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Specifying Time Formats

Multimedia data types typically can use time to identify significant positions within their content. Common time formats are milliseconds, tracks, and frames; other less common time formats, such as SMPTE (Society of Motion Picture and Television Engineers) 24, also exist. Time is the format and reference system for waveform-audio, MIDI, and CD audio data. Video supports time even though it is recorded as a sequence of frames (stream) that is typically played at a specific speed. Several macros are available for designating time format.

You can retrieve the current time format for a file or device by using the MCIWndGetTimeFormat macro. You can change the current time format to any other time format supported by a device by using the MCIWndSetTimeFormat macro. Or you can the set the time format to milliseconds or frames by using the MCIWndUseTime or MCIWndUseFrames macros.

Note Noncontinuous formats, such as tracks and SMPTE, can cause the toolbar to behave erratically. For these time formats, you might want to turn off the toolbar by specifying the MCIWNDF_NOPLAYBAR window style when creating an MCIWnd window.


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