Inside Macintosh: QuickTime Components /

Chapter 6 - Sequence Grabber Channel Components / Sequence Grabber Channel Components Reference

Functions / Configuration Functions for Video Channel Components

SGSetFrameRate

The SGSetFrameRate function allows the sequence grabber to specify a video channel's frame rate for recording.

pascal ComponentResult SGSetFrameRate (SGChannel c, 
                                        Fixed frameRate);

c

Identifies the channel connection for this operation.

frameRate

Specifies the desired frame rate. If this parameter is set to 0, use your channel's default frame rate. Typically, this corresponds to the fastest rate that your channel can support.

DESCRIPTION

The SGSetFrameRate function allows the sequence grabber to control a video channel's frame rate. Note that the digitizing hardware may not be able to support the full rate that the sequence grabber specifies. If the rate is too high, operate at the highest rate you can support.

SPECIAL CONSIDERATIONS

Note that this function will not be called when you are recording.

RESULT CODES

paramErr	-50	Invalid parameter value
cantDoThatInCurrentMode	-9402	Request invalid in current mode

SEE ALSO

The sequence grabber can retrieve your channel's current frame rate by calling your SGGetFrameRate function, which is described next.

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