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NS_E_DVD_DEVICE_CONTENTION
Practical scope of NS_E_DVD_DEVICE_CONTENTION
This HRESULT is produced at opening or controlling the DVD drive while another graph/process uses it. NS_E_DVD_DEVICE_CONTENTION belongs to dvd navigator, decoder graph and protection policy, not to an undifferentiated “Windows Media problem.”
Pipeline position
At the NS_E_DVD_DEVICE_CONTENTION checkpoint, dVD playback is built around the DirectShow DVD Navigator, which parses DVD-Video navigation data and exposes separate video, audio and subpicture outputs; Decoder availability, title-domain state, region policy, parental level and copy-protection negotiation are independent checkpoints. The page-specific boundary is opening or controlling the DVD drive while another graph/process uses it.
For NS_E_DVD_DEVICE_CONTENTION, successful reading of files from the DVD volume does not prove that the navigation program, decoder graph or protected output path can be used. In a typical failing run, another player retains the disc and decoder resources.
Reproduction record
| Evidence | Why it matters for device contention |
|---|---|
| Producing object and operation | disc path and media generation, DVD domain, title/chapter, region values for disc/drive/decoder, selected audio/video/subpicture streams, decoder CLSIDs, renderer and display mode, protection negotiation result and first DirectShow HRESULT |
| Decisive observation | drive handle owners, competing playback graph, exclusive state and media generation |
| Generation identity | Record the same disc, device, job or Player operation generation that returned NS_E_DVD_DEVICE_CONTENTION; a reconnect or media change creates a different test. |
| Underlying result | Keep the first device, filesystem, COM, codec, DirectShow, IMAPI or BITS result seen before the Player mapped it to NS_E_DVD_DEVICE_CONTENTION. |
| Controlled comparison | Repeat the producing call after changing only this condition: close the competing graph and recreate the DVD Navigator against the released drive. |
Reading the evidence
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with opening or controlling the DVD drive while another graph/process uses it; correct that state before changing unrelated codecs, drivers or playlists. |
A lower layer failed before NS_E_DVD_DEVICE_CONTENTION | Preserve that earlier HRESULT or device result because NS_E_DVD_DEVICE_CONTENTION may be only the Player-level mapping. |
| The same call passes after one isolated change | The comparison supports the device contention diagnosis rather than a broad installation failure. |
The code changes after retesting NS_E_DVD_DEVICE_CONTENTION | The NS_E_DVD_DEVICE_CONTENTION boundary was passed; diagnose the new HRESULT as the next independent stage. |
NS_E_DVD_DEVICE_CONTENTION scopes the failure to opening or controlling the DVD drive while another graph/process uses it. The presence of NS_E_DVD_DEVICE_CONTENTION does not establish a system-wide media failure; verify its owning operation before changing unrelated Player components.
Verification procedure
- Capture
0xC00D1170,NS_E_DVD_DEVICE_CONTENTION, the exact Player/API operation and the first timestamp at which it appears. - Save drive handle owners, competing playback graph, exclusive state and media generation; do this before ejecting media, reconnecting a device, canceling a job or rebuilding the Player object.
- For
NS_E_DVD_DEVICE_CONTENTION, correlate the result with disc path and media generation, DVD domain, title/chapter, region values for disc/drive/decoder, selected audio/video/subpicture streams, decoder CLSIDs, renderer and display mode, protection negotiation result and first DirectShow HRESULT. - Reproduce once with the original source and destination, then apply only this change: close the competing graph and recreate the DVD Navigator against the released drive.
- Create a fresh operation generation and verify that the original call advances beyond the device contention boundary.
Results that may look similar
| Related result | Different diagnostic boundary |
|---|---|
NS_E_DVD_CANNOT_JUMP | executing a title/chapter/menu jump allowed in the current DVD domain |
NS_E_DVD_NO_VIDEO_MEMORY | allocating renderer surfaces needed by the DVD decode path |
NS_E_DVD_CANNOT_COPY_PROTECTED | rejecting extraction or copying of copy-protected DVD content |
Change the smallest responsible condition
The targeted action is to close the competing graph and recreate the DVD Navigator against the released drive. While retesting NS_E_DVD_DEVICE_CONTENTION, keep unrelated media, device, playlist and network values unchanged.
When verifying NS_E_DVD_DEVICE_CONTENTION, do not bypass region or copy-protection checks; Diagnose the supported playback path by preserving the exact disc, drive, decoder and display connection involved.
References for the NS_E_DVD_DEVICE_CONTENTION boundary
- DVD decoder support in Windows.
- DirectShow filters and DVD Navigator.
- DirectShow DVD error and success codes.
- IDvdControl2 interface.
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