stereo\|FL<0.707FC+0.707FL+0.707BL+0.5LFE\|FR<0.707FC+0.707FR+0.707BR+0.5LFE'
	ffmpeg="/usr/lib/jellyfin-ffmpeg/ffmpeg"

	readarray -t new_args < <(sed -z "s/$match/$replace/g" <<<"$args")

	#echo "Command Rewrite: $ffmpeg $new_args" 1>&2

	$ffmpeg "${new_args[@]}"
	exit $?