update:extend old scripts + new random ones

media/video-compress.sh

@@ -1,2 +1,44 @@
 #!/bin/bash
-ffmpeg -i "$1" -c:v libx265 -crf 24 -preset medium -c:a aac -b:a 128k "$2"
+set -euo pipefail
+
+if [ "$#" -ne 2 ]; then
+  echo "Usage: $0 <original-video> <new-video>"
+  echo "Example: $0 input.mp4 output.webm"
+  exit 1
+fi
+
+INPUT="$1"
+OUTPUT="$2"
+
+if [ ! -f "$INPUT" ]; then
+  echo "Error: input file not found: $INPUT"
+  exit 1
+fi
+
+if [ "$INPUT" = "$OUTPUT" ]; then
+  echo "Error: input and output must be different files"
+  exit 1
+fi
+
+EXT=$(printf '%s' "${OUTPUT##*.}" | tr '[:upper:]' '[:lower:]')
+
+case "$EXT" in
+  mp4)
+    ffmpeg -i "$INPUT" \
+      -c:v libx265 -crf 24 -preset medium \
+      -c:a aac -b:a 128k \
+      -movflags +faststart \
+      "$OUTPUT"
+    ;;
+  webm)
+    ffmpeg -i "$INPUT" \
+      -c:v libvpx-vp9 -crf 32 -b:v 0 -deadline good -cpu-used 2 \
+      -c:a libopus -b:a 128k \
+      "$OUTPUT"
+    ;;
+  *)
+    echo "Error: unsupported output format '.$EXT'"
+    echo "Use output extension: .mp4 or .webm"
+    exit 1
+    ;;
+esac