feat: harden pos media mp3/mp4 — smart format selection, metadata, dry-run

Both tools: yt-dlp calls via spawn (honor DRY_RUN; --dry-run prints the
command and skips dep checks), -o/--output, --no-playlist, --cookies (with
file check), clean ffmpeg/yt-dlp guards, POS_FLAGS for completion, full
embedded metadata (--embed-metadata --embed-chapters --embed-thumbnail
--no-overwrites; mp3 adds --convert-thumbnails jpg + artist-from-uploader
parse-metadata). mp3 gains --by-artist (~/Music/<artist>/<title>.mp3).

mp4: -f <id>/--best/--worst skip the prompt (mutual-exclusion validated),
and the interactive picker now shows a curated [audio]/[video]/[combo]
format table on stderr (stdout carries only the chosen id — ui_pick
lesson), validates the id against the real -F output, and defaults empty
input to best. Docs: howto/media.md rewritten.

AGENT_TODO.md

@@ -16,6 +16,8 @@ summary (newest last).
 
 ## Done
 
+- **2026-08-09** — `pos media mp3`/`mp4` hardened + smart format selection. Both tools: yt-dlp calls go through `spawn` (honor `$DRY_RUN`; `--dry-run` prints the exact command and skips dep checks), `-o/--output`, `--no-playlist`, `--cookies` (file existence check), clean ffmpeg/yt-dlp guards, `# POS_FLAGS:` for completion, full metadata (`--embed-metadata --embed-chapters --embed-thumbnail --no-overwrites`, mp3 also `--convert-thumbnails jpg` + `--parse-metadata "%(artist,uploader)s:%(artist)s"` so the uploader fills the artist tag). mp3 gains `--by-artist` (`~/Music/<artist>/<title>.mp3`). mp4 gains `-f <id>` / `--best` / `--worst` (no prompt), conflict validation, and an interactive picker that shows a **curated** `-F` table (`[audio]`/`[video]`/`[combo]` grouping, raw clutter dropped) on stderr — stdout carries only the chosen id (ui_pick lesson) — with id validation against the real table and empty/best default. Docs: howto/media.md rewritten (flags, metadata, by-artist, troubleshooting); `make gen && make check` green.
+
 - **2026-08-09** — Telegram `ai …` now answers about a message you reply to: the listener extracts `reply_to_message.text` (falls back to `caption`) from each update and passes it to `handle_message`; the AI bridge prefixes the prompt with `[Reply context — the message you are replying to]`. So replying to a `/status` output and asking `ai check this details` gives the model the actual output. Applies only to the AI bridge (mapped `/commands` untouched); reply context rides in the user turn so the session records what was analyzed. Docs: howto/ai.md bridge section.
 
 - **2026-08-09** — `pos ai gemini` sessions + Telegram-friendly replies. `--session <name>` gives `ask`/`chat` persistent memory (`~/.local/share/linux_post_install/ai/<name>.json`, capped at 40 turns, pruning keeps the first user turn as scene); new `sessions` subcommand (list / `reset <name>`). Telegram listener now keeps one session per chat (`telegram-<chat_id>`) with `ai /reset` to clear. New `--system "<text>"` flag injects a Gemini `systemInstruction` (via `jq` merge) sent every turn but never stored in the session file; the listener passes a Telegram-voice prompt ("reply like a friendly Telegram chat, use emojis") and strips markdown (`**`, `*`, backticks, `#`, links, lists, blockquotes) from replies before `sendMessage`, since messages go out as plain text. Docs: howto/ai.md (flags, sessions, bridge memory/formatting), `make gen && make check` green.

