user15971: I'm trying to retrieve and decode V-chip data from my TV streams (NTSC/ATSC digital streams). Apparently these data are embedded somewhere in the stream itself, but I have no clue how they are embedded inside, if they are inside visual frames, or a different hidden channel.
How are they embedded in the stream? And how can I retireve these data? Is there a software tool to get those signals? I need to do this programmatically in code.

user14523: 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. 

15971: <p>I'm trying to retrieve and decode V-chip data from my TV streams (NTSC/ATSC digital streams). Apparently these data are embedded somewhere in the stream itself, but I have no clue how they are embedded inside, if they are inside visual frames, or a different hidden channel.</p>

<p>How are they embedded in the stream? And how can I retireve these data? Is there a software tool to get those signals? I need to do this programmatically in code.</p>
 14523: <p>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.</p>

<ul>
<li><strong>Analog:</strong> Encoded with the captions on line 21 field 2.</li>
<li><strong>SD SDI:</strong> Probably also on line 21 field 2.</li>
<li><strong>HD SDI:</strong> On <a href="https://www.smpte.org/sites/default/files/section.../2014_July_Closed_Captioning.pptx" rel="nofollow noreferrer">line 9</a> of the HANC encoded as per SMPTE ST 334.</li>
<li><strong>ATSC over the air:</strong> In the <a href="https://evertz.com/resources/eia_608_708_cc.pdf" rel="nofollow noreferrer">DTVCC transport channel</a>.</li>
<li><strong>In a file:</strong> <a href="http://bento.cdn.pbs.org/hostedbento-prod/filer_public/2013/04/18/kudrle_cc_ancillarydata_v03.pdf" rel="nofollow noreferrer">It depends on the wrapper</a>.</li>
</ul>

<p>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. </p>
