✨ extract-cover: Extract cover from the given media file

extract-cover

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+#!/bin/sh
+# Extract cover image from the given media (e.g. M4B or MP3)
+for fn in "$@"; do
+  cover_jpg="$(mktemp -u $(dirname "$fn")/cover-XXXXX.jpg)"
+  if ffmpeg -v error -i "$fn" -map 0:v -map -0:V  -c copy "$cover_jpg"; then
+    echo "$cover_jpg"
+  else
+    rm -f "$cover_jpg"
+    echo "couldn't extract cover from $fn" >&2
+  fi
+done