DOC/AGENT_Context_Project.md

@@ -72,7 +72,7 @@ Linux_post_install/
 │   ├── pos-entertainment-send              # Run a public-API plugin and send its output via Telegram (default sender)
 │   ├── pos-entertainment-status            # Show enabled plugins and scheduler state
 │   ├── pos-media-mp3                       # Download audio as MP3 (yt-dlp)
-│   ├── pos-media-mp4                       # Download video as MP4 (interactive format select)
+│   ├── pos-media-mp4                       # Download video as MP4 (smart/interactive format select)
 │   ├── pos-network-checkport               # Check TCP port connectivity
 │   ├── pos-network-hotspot                 # Wi-Fi hotspot via create_ap + wihotspot-gui
 │   ├── pos-network-ip                      # Show interfaces, routes, public IP + location
@@ -267,7 +267,7 @@ All non-interactive `pos` commands log output to `~/.local/share/linux_post_inst
 | entertainment | send | `pos-entertainment-send` | Run a public-API plugin and send its output via Telegram (default sender) |
 | entertainment | status | `pos-entertainment-status` | Show enabled plugins and scheduler state |
 | media | mp3 | `pos-media-mp3` | Download audio as MP3 (yt-dlp) |
-| media | mp4 | `pos-media-mp4` | Download video as MP4 (interactive format select) |
+| media | mp4 | `pos-media-mp4` | Download video as MP4 (smart/interactive format select) |
 | network | checkport | `pos-network-checkport` | Check TCP port connectivity |
 | network | hotspot | `pos-network-hotspot` | Wi-Fi hotspot via create_ap + wihotspot-gui |
 | network | ip | `pos-network-ip` | Show interfaces, routes, public IP + location |
@@ -573,8 +573,8 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`
 | `bin/pos-entertainment-enable` | 49 | Enable an auto-trigger for a plugin on a schedule |
 | `bin/pos-entertainment-send` | 93 | Run a public-API plugin and send its output via Telegram (default sender) |
 | `bin/pos-entertainment-status` | 49 | Show enabled plugins and scheduler state |
-| `bin/pos-media-mp3` | 35 | Download audio as MP3 (yt-dlp) |
-| `bin/pos-media-mp4` | 38 | Download video as MP4 (interactive format select) |
+| `bin/pos-media-mp3` | 80 | Download audio as MP3 (yt-dlp) |
+| `bin/pos-media-mp4` | 126 | Download video as MP4 (smart/interactive format select) |
 | `bin/pos-network-checkport` | 45 | Check TCP port connectivity |
 | `bin/pos-network-hotspot` | 93 | Wi-Fi hotspot via create_ap + wihotspot-gui |
 | `bin/pos-network-ip` | 69 | Show interfaces, routes, public IP + location |
@@ -587,7 +587,7 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`
 | `bin/pos-system-nfs-server` | 134 | Manage the NFS kernel server (status, share/unshare exports, enable/disable) |
 | `bin/pos-tree` | 110 | Show the pos CLI command tree: categories, commands, and subcommands |
 | `bin/pos-usb-server` | 218 | USB Redirector server control (--ls, --share; prompts when args omitted) |
-| `completions/pos.bash` | 282 | Dynamic bash completion |
+| `completions/pos.bash` | 284 | Dynamic bash completion |
 <!-- GEN:END filetable -->
 | `apps/install.sh` | 171 | App install/uninstall picker/orchestrator |
 

DOC/howto/media.md

@@ -5,10 +5,11 @@ Download audio and video from the web via `yt-dlp`. Tools: `mp3`, `mp4`.
 | Tool | What it does |
 |------|--------------|
 | `pos media mp3` | Download audio, convert to MP3 |
-| `pos media mp4` | Download video with interactive format selection |
+| `pos media mp4` | Download video with smart/interactive format selection |
 
-Requires `yt-dlp` (`sudo apt install yt-dlp`); the tools fail with a clean
-error message instead of a raw `command not found` if it's missing.
+Requires `yt-dlp` and `ffmpeg` (`sudo apt install yt-dlp ffmpeg`); the tools
+fail with a clean error message instead of a raw `command not found` if either
+is missing.
 
 ---
 
@@ -18,43 +19,81 @@ error message instead of a raw `command not found` if it's missing.
 pos media mp3 <url>
 ```
 
-Extracts and converts the audio track to MP3 in the current directory.
+Extracts and converts the audio track to MP3 in `~/Music/`. With `--by-artist`
+files land in `~/Music/<artist>/<title>.mp3` (falls back to the uploader name
+when there's no artist tag), so a library stays organized.
 
 ```bash
 pos media mp3 https://youtube.com/watch?v=dQw4w9WgXcQ
+pos media mp3 --by-artist https://youtu.be/dQw4w9WgXcQ
 ```
 
+MP3s are encoded at best quality with title/artist/album/date/chapters embedded
+(`--embed-metadata --embed-chapters`, artist falls back to uploader) plus the
+cover art as a JPEG thumbnail. Existing files are never overwritten.
+
+| Flag | Meaning |
+|------|---------|
+| `-o, --output <dir>` | Output directory (default `~/Music`) |
+| `--by-artist` | Organize as `<dir>/<artist>/<title>.mp3` |
+| `--no-playlist` | Download only the single video, not the playlist |
+| `--cookies <file>` | Netscape cookies.txt for age-gated content |
+| `--dry-run` | Print the yt-dlp command without running it |
+
 **Recipe:** batch — loop over a list of URLs:
 ```bash
-while read -r url; do pos media mp3 "$url"; done < urls.txt
+while read -r url; do pos media mp3 --by-artist "$url"; done < urls.txt
 ```
 
-**Troubleshooting:** MP3 conversion needs `ffmpeg`; if the tool errors about a
-missing postprocessor, `sudo apt install ffmpeg`. Single-song playlists: use the
-video URL directly, or a playlist entry.
-
 ---
 
-## `pos media mp4` — video with format choice
+## `pos media mp4` — video with smart format choice
 
