On 17.01.2017 20:43, Paul B Mahol wrote:
Signed-off-by: Dave Rice <[email protected]>
Signed-off-by: Paul B Mahol <[email protected]>
---
doc/filters.texi | 70 ++++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_readeia608.c | 268 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 340 insertions(+)
create mode 100644 libavfilter/vf_readeia608.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 94548b1..57170e3 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -11249,6 +11249,76 @@ less than @code{0}, the filter will try to use a good
random seed on a
best effort basis.
@end table
+@section readeia608
+
+Read closed captioning (EIA-608) information from the top lines of a video
frame.
+
+This filter adds frame metadata for @code{lavfi.readeia608.cc.X} and
+@code{lavfi.readeia608.line.X}, where @code{X} is the number of the identified
line
+with EIA-608 data (starting from 0). A description of each metadata value
follows:
+
+@table @option
+@item lavfi.readeia608.cc.X
+The two bytes stored as EIA-608 data (printed in hexadecimal).
+
+@item lavfi.readeia608.line.X
+The number of the line on which the EIA-608 data was identified and read.
+@end table
From what I see this is a pair of values that belong together.
lavfi.readeia608.X.cc
lavfi.readeia608.X.line
would indicate that better, IMHO.
+
+This filter accepts the following options:
+
+@table @option
+@item start
+Set the line to start scanning for EIA-608 data. Default is @code{0}.
+
+@item end
+Set the line to end scanning for EIA-608 data. Default is @code{29}.
What about naming them "scan_min/scan_max" for alignment with "readvitc"
filter?
+
+@item mac
+Set minimal acceptable amplitude change for sync codes detection.
+Default is @code{0.2}. Allowed range is @code{[0.001 - 1]}.
+
+@item spw
+Set the ratio of width reserved for sync code detection.
+Default is @code{0.27}. Allowed range is @code{[0.01 - 0.7]}.
+
+@item mhd
+Set the max peaks height difference for sync code detection.
+Default is @code{0.1}. Allowed range is @code{[0.0 - 0.5]}.
+
+@item mpd
+Set max peaks period difference for sync code detection.
+Default is @code{0.1}. Allowed range is @code{[0.0 - 0.5]}.
+
+@item msd
+Set the first two max start code bits differences.
+Default is @code{0.02}. Allowed range is @code{[0.0 - 0.5]}.
+
+@item bhd
+Set the minimum ratio of bits height compared to 3rd start code bit.
+Default is @code{0.75}. Allowed range is @code{[0.01 - 1]}.
+
+@item wth
+Set the white color threshold. Default is @code{0.35}. Allowed range is
@code{[0.1 - 1]}.
+
+@item bth
+Set the black color threshold. Default is @code{0.15}. Allowed range is
@code{[0.0 - 0.5]}.
"thr_w/thr_b"?
+
+@item chp
+Enable checking the parity bit. In the event of a parity error, the filter
will output
+@code{0x00} for that character. Default is false.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Output a csv with presentation time and the first two lines of identified
EIA-608 captioning data.
+@example
+ffprobe -f lavfi -i movie=captioned_video.mov,readeia608 -show_entries
frame=pkt_pts_time:frame_tags=lavfi.readeia608.cc.0,lavfi.readeia608.cc.1 -of
csv
+@end example
+@end itemize
+
@section readvitc
Read vertical interval timecode (VITC) information from the top lines of a
[...]
BTW: Do you have some example file available for testing?
Regards,
Tobias
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