Why format and audio identifiers belong to one analysis
Format and audio identifiers are server-issued selections tied to a particular analysis. They are not source URLs, language names or commands. Use the choices returned by the current session; supplying another video’s identifier cannot unlock a format or language absent from the source.
Open the relevant downloader · Platform tools and access limits
A label is not the stream itself
Two separate videos may both display 360p or English, but the backend stores different source URLs and stream indexes for them. A friendly label describes a selection; its opaque ID identifies a stored option. The association matters when selecting multiple audio tracks.
The source-facing format information remains behind the normalized provider interface. Public tool pages all use that interface rather than maintaining separate extraction logic. It prevents a frontend page from constructing an arbitrary provider command or selecting a stream that was never analyzed.
What the request is allowed to select
A download request identifies the session, a returned format, an audio mode and the selected audio-track IDs. Single mode needs one valid track when an audio inventory exists. Dual mode needs two compatible distinct-language choices; duplicate IDs and duplicate known-language choices are rejected.
The backend resolves the stored IDs to local input planning, applies its existing network safeguards, and explicitly maps selected audio indexes. The browser does not submit a raw ffmpeg argument or an upstream media URL as a substitute for a reviewed selection.
Troubleshoot unavailable selections
A track-unavailable response can mean the session has expired, the source has changed, or the chosen audio is incompatible with the selected quality. Run a fresh check and choose its returned options. Switching quality may require a different audio choice or a return to Single Audio mode.
Do not edit an ID to resemble a language code or copy one from a different tab. Such changes should fail rather than silently select default audio. A truthful failure is preferable to a file mislabeled as the requested language. No ID manipulation provides access to private content or creates translated speech.
Worked example
Session A offers English track audio-1; session B offers a different source with an opaque identifier that happens to be similarly named. A request referencing B must use B’s returned inventory. Combining A’s selection with B’s session is invalid even though both sources visibly claim the same language.
Related guidance
Sources and verification
Reviewed 2026-10-07. Product behavior is limited to available source formats and provider access; it is not a promise that every public link works.