 ```bash
 pos media mp4 <url>
 ```
 
-Lists the available formats (`yt-dlp -F`) and lets you pick interactively, then
-downloads to the current directory.
+Without a format flag, the available formats are shown as a **short curated
+list** (grouped `[audio]` / `[video]` / `[combo]`, with the raw dump's clutter
+dropped) and you pick one — the id is validated before downloading. Entering
+nothing (or `best`) picks the best video+audio automatically.
+
+Non-interactive (scripting-friendly):
+
+| Flag | Meaning |
+|------|---------|
+| `-f, --format <id>` | Download that format id directly (no prompt) |
+| `--best` | Best video + audio, no prompt |
+| `--worst` | Lowest quality, no prompt |
+| `-o, --output <dir>` | Output directory (default `~/Videos`) |
+| `--no-playlist` | Download only the single video |
+| `--cookies <file>` | Netscape cookies.txt for age-gated content |
+| `--dry-run` | Print the yt-dlp command without running it |
 
 ```bash
-pos media mp4 https://youtube.com/watch?v=dQw4w9WgXcQ
+pos media mp4 --best https://youtube.com/watch?v=dQw4w9WgXcQ
+pos media mp4 -f 22 https://youtube.com/watch?v=dQw4w9WgXcQ
 ```
 
-**Recipe:** grab a 4K stream for later — pick the highest `video only` format +
-best audio; yt-dlp merges them (again needs `ffmpeg`).
+Videos merge to MP4 with metadata, chapters, subtitles (all languages) and the
+thumbnail embedded (`--embed-metadata --embed-chapters --embed-subs
+--sub-langs all --embed-thumbnail`); existing files are never overwritten.
 
-**Troubleshooting:**
-- Format list is empty → the site/age-gate requires cookies/auth; yt-dlp can't
-  access it — use a URL yt-dlp supports, or update yt-dlp (`sudo apt upgrade yt-dlp`).
-- Very large downloads: ensure free space; files land in the current directory.
+**Recipe:** grab a 4K stream for later — `--best` already picks the best
+video+audio and merges them.
+
+---
+
+## Troubleshooting
+
+- Format list is empty / download fails → the site or age-gate requires
+  cookies; pass `--cookies ~/cookies.txt` (export it from your browser), or
+  update yt-dlp (`sudo apt upgrade yt-dlp`).
+- Error about a missing postprocessor → `sudo apt install ffmpeg`.
+- `--by-artist` leaves files loose → the source has no artist/uploader tag;
+  it falls back to the uploader name in the artist slot.
+- Very large downloads: ensure free space; files land in `~/Music`/`~/Videos`
+  (or your `-o` directory).
 
 ---
 

bin/pos-media-mp3

@@ -1,35 +1,80 @@
 #!/usr/bin/env bash
 set -euo pipefail
 # POS: media mp3 — Download audio as MP3 (yt-dlp)
+# POS_FLAGS: --output --no-playlist --cookies --by-artist --dry-run
 
 source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
 
+OUT_DIR="$HOME/Music"
+BY_ARTIST=0
+EXTRA_ARGS=()
+
 usage() {
     cat <<EOF
-Usage: pos media mp3 <url>
+Usage: pos media mp3 [options] <url>
 
 Download audio from a URL and convert to MP3 via yt-dlp.
 
+Options:
+  -o, --output <dir>    Output directory (default: $OUT_DIR)
+  --by-artist           Organize as <dir>/<artist>/<title>.mp3
+  --no-playlist         Download only the single video
+  --cookies <file>      Netscape cookies.txt for age-gated content
+  --dry-run             Print the yt-dlp command without running it
+  -h, --help            This help
+
 Examples:
   pos media mp3 https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media mp3 --by-artist --no-playlist https://youtu.be/dQw4w9WgXcQ
+  pos media mp3 --cookies ~/cookies.txt https://vimeo.com/123
 EOF
     exit 0
 }
 
-case "${1:-}" in
-    -h|--help|"") usage ;;
-esac
+DRY_RUN=0
+URL=""
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -h|--help) usage ;;
+        -o|--output)
+            [ $# -ge 2 ] || err "--output needs a value"
