On Mon, 2005-10-03 at 15:31 +0100, Illtud Daniel wrote: > Anybody out there with experience of DVB subtitle capture on mythtv? > Does mythtv only do 'live' subtitle decoding from the stream as it > plays With DVB it saves the DVB subtitle data directly in the recording, then decodes the proper language subtitle on playback. With frame grabber cards it decodes the captions/teletext during the recording and saves them in the nuppelvideo container. With PVR-x50 it saves only a portion of them in a completely ivtv specific format due to hardware constraints of its MPEG encoder chip, we then decode this data as we would with frame grabber caputered captions/teletext.
With ATSC we save the subtitles, but can not currently decode the subtitles. (I implemented the spec, but it a very bad spec and has little relation to actual ATSC captions.) A note on the DVB subtitles, these are almost always images not text. So there would need to be an OCR step if you wanted to be able to say search them. All other systems use text for the captions/teletext. -- Daniel
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