(no subject)

I’m writing an application to preview video from a camera and capture images when a button pressed.  I’m working with a prototype camera that has the ability to send data to the Mac in 2 formats Component Video - CCIR-601 yuvu and MJPEG Open DML.  Currently the camera captures images at Component Video - CCIR-601 yuvu however to get the full capabilities of the camera such as max resolution and frame rate I need to set the camera to use MJPEG Open DML.  I’ve been using the Sequence Grabber to preview video and capture images however I cannot figure out how to configure the camera from the Sequence Grabber to transmit data in MJPEG Open DML.  Everything I’ve tried has always resulted in the Sequence Grabber using the uncompressed CCIR-601 yuvu.

 

I tried SGSetVideoCompressor but could not find the MJPEG Open DML codec in GetCodecNameList.  I tried SGSetVideoCompressorType which seemed to change the result when calling SGGetVideoCompressorType but didn’t change the actual camera function.

 

I tried configuring the Video Digitizer directly using VDSetCompressionOnOff and VDSetCompression which seemed to change the result when calling VDGetImageDescription but didn’t seem to affect the results returned by Sequence Grabber.

 

Is there any way to configure the Sequence Grabber to use MJPEG Open DML or do I have to forgo using the Sequence Grabber and use the Video Digitizer and call VDCompressOneFrameAsync?

 

Chad Greenebaum

Sterling Tech Software