cpospassthru-querypreferredformat.md

description	ms.assetid	title	ms.topic	ms.date	topic_type	api_name	api_type	api_location	ms.custom
The QueryPreferredFormat method retrieves the preferred time format for the stream. This method implements the IMediaSeeking::QueryPreferredFormat method.	8637448f-6b53-4ec9-9671-43bc8b713668	CPosPassThru.QueryPreferredFormat method (Ctlutil.h)	reference	4/26/2023	APIRef kbSyntax	CPosPassThru.QueryPreferredFormat	COM	Strmbase.lib Strmbase.dll Strmbasd.lib Strmbasd.dll	UpdateFrequency5

CPosPassThru.QueryPreferredFormat method

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The QueryPreferredFormat method retrieves the preferred time format for the stream. This method implements the IMediaSeeking::QueryPreferredFormat method.

Syntax

HRESULT QueryPreferredFormat(
   GUID *pFormat
);

Parameters

pFormat

Pointer to a variable that receives a time format GUID.

Return value

Returns the HRESULT value from the connected pin.

Requirements

Requirement	Value
Header	Ctlutil.h (include Streams.h)
Library	Strmbase.lib (retail builds); Strmbasd.lib (debug builds)

See also

CPosPassThru Class

Time Format GUIDs