What does HRESULT 0x8004021F (VFW_E_NO_COLOR_KEY_FOUND) mean?

Status / error code:

Category:

Constant name:

Source:

Facility:

Operating System:

Description:

Evidence and retry guidance for no matching color key is available.

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VFW_E_COLOR_KEY_SET	VFW_E_NO_PALETTE_AVAILABLE

VFW_E_NO_COLOR_KEY_FOUND

Meaning and numerical form

VFW_E_NO_COLOR_KEY_FOUND is HRESULT 2147746335 (0x8004021F; signed -2147220961). AllStat records its meaning as “No matching color key is available”. In practical terms, it is returned when DirectShow cannot find a color-key value compatible with the overlay surface and current display state.

The severity bit in 0x8004021F is set, so this result is a failure result rather than a success or informational status. Its facility is 4 (FACILITY_ITF) and its low 16-bit code is 543 (0x021F). Those fields classify the value but do not identify the component instance, call, object or input that produced it.

Where the failure belongs

This result belongs to DirectShow filter-graph processing. DirectShow is a legacy, component-based media pipeline. Graph state, pin transport, negotiated media types, allocators, clocks, samples, renderers and source filters contribute separate contracts to the operation. The decisive condition is this: DirectShow cannot find a color-key value compatible with the overlay surface and current display state. Record the first native producer instead of relying only on a framework exception translated several layers later.

Do not infer from this result alone that reinstalling, rebooting or repeating the whole workflow is appropriate. Because it can cross process and language boundaries, its correction depends on the object identity, lifecycle generation, input and state at the first failing call.

Diagnostic sequence

Capture this result at the first native return and identify the exact object and method.
Confirm that the observed path matches this condition: DirectShow cannot find a color-key value compatible with the overlay surface and current display state.
compare the live state with the method contract before changing configuration.
collect the code-specific evidence listed above and preserve any more specific preceding error.
change one evidence-backed cause at a time, then repeat the smallest operation that can prove the correction.
Add a regression check that distinguishes it from the related outcomes described below.

Likely causes

Possible cause 1 for this HRESULT: all candidate key values collide with existing desktop colors.
Possible cause 2 for this HRESULT: the renderer or driver cannot satisfy the requested key type.
Possible cause 3 for this HRESULT: display-format changes invalidate earlier key-search assumptions.

Evidence to collect

A useful it record includes the native API or interface method, component or CLSID, process and thread IDs, architecture, apartment where relevant, operation correlation ID, elapsed time, input identity, and the first state-changing event before failure. When diagnosing it, preserve IErrorInfo, an inner HRESULT, Win32 status, device event or provider message when available.

Capture 1 for this HRESULT: requested key type, candidate range and driver capabilities.
Capture 2 for this HRESULT: display pixel format and overlay surface format.
Capture 3 for this HRESULT: renderer negotiation trace and graphics-driver version.

Telemetry for this HRESULT should retain types, lengths, hashes, stable opaque identifiers and lifecycle generations while redacting content and credentials. This makes repeated incidents comparable without exposing media content, file paths, device identifiers or credentials.

Correction and retry boundary

Corrective action 1 for this HRESULT: allow the renderer to select from a valid range.
Corrective action 2 for this HRESULT: choose a non-color-key presentation mode when supported.
Corrective action 3 for this HRESULT: re-negotiate after display-mode changes.

Retry guidance for this HRESULT. Retry only after changing the candidate range, display state or renderer; repeating the same search is deterministic. A retry must avoid this hazard: replay obsolete samples, duplicate graph changes or reuse interfaces from an earlier topology generation. It must also preserve the evidence needed to locate the original producer of it.

Practical scenario

A palette-constrained desktop leaves no usable destination key for a legacy overlay; switching render mode avoids it. The result scenario narrows the result to a reproducible contract boundary and supplies a concrete before-and-after test.

Developer and operational guidance

Code handling it should log the failed stage before cleanup, keep ownership and lifecycle transitions explicit, and avoid converting every failure into a generic message. Tests for this HRESULT should cover the primary cause, one adjacent HRESULT and the retry boundary so a future change cannot turn a deterministic contract failure into an uncontrolled loop.

Operational repair for this HRESULT should use supported filter installation, device, graph-building and renderer configuration paths. Avoid unsupported configuration edits or component replacement unless evidence identifies that layer. Retain the original trace and a post-fix trace so the result can be attributed and the change reversed.

Difference from nearby HRESULTs

VFW_E_NO_COLOR_KEY_SET means no key was configured; it means negotiation attempted but found no acceptable value. Keep these outcomes separate in logs, exception mappings, user messages, dashboards and automated retry policy.

Official Microsoft references

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