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_AM_ASFWRITERCONFIG_PARAM enumeration

The _AM_ASFWRITERCONFIG_PARAM DirectShow QASF enumeration type defines filter configuration parameters used in the IConfigAsfWriter2::GetParam and SetParam methods.

Syntax

enum _AM_ASFWRITERCONFIG_PARAM {
  AM_CONFIGASFWRITER_PARAM_AUTOINDEX, 
  AM_CONFIGASFWRITER_PARAM_MULTIPASS, 
  AM_CONFIGASFWRITER_PARAM_DONTCOMPRESS 

};

Constants

  • AM_CONFIGASFWRITER_PARAM_AUTOINDEX
    Indicates whether the WM ASF Writer should automatically create a temporal index after it has completed encoding a file. Set this parameter to FALSE if you want to create a frame-based index using the Windows Media Format SDK directly.

  • AM_CONFIGASFWRITER_PARAM_MULTIPASS
    Indicates whether the filter should operate in two-pass mode. See Remarks.

  • AM_CONFIGASFWRITER_PARAM_DONTCOMPRESS
    Indicates that the WM ASF Writer will not attempt to compress the input streams. Use this flag to pack content that is not Windows Media–based into an ASF file.

Remarks

In two-pass mode the filter makes two passes through the file. In the first pass, the filter examines each media stream in its entirety to determine the optimal encoding parameters for the file. The actual encoding is performed in the second pass. Therefore, to create an ASF file in two-pass mode, you must run the graph, wait for an EC_PREPROCESS_COMPLETE event, seek to the beginning of the source file, and then run the graph a second time.

Important   To receive the EC_PREPROCESS_COMPLETE event you must use the DirectShow GetEvent method as demonstrated in the DSCopy sample. The DirectShow WaitForCompletion method will not receive this particular event.

 

Requirements

Header

Dshowasf.h

See also

Configuring Profiles and Other File Properties (QASF)

DirectShow QASF Reference

IConfigAsfWriter2::GetParam

IConfigAsfWriter2::SetParam