+            OUT_DIR="$2"; shift 2 ;;
+        --by-artist) BY_ARTIST=1; shift ;;
+        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
+        --cookies)
+            [ $# -ge 2 ] || err "--cookies needs a value"
+            [ -f "$2" ] || err "cookies file not found: $2"
+            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
+        --dry-run) DRY_RUN=1; shift ;;
+        -*) err "Unknown option: $1 (see --help)" ;;
+        *)
+            [ -z "$URL" ] && URL="$1" && shift || err "Unexpected argument: $1" ;;
+    esac
+done
+[ -n "$URL" ] || usage
 
-command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
+# Dependency checks (skipped under --dry-run: the command is only previewed).
+if [ "$DRY_RUN" -eq 0 ]; then
+    command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
+    command -v ffmpeg &>/dev/null || err "ffmpeg not found (needed for MP3 conversion) — install it with: sudo apt install ffmpeg"
+fi
 
-url="$1"
+if [ "$BY_ARTIST" -eq 1 ]; then
+    OUT_TEMPLATE="$OUT_DIR/%(artist,uploader)s/%(title)s.%(ext)s"
+else
+    OUT_TEMPLATE="$OUT_DIR/%(title)s.%(ext)s"
+fi
 
-yt-dlp \
-  -x \
-  --audio-format mp3 \
-  --audio-quality 0 \
-  --embed-thumbnail \
-  --convert-thumbnails jpg \
-  --add-metadata \
-  -o "$HOME/Music/%(title)s.%(ext)s" \
-  "$url"
+args=(yt-dlp -x --audio-format mp3 --audio-quality 0
+    --embed-metadata --embed-chapters
+    --embed-thumbnail --convert-thumbnails jpg
+    --parse-metadata "%(artist,uploader)s:%(artist)s"
+    --no-overwrites
+    -o "$OUT_TEMPLATE"
+    "${EXTRA_ARGS[@]}" "$URL")
+
+if [ "$DRY_RUN" -eq 1 ]; then
+    echo "yt-dlp ${args[*]:1}"
+else
+    spawn "downloading audio → $OUT_DIR" "${args[@]}"
+fi

bin/pos-media-mp4

@@ -1,38 +1,126 @@
 #!/usr/bin/env bash
 set -euo pipefail
-# POS: media mp4 — Download video as MP4 (interactive format select)
+# POS: media mp4 — Download video as MP4 (smart/interactive format select)
+# POS_FLAGS: --format --best --worst --output --no-playlist --cookies --dry-run
 
 source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
 
+OUT_DIR="$HOME/Videos"
+FORMAT=""
+BEST=0
+WORST=0
+EXTRA_ARGS=()
+
 usage() {
     cat <<EOF
-Usage: pos media mp4 <url>
+Usage: pos media mp4 [options] <url>
 
-Download video from a URL via yt-dlp with interactive format selection.
+Download video from a URL via yt-dlp. Without -f/--best/--worst, formats are
+listed and picked interactively.
+
+Options:
+  -f, --format <id>     Download that format id directly (no prompt)
+  --best                Best video + audio (no prompt)
+  --worst               Lowest quality (no prompt)
+  -o, --output <dir>    Output directory (default: $OUT_DIR)
+  --no-playlist         Download only the single video
+  --cookies <file>      Netscape cookies.txt for age-gated content
+  --dry-run             Print the yt-dlp command without running it
+  -h, --help            This help
 
 Examples:
   pos media mp4 https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media mp4 --best https://youtube.com/watch?v=dQw4w9WgXcQ
+  pos media mp4 -f 22 https://youtube.com/watch?v=dQw4w9WgXcQ
 EOF
     exit 0
 }
 
-case "${1:-}" in
-    -h|--help|"") usage ;;
-esac
+DRY_RUN=0
+URL=""
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        -h|--help) usage ;;
+        -f|--format)
+            [ $# -ge 2 ] || err "--format needs a value"
+            FORMAT="$2"; shift 2 ;;
+        --best) BEST=1; shift ;;
+        --worst) WORST=1; shift ;;
+        -o|--output)
+            [ $# -ge 2 ] || err "--output needs a value"
+            OUT_DIR="$2"; shift 2 ;;
+        --no-playlist) EXTRA_ARGS+=(--no-playlist); shift ;;
+        --cookies)
