What does HRESULT 0xC00D1BAE (NS_E_END_OF_TAPE) mean?

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Constant name:

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Description:

Either the end of the tape has been reached or there is no tape. Check the device and tape.%0

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NS_E_END_OF_TAPE

How to interpret the code in a real encoding session

0xC00D1BAE is named NS_E_END_OF_TAPE. Its practical scope is tape transport reaches the recorded end or no usable tape is present, which belongs to tape-device control and edit decision lists rather than to every part of Windows Media playback or Windows itself.

Mechanism and point of failure

Windows Media Encoder device control coordinates a capture source with a control plug-in, tape transport, mark-in/mark-out entries and an edit decision list in a session that returns this result. The capture device and the control device must refer to the same usable hardware path.

Video capture can remain available while the separate control plug-in loses transport control, so a device-control failure is not automatically a capture-format failure in a session that returns this result. A typical reproduction is: the final EDL entry extends beyond the recorded segment. This makes the first result from the Encoder more valuable than a later generic message.

Reproduction matrix

Field	What to preserve
Decisive values	transport state, tape-present flag, current timecode and requested EDL range
Producing object	control plug-in CLSID, controlled device identifier, transport state, tape presence, EDL entry count, mark-in/mark-out values, seek result, source-group binding and disconnect event
Session correlation	the same source-group generation, audience index, object identity and callback sequence that produced this result
Lower-level evidence	the first COM, driver, file-system or codec HRESULT observed before the Encoder mapped the condition to this result
Controlled comparison	a known-good session that changes only the setting named in the end of tape boundary

Evidence matrix

Observation	How to interpret it
Observation that supports it	The decisive evidence is transport state, tape-present flag, current timecode and requested EDL range. It confirms tape transport reaches the recorded end or no usable tape is present in the same object generation.
Observation that points to an earlier failure	The recorded values satisfy the end of tape rule, but a source, driver, COM activation or file operation returns a different HRESULT first.
Observation that points to a later failure	The Encoder passes this boundary (tape transport reaches the recorded end or no usable tape is present), but a codec, archive or broadcast sink then fails in a subsequent stage.
Verification after correction	Apply this isolated change: load the correct tape or shorten the EDL to recorded material. The original end of tape call should then advance past the same checkpoint.

The operational impact of it is limited to the tape-device control and edit decision lists transition that owns tape transport reaches the recorded end or no usable tape is present. In the representative case where the final EDL entry extends beyond the recorded segment, keep the first failing call and its object identity so a later wrapper cannot replace the end of tape evidence.

Minimal experiment

Record 0xC00D1BAE, it, the Encoder version and the exact API call or property access that returned it.
Export the current .wme or .prx configuration, then capture transport state, tape-present flag, current timecode and requested EDL range.
verify the tape-device control and edit decision lists precondition without changing the source, profile and output sink at the same time.
Run one controlled comparison in which only this condition changes: load the correct tape or shorten the EDL to recorded material.
After the change, recreate the affected Encoder object rather than assuming the existing graph discarded its earlier end of tape state.

Do not collapse these results together

Result	Why it is a different boundary
`NS_E_ACTIVE_SG_DEVICE_CONTROL_DISCONNECTED`	the control device for the active source group disconnects while capture is active
`NS_E_INVALID_SOURCE_WITH_DEVICE_CONTROL`	device control is attached to a source that is not a capture device
`NS_E_TOO_MANY_DEVICECONTROL`	more than one control plug-in attempts to own the same encoding device

What to change—and what to leave alone

Change the smallest responsible precondition: load the correct tape or shorten the EDL to recorded material. While retesting it, keep all unrelated source, audience and output values fixed until the same call is repeated.

Do not rewind, eject or overwrite the tape before recording the failing EDL entry and current timecode; that changes the evidence used to reproduce the seek or end-of-tape condition in a session that returns it.

Authoritative documentation

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