TIEMediaFoundationSourceReader.StartCapture

Declaration

function StartCapture(EnableVideoFormatRGB32: Boolean = True): boolean;

Description

Start capturing of the sample. Applications can stop capturing by calling StopCapture.
If EnableVideoFormatRGB32=true, RGB32 will be added as a desired video format. This may be required for unsupported formats, like MJPG, but causes a significant lag when initializing the capture.
Returns True on success.

Example

ImageEnView1.IO.MediaFoundationSourceReader.SelectMediaType( mmf_VIDEO_STREAM, lbxVideoFormat.ItemIndex );

// Show cam image as a mirror
ImageEnView1.IO.MediaFoundationSourceReader.VideoProcessor.SetMirror( mfpmHorizontal );

// Enable Auto-rotation
ImageEnView1.IO.MediaFoundationSourceReader.VideoProcessor.SetRotation( mfprNormal );

// Start the capturing
ImageEnView1.IO.MediaFoundationSourceReader.StartCapture( False ); // Don't need to set to RGB32 as selected media type above

// Get actual video format
mt := ImageEnView1.IO.MediaFoundationSourceReader.GetCurrentMediaType(mmf_VIDEO_STREAM);
lblVideoFormat.Caption := Format( 'Actual video format: %d x %d   %.1f fps   %s',
                                  [ mt.GetInteger(IEFRAMEWIDTH_DICT_KEY),    // width
                                    mt.GetInteger(IEFRAMEHEIGHT_DICT_KEY),   // height
                                    mt.GetDouble(IEFRAMERATE_DICT_KEY),      // frame rate
                                    mt.GetString(IESUBTYPE_DICT_KEY)         // subtype = color space
                                    ]);

TIEMediaFoundationSourceReader.StartCapture