Legal broadcasts require closed captions. Good receiver software can extract CEA-608/708 captions from the SDI/HDMI stream and output them as a separate file, embed them into an NLE (non-linear editor) timeline, or display them live.
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Enthusiasts and media archivists use software like or TVHeadend with dual-tuner cards. The software acts as a DVR, receiving multiple broadcast channels simultaneously, stripping out commercials, and building a searchable media library. Legal broadcasts require closed captions