generalize convert-to-mp3 into convert-audio with selectable target format

- rename task to convert-audio, support mp3/flac/wav/ogg/aac/opus targets
- add options input type with selectable pill buttons in UI
- extend seed script parser to handle YAML list properties (options)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

seed/tasks/convert-audio/TASK.md

@@ -1,12 +1,13 @@
 ---
-name: Convert To MP3
-description: Convert audio files to MP3 320kbps, preserving metadata.
+name: Convert Audio
+description: Convert audio files between formats, preserving metadata.
 version: 1
 mode: script
 language: bash
 triggers:
   - type: file
     extensions:
+      - mp3
       - flac
       - wav
       - ogg
@@ -26,6 +27,17 @@ inputs:
   file_path:
     type: string
     description: Path to an audio file or directory to convert.
+  target_format:
+    type: string
+    description: Target format
+    default: mp3
+    options:
+      - mp3
+      - flac
+      - wav
+      - ogg
+      - aac
+      - opus
   delete_source:
     type: boolean
     description: Delete source files after successful conversion.
@@ -33,7 +45,7 @@ inputs:
 args: [file_path]
 ---
 
-# Convert To MP3
+# Convert Audio
 
-Convert audio files to MP3 320kbps using ffmpeg, preserving metadata.
+Convert audio files between formats using ffmpeg, preserving metadata.
 Supports single file conversion and batch directory conversion.

seed/tasks/convert-audio/run.sh

@@ -1,11 +1,26 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# ── Task: Convert To MP3 ──
+# ── Task: Convert Audio ──
 
-EXTENSIONS="flac|wav|ogg|wma|aac|m4a|opus|aiff|aif|ape|wv|alac|dsf|dff"
+EXTENSIONS="mp3|flac|wav|ogg|wma|aac|m4a|opus|aiff|aif|ape|wv|alac|dsf|dff"
+TARGET_FORMAT="${INPUT_TARGET_FORMAT:-mp3}"
 DELETE_SOURCE="${INPUT_DELETE_SOURCE:-false}"
 
+ffmpeg_args_for_format() {
+  case "$1" in
+    mp3)  echo "-codec:a libmp3lame -b:a 320k -id3v2_version 3" ;;
+    flac) echo "-codec:a flac" ;;
+    wav)  echo "-codec:a pcm_s16le" ;;
+    ogg)  echo "-codec:a libvorbis -q:a 6" ;;
+    aac)  echo "-codec:a aac -b:a 256k" ;;
+    opus) echo "-codec:a libopus -b:a 192k" ;;
+    *)    echo "Unsupported format: $1" >&2; return 1 ;;
+  esac
+}
+
+FFMPEG_ARGS=$(ffmpeg_args_for_format "$TARGET_FORMAT") || exit 1
+
 process_file() {
   local input="$1"
   local ext="${input##*.}"
@@ -13,10 +28,10 @@ process_file() {
   dir="$(dirname "$input")"
   local base
   base="$(basename "$input" ".$ext")"
-  local output="$dir/$base.mp3"
+  local output="$dir/$base.$TARGET_FORMAT"
 
-  if [[ "${ext,,}" == "mp3" ]]; then
-    echo "Skipping (already MP3): $input"
+  if [[ "${ext,,}" == "$TARGET_FORMAT" ]]; then
+    echo "Skipping (already $TARGET_FORMAT): $input"
     return 0
   fi
 
@@ -26,7 +41,8 @@ process_file() {
   fi
 
   echo "Converting: $input → $output"
-  if ffmpeg -nostdin -i "$input" -codec:a libmp3lame -b:a 320k -map_metadata 0 -id3v2_version 3 -y "$output" 2>/dev/null; then
+  # shellcheck disable=SC2086
+  if ffmpeg -nostdin -i "$input" $FFMPEG_ARGS -map_metadata 0 -y "$output" 2>/dev/null; then
     echo "  Done"
     if [[ "$DELETE_SOURCE" == "true" ]]; then
       rm "$input"