All Input HD MPEG2/MPEG4 4:2:2 Encoder 608/708 Captioning 

Description

Broadcast video transport encoder with multiple inputs and closed captioning support. Intended for program transport over IP or ASI links. Closed captioning support is provided for 608CC on CVBS input or 708CC on HD-SDI input. Closed captioning signal is decoded when used with H-IRD-V3 decoders. Encodes as MPEG2 or MPEG4-H.264,Chroma 4:2:0, 4:2:2 (for MPEG-2 encoding);4:2:0 (for MPEG-4 AVC/H.264 encoding)

https://www.satellitedish.com/H-MPEG2-H264-E.pdf