fix(mux): avoid audio codec suffix on split-audio outputs

CHANGELOG.md

@@ -5,6 +5,46 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+## [2.4.0] - 2026-02-03
+
+### Added
+
+- **MonaLisa DRM**: Added MonaLisa DRM support in the core infrastructure
+  - Includes MonaLisa CDM module and decryption path
+  - Suppresses noisy Shaka Packager message specific to MonaLisa decryption
+- **Remote PlayReady CDM**: Added PlayReady CDM support via pyplayready `RemoteCdm`
+  - `serve` now supports PlayReady alongside Widevine
+  - Adds server-side validation improvements for RemoteCDM
+- **DRM Licensing Binary**: Added `ML-Worker` to environment dependency checks for DRM licensing
+- **VPN**: Added Gluetun VPN integration
+  - Improved connection display
+  - Expanded Windscribe support through Gluetun
+- **Audio**: Added codec lists and split muxing
+- **Video**: Detect interlaced scan type from MPD manifests
+- **Documentation**: Expanded configuration docs (CONFIG.md and new docs/* guides)
+
+### Changed
+
+- **Downloader**: Improved `aria2c` performance via singleton manager
+- **Titles**: Use track source attribute for service name in filenames
+- **Remote Auth**: Removed unused `requests.Session`
+
+### Fixed
+
+- **DASH DRM**: Preserve MPD DRM and avoid overwriting from init segments
+  - Added CENC namespace support for PSSH extraction
+- **DASH DVR**: Handle high `startNumber` values in SegmentTimeline
+- **Manifests**: Correct DRM type selection for remote PlayReady CDMs
+- **Downloader**: Correct progress bar tracking for segmented downloads
+- **N_m3u8DL-RE**: Remove duplicate `--write-meta-json` argument causing download failures
+- **Subtitles**: Preserve original sidecar subtitle files
+- **Binaries**: Search subdirectories when locating binaries
+- **Proxies**: Fix WindscribeVPN server authentication and aggregate servers across all locations
+- **Serve**: Correct PlayReady RemoteCDM server validation
+- **API**: Validate `Bearer` prefix before extracting API keys
+
 ## [2.3.1] - 2026-01-22
 
 ### Fixed

unshackle/commands/dl.py

@@ -1800,6 +1800,7 @@ class dl:
 
                 muxed_paths = []
                 muxed_audio_codecs: dict[Path, Optional[Audio.Codec]] = {}
+                append_audio_codec_suffix = True
 
                 if no_mux:
                     # Skip muxing, handle individual track files
@@ -1820,6 +1821,7 @@ class dl:
                         merge_audio = not split_audio
                     else:
                         merge_audio = config.muxing.get("merge_audio", True)
+                    append_audio_codec_suffix = merge_audio
 
                     multiplex_tasks: list[tuple[TaskID, Tracks, Optional[Audio.Codec]]] = []
 
@@ -2055,7 +2057,7 @@ class dl:
                         final_dir = config.directories.downloads
                         final_filename = title.get_filename(media_info, show_service=not no_source)
                         audio_codec_suffix = muxed_audio_codecs.get(muxed_path)
-                        if audio_codec_suffix:
+                        if audio_codec_suffix and append_audio_codec_suffix:
                             final_filename = f"{final_filename}.{audio_codec_suffix.name}"
 
                         if not no_folder and isinstance(title, (Episode, Song)):