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avdevice/decklink_dec: add support for decoding teletext from 10bit ancillary data

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This also add supports for 4K DeckLink cards because they always output the
ancillary data in 10-bit.

v2:
- only try teletext decoding for 576i PAL mode
- some comments as requested by Aaron Levinson

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2017-07-18 18:28:57 +02:00
parent 4c1aac893c
commit cc0916bfc2
2 changed files with 48 additions and 19 deletions
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doc/indevs.texi
+2 -2
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@@ -250,8 +250,8 @@ specifically lines 6 to 22, and lines 318 to 335. Line 6 is the LSB in the mask.
Selected lines which do not contain teletext information will be ignored. You
can use the special @option{all} constant to select all possible lines, or
@option{standard} to skip lines 6, 318 and 319, which are not compatible with all
receivers. Capturing teletext only works for SD PAL sources in 8 bit mode.
To use this option, ffmpeg needs to be compiled with @code{--enable-libzvbi}.
receivers. Capturing teletext only works for SD PAL sources. To use this
option, ffmpeg needs to be compiled with @code{--enable-libzvbi}.
@item channels
Defines number of audio channels to capture. Must be @samp{2}, @samp{8} or @samp{16}.