Microsoft DirectX 9.0


The PlayBackwards method plays backward at the specified speed from the current location.


HRESULT PlayBackwards(
  double dwSpeed,
  DWORD dwFlags,
  IDvdCmd **ppCmd



[in] Value that specifies the speed of backward play. This value is a multiplier, where 1.0 is the authored speed. So, a value of 2.5 plays backward at two and one-half times the authored speed, while a value of 0.5 plays backward at half the authored speed. The actual speed of playback depends on the video decoder's capabilities and might differ from the specified rate. For reverse play, audio is muted and no subpicture is displayed. Any speed below 0.00001 is converted to 0.00001.


[in] Bit flag that contains one or more DVD_CMD_FLAGS enumeration specifying command synchronization options.


[out] Address of a pointer to an IDvdCmd interface that can be used to synchronize DVD commands.

Return Values

Returns one of the following values.

Return code Description
S_OK Success.
VFW_E_DVD_OPERATION_INHIBITED UOP control prohibits the operation.


This method is demonstrated in the DVDSample application in CDvdCore::Rewind. For playing backwards one frame at a time, use the IVideoFrameStep interface as demonstrated in the sample application in CDvdCore::FrameStep.

The following table shows the Annex J command name to which this method name corresponds, and the domains in which this method is valid.

Annex J Command Name Valid Domains
Backward_Scan DVD_DOMAIN_VideoManagerMenu

See Also