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VFW_E_DVD_NOT_IN_KARAOKE_MODE
Meaning
Windows documents VFW_E_DVD_NOT_IN_KARAOKE_MODE as “The current audio is not karaoke content”. Here, a karaoke-specific audio presentation operation is requested while the current title is not karaoke content.
Evidence worth preserving
- Evidence 1: DVD_TITLE_APPMODE for the current title.
- Evidence 2: karaoke-mode notification events.
- Evidence 3: requested channel-mixing operation.
Relevant contract
Code-specific boundary: VFW_E_DVD_NOT_IN_KARAOKE_MODE narrows the investigation to the current DVD domain/mode before invoking a karaoke-specific operation. Preserve the DVD domain, title/menu location and graph topology from the same attempt so a later navigation error is not mistaken for the original condition.
Start with the DVD Navigator, graph builder, decoder inventory and renderer topology.
Conditions that can produce it
- Cause 1: the title attributes do not mark karaoke mode.
- Cause 2: playback moved from a karaoke title to ordinary content.
- Cause 3: the UI exposes auxiliary-channel controls for every disc.
Correction strategy
- Action 1: show karaoke controls only for titles that advertise karaoke mode.
- Action 2: reset auxiliary-channel UI on title changes.
- Action 3: query title attributes before applying karaoke presentation settings.
Example incident
A player retains vocal-channel controls after returning to a normal movie title; clearing them on title change prevents it.
Retry and recovery
Retry rule: Retry after a karaoke title becomes current and its mode is confirmed.
How it differs from nearby results
VFW_E_DVD_NO_ATTRIBUTES can mean stream metadata is absent, while it specifically rejects a karaoke-only operation for non-karaoke content.
Official Microsoft references
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