IltmmMediaInfo::get_VideoCompression

#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 at http://msdn.microsoft.com/archive/default.asp?url=/library/en-us/directshow/htm/howtoregisterafourcc.asp.

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 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 Also known as a decoder, this is a module or algorithm to decompress data. before you can play (see) it..

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.

See Also

Elements:

IltmmMediaInfo::get_VideoFrameRate, IltmmMediaInfo::get_VideoWidth, IltmmMediaInfo::get_VideoHeight, IltmmMediaInfo::get_VideoBitRate, IltmmMediaInfo::get_VideoBitCount, IltmmMediaInfo::get_VideoFrames, IltmmMediaInfo::get_StreamTypeName, IltmmMediaInfo::get_StreamSubtypeName, IltmmMediaInfo::get_StreamMediaType, IltmmMediaInfo::put_CurrentStream, IltmmMediaInfo::get_CurrentStream, IltmmMediaInfo::get_StreamSubtype, IltmmMediaInfo::get_StreamType, IltmmMediaInfo::get_OutputStreams, IltmmMediaInfo::get_StreamDuration

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++.