To Use Profiles with the Writer

The writer uses profile data to create ASF files. You must specify a profile for use before doing anything else with the writer.

You can set a system profile for use with the writer by passing the profile ID to the IWMWriter::SetProfileByID method.

To specify a custom profile for use with the writer, you must obtain an IWMProfile interface to an object containing the desired profile data. You can use one of the loading methods of the IWMProfileManager interface to accomplish this. After you have a valid IWMProfile interface, you can pass a pointer to it to the IWMWriter::SetProfile method. For more information about profile settings, see Working with Profiles.

If you make changes to the profile object by using the IWMProfile interface after setting the profile in the writer, you must call SetProfile again, or else the changes will not be reflected in the writer. However, calling SetProfile will reset all header attributes, so be sure to set any required header attributes after calling this method.

The following example function sets the profile to "Windows Media Video 8 for Dial-up Modems (56 Kbps)":

#include <wmsysprf.h>

HRESULT SetProfileExample()
  IWMWriter *pWriter = NULL;
  hr = WMCreateWriter(NULL, &pWriter);
  if (FAILED(hr)) return hr;
  hr = pWriter->SetProfileByID(WMProfile_V80_56Video);
  return hr;


There are no predefined system profiles that use the Windows Media Audio and Video 9 Series codecs. For more information, see Reusing Stream Configurations.



Working with Profiles

Writing ASF Files