BSL PRO 4 Manual - Biopac

322 BSL PRO ManualChapter 17Media MenuAvailable in BSL PRO for Windows 7 and Vista —Media functionality allows users to capture and playbackvideo and/or audio with a USB web cam or firewire DV device and synchronize it with physiologicalinformation from an MP device. The key functionality is a strong link between the video and data cursorwhen graphs are being used in post-acquisition mode; changing the selection in the graph window willautomatically jump the video to the time corresponding to the cursor position. The reverse tie is also in placewhere erasing the video will move the data cursor to the corresponding data point in the graph.For synchronized playback of media player with BSL PRO cursor in data view, BIOPAC recommends thatthe users sample the MP unit at least as fast as the video frame rate 30Hz. In this case, any measurementerrors are limited to the basic frame rate error window (1/30 sec). For exact match of Video and Data samples,BIOPAC recommends frame rate 25 fps and acquisition rate 25 samples/second (or its derivatives).Set UpShow Capture ViewerEstablish Sources, Output and Media parameters. Set device type for audio andor/video. Use refresh after connecting a new device to make it a selectable option.Browse using standard file open/save functionality to specify media files. Ifdesired, set a Delay between file segments.Use for video signal directly from a video camera; this option is disabled (grayed)in the record mode when both the Capture video and Capture audio options in theMedia Setup dialog are off.Show Playback Viewer Use to play back media from the disk (stored media files); this option is disabled(grayed) if there is no media assigned to the file.Show Capture Preview This Media Toolbar icon toggles the preview window display state (show/hide);this option is disabled (grayed) in the record mode when both the Capture videoand Capture audio options in the Media Setup dialog are off.Video Playback and Capture preview include a right-mouse contextual menu item “Grab bitmap” which,when selected, generates a Save As dialog to save the current displayed frame as a *.bmp image.Media Notes:: Media capture performance is improved under Windows 7 or Vista OS. If the selected camera dropsframes because of poor performance/low quality, the degree of synchronization will be compromised.Testing indicated the Microsoft Lifecam NX-3000 gave reliable performance with no dropped frames.:: Media functionality is not fully supported in Windows XP.:: Several BSL PRO files can point (link) to the one media file.:: BSL PRO files can link to media files created by other programs. If the media file is shorter or longerthan the BSL PRO files, just align the two files at the start.:: BSL PRO files alignment precision with the media file is user-controlled through the use of a delayfunction that allows a forward or backward time shift.:: BSL PRO files store the location (path) of the media file. This path is editable, so the BSL PRO filecan link to other media files too.:: Media functionality does not support the Autosave file acquisition mode.Visit the online support center at www.biopac.com