ffmpeg : add ffmpeg_music_artist.

.README.md

@@ -483,6 +483,7 @@ Command|Description
 ---|---
 `ffmpeg_mux_audio <SOUND> <RESULT>`|Mux external audio into one container with video (replaces original audio). Run inside dir with original video. <SOUND> names should be the same for each video.
 `ffmpeg_mux_cover <FORMAT> <COVER>`|Mux image into files of specified format.
+`ffmpeg_music_artist <FORMAT> <ARTIST>`|Change audio artist metadata.
 
 ## File.
 

.config/bash/module/ffmpeg.sh

@@ -19,15 +19,39 @@ ffmpeg_mux_cover()
     return
   fi
 
+  local format="${1}"
+  local cover="${2}"
+
   mkdir out
 
-  for file in *.${1}; do
+  for file in *.${format}; do
-    ffmpeg -i "${file}" -i "${2}" -map 0:a -map 1 -codec copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic ./out/"${file}" || return 1
+    ffmpeg -i "${file}" -i "${cover}" -map 0:a -map 1 -codec copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic ./out/"${file}" || return 1
   done
 
   mv out/* . && rm -d out/ && rm "${2}"
 }
 
+# Change audio artist metadata.
+# Usage: ffmpeg_music_artist <FORMAT> <ARTIST>
+ffmpeg_music_artist()
+{
+  if [[ "${1}" = "" ]]; then
+    echo "Usage: ffmpeg_music_artist <FORMAT> <ARTIST>"
+    return
+  fi
+
+  local format="${1}"
+  local artist="${2}"
+
+  mkdir out
+
+  for file in *.${format}; do
+    ffmpeg -i "${file}" -c copy -metadata "ARTIST=${artist}" -metadata "album_artist=${artist}" ./out/"${file}" || return 1
+  done
+
+  mv out/* . && rm -d out/
+}
+
 _ffprobe_fps()
 {
   local fps=$(ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate "${1}")