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VFW_E_DVD_TOO_MANY_RENDERERS_IN_FILTER_GRAPH
Meaning
Windows documents VFW_E_DVD_TOO_MANY_RENDERERS_IN_FILTER_GRAPH as “The DVD Graph Builder cannot build a DVD playback filter graph if the EVR and another renderer are in the graph builder's filter graph”. Here, the DVD graph builder finds both EVR and another video renderer in the filter graph and therefore cannot build a valid DVD playback topology.
Relevant contract
This result belongs to the legacy DirectShow DVD Navigator contract. DVD state is authored and stateful: domains, user-operation controls, titles, menus, streams, command objects and graph construction each impose different preconditions.
Start with the DVD Navigator, graph builder, decoder inventory and renderer topology.
Conditions that can produce it
- Cause 1: the application pre-adds multiple renderers.
- Cause 2: an earlier render attempt left a renderer in the graph.
- Cause 3: custom graph code and IDvdGraphBuilder both insert renderer branches.
Evidence worth preserving
- Evidence 1: complete filter list before RenderDvdVideoVolume.
- Evidence 2: renderer CLSIDs and connected pins.
- Evidence 3: graph-builder flags and prior cleanup results.
Correction strategy
- Action 1: remove all unintended renderers before DVD graph construction.
- Action 2: give one component ownership of renderer selection.
- Action 3: recreate the graph when partial build cleanup is uncertain.
Retry and recovery
Retry rule: Retry after the graph contains only the intended renderer topology.
Example incident
An application adds EVR manually but leaves a default Video Renderer from preview setup; removing the extra renderer clears it.
How it differs from nearby results
VFW_E_DVD_NON_EVR_RENDERER_IN_FILTER_GRAPH is specifically tied to requesting EVR-only mode with a non-EVR renderer present; this code reports the broader multiple-renderer conflict.
Official Microsoft references
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