Burn-in is a popular name for subtitles keyed onto video, meaning that the subtitles are stored on the video, like old times, stored on the celluloid film or today on a video server. Today’s in-vision means that the subtitles are keyed onto the video “last minute” before distribution. For the end user burn-in and in-vision looks the same, it’s a subtitle that is there and can not be taken away.
Cavena has solutions to handle all cases with burn-in or in-vision.
Among others the Cavena Cimpress is a unit including time code reader, graphics insertion and software. The Cimpress connects to the STU. The Cimpress in downstream key mode is installed between an SDI video source and an SDI recorder such as VTRs or servers. The output of the source is connected to the time code reader for VITC and another feed to the graphics board.
And in off-line mode the Cavena Burn-in program makes it is possible to insert subtitles directly into a video file in browse quality. The output of the procedure is a WMV file with subtitles in the picture.
In many countries the subtitles are off-line recorded to the video material in VBI form, teletext or Line 21 data. When the program is transmitted this data is transmitted along with it and decoded and displayed in the receivers. In some cases this is also used as a source of data which is transcoded during play-out into other subtitle formats.