add: WebDL / TVRip media types and filename-token override

Source kind is now declared per-file via a `dvd` / `bluray` / `webdl` /
`tvrip` token in the basename (case-insensitive, word-bounded). Matches
the existing `tt…` / `tvm…` filename convention. When no token is
present, falls back to the pixel-count guess in DetectMediaType, which
still only chooses between DVD and Blu-ray.

The parsed media type drives both ORIGINAL_MEDIA_TYPE in the muxed
metadata and the CRF/preset profile used for encoding. EncodingConfig
gains `webdl` and `tvrip` sub-blocks with conservative defaults
(WebDL 30/3, TVRip 32/2); user can override in config.yaml.

Manual updated with the new tokens, config fields, and pipeline
description.

MANUAL.md

@@ -48,6 +48,12 @@ encoding:
   bluray:
     crf: 29
     preset: 3
+  webdl:
+    crf: 30
+    preset: 3
+  tvrip:
+    crf: 32
+    preset: 2
 
 paths:
   input:     "./input"
@@ -65,6 +71,10 @@ paths:
 | `encoding.dvd.preset` | SVT-AV1 preset for SD sources | `2` |
 | `encoding.bluray.crf` | SVT-AV1 CRF for HD sources | `29` |
 | `encoding.bluray.preset` | SVT-AV1 preset for HD sources | `3` |
+| `encoding.webdl.crf` | SVT-AV1 CRF for WebDL sources | `30` |
+| `encoding.webdl.preset` | SVT-AV1 preset for WebDL sources | `3` |
+| `encoding.tvrip.crf` | SVT-AV1 CRF for TVRip sources | `32` |
+| `encoding.tvrip.preset` | SVT-AV1 preset for TVRip sources | `2` |
 | `paths.input` | Folder polled for new `.mkv` files | `./input` |
 | `paths.output` | Destination for finished encodes | `./output` |
 | `paths.originals` | Where source files are moved on success (unless `-d`) | `./originals` |
@@ -131,6 +141,27 @@ the-wire.TVM75.s2e5.mkv
 
 If neither pattern matches, encoding still proceeds but the file is treated as having no metadata. The output is named with a random hex string and an `.nometadata.mkv` suffix.
 
+### 5.4 Optional: source media type
+
+Any filename can additionally contain a media-type token (case-insensitive, word-bounded):
+
+- `dvd`
+- `bluray`
+- `webdl`
+- `tvrip`
+
+Examples:
+
+```
+Heat.tt0113277.bluray.mkv
+some-rip.tvm169.S01E01.webdl.mkv
+old.broadcast.tvrip.tt0066026.mkv
+```
+
+The token controls **both** the `ORIGINAL_MEDIA_TYPE` metadata tag written into the output and which `encoding.<type>.crf` / `encoding.<type>.preset` pair is used.
+
+If no token is present, the program falls back to guessing from pixel count: `width × height < 600,000` → DVD, otherwise Blu-ray. WebDL and TVRip are never auto-detected — they must be declared via the token.
+
 ---
 
 ## 6. The processing pipeline
@@ -143,10 +174,10 @@ For every `.mkv` found in `paths.input`, the program runs these steps in order.
    - Records width, height, and sample aspect ratio (SAR).
    - Runs `ffmpeg -vf idet` to detect interlacing (presence of `TFF`/`BFF` in stderr).
 3. **Probe stream languages** with `ffprobe` — collects `language` tags for every audio/subtitle stream so they can be re-applied after encoding (FFmpeg's `-map_metadata -1` strips them otherwise).
-4. **Detect media type** from pixel count:
-   - `width × height < 600,000` → **DVD** profile.
-   - Otherwise → **Blu-ray** profile.
-   The chosen profile selects which CRF/preset pair from the config to use.
+4. **Detect media type**:
+   - First, check the filename for a `dvd` / `bluray` / `webdl` / `tvrip` token (case-insensitive). If present, that wins.
+   - Otherwise, fall back to pixel count: `width × height < 600,000` → DVD, else Blu-ray.
+   The chosen profile selects which `encoding.<type>.crf` / `encoding.<type>.preset` pair from the config to use, and is written into the `ORIGINAL_MEDIA_TYPE` metadata tag.
 5. **Fetch metadata** from OMDb or TVmaze depending on the parsed filename. Failures here are logged but do not abort the encode — the file is just encoded without metadata.
 6. **Extract audio** to `audio.wav` (PCM s16le, 48 kHz) in the input directory.
 7. **Encode audio** with `opusenc --bitrate 128k` → `audio.opus`.