System for generating closed captioning compatible with legacy and newer set-top boxes

摘要

A caption formatting method and computing system that receives an input video stream that includes a sequence of input transport stream packets. The method locates user data in the sequence of input transport stream packets, where the user data includes input caption data compliant with an input caption data format. The method extracts EIA-608 captions and EIA-708 captions from the input caption data, and formats the EIA-608 captions as caption data compliant with SCTE-20 format. The method creates a sequence of output transport stream packets based on the sequence of input transport stream packets, where the sequence of output transport stream packets include the caption data compliant with SCTE-20 format and the input caption data. The method sends an output video stream from the computing device, where the output video stream includes the sequence of output transport stream packets.

主权项

1. A method, comprising:
receiving a broadcast video stream at a computing device, the broadcast video stream comprising a sequence of input transport stream packets; locating user data in the sequence of input transport stream packets, the user data including input caption data compliant with a first Society of Cable Telecommunications Engineers (SCTE) caption transport standard format having an SCTE-21 format; extracting at least one caption having a first caption type defined for analog transmission and at least one caption having a second caption type defined for digital transmission; formatting at least one caption having the first caption type as caption data compliant with a second SCTE caption transport standard format, wherein the at least one caption having the first caption type is an EIA-608 caption extracted from a A/53 (SCTE-21) wrapper in the input caption data; creating a sequence of output transport stream packets based on the sequence of input transport stream packets by inserting the at least one caption having the first caption type, formatted as caption data compliant with a second SCTE caption transport standard having an SCTE-20 format, together with the at least one caption having the second caption type compliant with the first SCTE caption transport standard format from the input caption data, such that the SCTE-21 formatted data appears after the SCTE-20 data in the user data; and sending an output video stream from the computing device, the output video stream including the sequence of output transport stream packets.