Support for External Audio Tracks (.m4a, .mp3, .aac)

Describe your suggested feature

Description

​Currently, Cloudstream allows users to select external subtitles, but there is no native support for loading external audio files. Adding this feature would greatly enhance the experience for users who have high-quality dubs or commentary tracks stored locally.

​Proposed Solution

​Add an option in the player settings (similar to the "Add Subtitles" flow) that allows users to:

​Browse local storage for audio files.

Play audio files directly via URL link (this feature is also available in mpvNova)

​Sync the external audio with the current video stream.

​Switch between the embedded stream audio and the loaded external file.

​Use Case

​Watching content with a preferred language track not included in the original stream.

​Using high-quality localized dubs from community sources.

​Fixing audio issues in streams by providing a local backup.

​Additional Context

​Supported Formats: .mp3, .m4a, .aac, .ogg.

​UI Suggestion: A "Load External Audio" button within the Audio/Subtitle track selection menu.

Other details

No response

Acknowledgements

• My suggestion is NOT about adding a new provider
• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.

Start by inspecting the existing external-subtitle flow and the player’s audio/subtitle track selection menu, which the issue identifies as the model for this feature. Done means supporting local .mp3, .m4a, .aac, and .ogg files plus audio URLs, synchronization with the video, and switching between embedded and external tracks.