+            [ $# -ge 2 ] || err "--cookies needs a value"
+            [ -f "$2" ] || err "cookies file not found: $2"
+            EXTRA_ARGS+=(--cookies "$2"); shift 2 ;;
+        --dry-run) DRY_RUN=1; shift ;;
+        -*) err "Unknown option: $1 (see --help)" ;;
+        *)
+            [ -z "$URL" ] && URL="$1" && shift || err "Unexpected argument: $1" ;;
+    esac
+done
+[ -n "$URL" ] || usage
 
-command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
+[ -n "$FORMAT" ] && { [ "$BEST" -eq 1 ] || [ "$WORST" -eq 1 ]; } \
+    && err "--format and --best/--worst are mutually exclusive"
+[ "$BEST" -eq 1 ] && [ "$WORST" -eq 1 ] && err "--best and --worst are mutually exclusive"
 
-url="$1"
+# Dependency checks (skipped under --dry-run: the command is only previewed).
+if [ "$DRY_RUN" -eq 0 ]; then
+    command -v yt-dlp &>/dev/null || err "yt-dlp not found — install it with: sudo apt install yt-dlp"
+    command -v ffmpeg &>/dev/null || err "ffmpeg not found (needed for MP4 merge) — install it with: sudo apt install ffmpeg"
+fi
 
-yt-dlp -F "$url"
+# Resolve the format selector: explicit flag → smart preset → interactive.
+# The curated table goes to stderr; stdout carries ONLY the chosen format id
+# (same ui_pick lesson — a $(...) capture must not swallow the menu).
+fmt_spec=""
+if [ -n "$FORMAT" ]; then
+    fmt_spec="$FORMAT"
+elif [ "$BEST" -eq 1 ]; then
+    fmt_spec="bestvideo*+bestaudio/best"
+elif [ "$WORST" -eq 1 ]; then
+    fmt_spec="worst"
+else
+    table="$(yt-dlp -F "$URL" 2>&1)" || {
+        echo "ERROR: no formats listed (unsupported site or age-gated content)" >&2
+        exit 1
+    }
+    printf '%s' "$table" | awk -F'[[:space:]][[:space:]]+' '
+        NR <= 2 { print; next }
+        $0 ~ /^-+$/ { print; next }
+        $0 ~ /audio only/ && $0 !~ /storyboard/ && $1 !~ /^sb/ { print "  [audio] " $0; next }
+        $0 ~ /video only/ && $1 !~ /^sb/ { print "  [video] " $0; next }
+        $1 ~ /^[0-9]+$/ && $2 ~ /^(mp4|webm)$/ && $3 ~ /x/ { print "  [combo] " $0 }
+    ' >&2
+    echo >&2
+    read -rp "Format ID ('best'/'worst'/empty = best): " chosen
+    case "${chosen:-best}" in
+        best) fmt_spec="bestvideo*+bestaudio/best" ;;
+        worst) fmt_spec="worst" ;;
+        *)
+            if printf '%s' "$table" | grep -qE "^[[:space:]]*${chosen}[[:space:]]"; then
+                fmt_spec="$chosen"
+            else
+                echo "ERROR: unknown format id '$chosen'" >&2
+                exit 1
+            fi
+            ;;
+    esac
+fi
 
-echo
-read -rp "Enter format ID: " format
+args=(yt-dlp -f "$fmt_spec"
+    --merge-output-format mp4
+    --embed-metadata --embed-chapters
+    --embed-subs --sub-langs all
+    --embed-thumbnail
+    --no-overwrites
+    -o "$OUT_DIR/%(title)s.%(ext)s"
+    "${EXTRA_ARGS[@]}" "$URL")
 
-yt-dlp \
-  -f "$format" \
-  --merge-output-format mp4 \
-  --embed-thumbnail \
-  --add-metadata \
-  -o "$HOME/Videos/%(title)s.%(ext)s" \
-  "$url"
+if [ "$DRY_RUN" -eq 1 ]; then
+    echo "yt-dlp ${args[*]:1}"
+else
+    spawn "downloading video → $OUT_DIR" "${args[@]}"
+fi

completions/pos.bash

@@ -7,6 +7,8 @@ _pos_flags[ai-gemini]="--model --session --system"
 _pos_flags[communication-telegram-listener]="--enable --disable --status --sync-commands --run"
 _pos_flags[communication-telegram-sender]="--type --caption --parse-mode --no-preview --token --chat-id --markdown"
 _pos_flags[entertainment-send]="--print --markdown"
+_pos_flags[media-mp3]="--output --no-playlist --cookies --by-artist --dry-run"
+_pos_flags[media-mp4]="--format --best --worst --output --no-playlist --cookies --dry-run"
 _pos_flags[network-hotspot]="--foreground"
 _pos_flags[system-backup]="--service"
 _pos_flags[tree]="--depth"