Closed Captioning

A Closed Captioning stream is a data stream hidden inside a video stream which represents the audio portion as text.

Sometimes MPEG2 elementary video streams have closed captioning data embedded in it, such as IEC-608. In such cases the MPEG2 Decoder generates two output streams: Video and Closed Captioning.

In addition, AVI and OGG container formats can have closed captioning data as a separate stream. For instance, an MPEG2 file with closed captioning is converted to an AVI format that will have three streams: Video, Audio and Closed Captioning.

Data Options

• To enable the display of closed captioning data, use ToggleClosedCaptioning.
• To enable the capture of closed captioning data, use ToggleClosedCaptioning.
• To preserve Closed Captioning data during conversion from one format to another, use AllowedStreams to make sure the output format can accept Closed Captioning data.
• To save decoded closed captioning data to file in either TEXT or SRT format, use SetClosedCaptioningTargetFile.