Retrieve and decode V-Chip data from an aired digital TV stream
V-Chip is encoded in the Extended Data Services (XDS) that is part EIA-608 captions. How it is actually transported in/with the video depends the signal type and medium.


Analog: Encoded with the captions on line 21 field 2.
SD SDI: Probably also on line 21 field 2.
HD SDI: On line 9 of the HANC encoded as per SMPTE ST 334.
ATSC over the air: In the DTVCC transport channel.
In a file: It depends on the wrapper.


It can be decoded in software. However, I don't know of any tools that aren't part of something larger, like transcoding, that can do it.