The portion of the file holding the video data. The video data might be compressed to save disk space. The data has to be decompressed using a video decompressor before you can play (see) it.

Also known as a decoder, this is a module or algorithm to decompress data.

IltmmMediaInfo::get_VideoCompression

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#include "ltmm.h"

C Syntax	HRESULT IltmmMediaInfo_get_VideoCompression(pMediaInfo, Compression)
C++ Syntax	HRESULT get_VideoCompression(Compression)

IltmmMediaInfo *pMediaInfo;	/* pointer to an interface */
long * Compression;	/* pointer to a variable */

Retrieves the type of compression used for the current stream in the current source media file.

Parameter	Description
pMediaInfo	Pointer to an IltmmMediaInfo interface.
Compression	Pointer to a variable that receives the type of compression. Video compression type is indicated by a FOURCC value. For a list of FOURCC values, refer to the Microsoft documentation on FOURCC numbers.

Returns

S_OK	The function was successful.
<> S_OK	An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.

Comments

This function will fail if the current stream is not a video stream .

The current source media file, set using IltmmMediaInfo::put_SourceFile, is the file for which the IltmmMediaInfo interface/object gets information. IltmmMediaInfo::put_SourceFile must be called before calling any of the other IltmmMediaInfo functions used for retrieving information.

To set the current stream, call IltmmMediaInfo::put_CurrentStream.

Required DLLs and Libraries

LTMM

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64

See Also

Elements:

Topics:

Multimedia Function Group
Media File Information

Example

For a C example, refer to Retrieving Media File Information for C.

For a C++ example, refer to Retrieving Media File Information for C++.