I need to capture ATSC QAM closed captioning to file, and at the same
time the mpeg-ts stream to a different file. I've been looking for an
app that will let me do this.
A simple cat works:
cat /dev/dvb/adapter0/dvr0 | tee $FIL.mpg | zvbi-atsc-cc --atsc -m -C
$FIL.txt -T KCBS
But there is naturally no tuner or timer in cat, so closing the
processes at the end of the recording is a hassle; there may be other
issues cat doesn't handle optimally. I looked around and found gnutv in
the dvb-apps project.
gnutv is actively maintained, tunes ATSC QAM-256, handles individual
channels well, and has a timer -- but it has a small, show-stopper problem.
gnutv mandates that the channel name be placed at the end of the user
input. There is a great -out stdout option, but you can't use it to
pipe, since the channel name has to be placed afterwards.
I suggest we move the channel name into a flag, like the other user
values, so that we can pipe the output like this:
gnutv -adapter 0 -channel_list ~/.azap/channels.conf -timeout 10
-channel_name KCBS \
-out stdout | tee $FIL.mpg | zvbi-atsc-cc --atsc -T -9 $FIL.txt -n KCBS
With a simple patch against the today's mercurial tree, as below, this
works great. For clarity, I renamed channels to channels_list; I'll be
happy to remove that change if it breaks too many scripts. I don't know
how to make the change to channel_name so that it's backwardly
compatible, but maybe we don't need to.
Cheers,
Dave
--- gnutv.c2010-11-27 10:56:57.0 -0800
+++ gnutv-new.c2010-11-27 11:34:41.0 -0800
@@ -54,7 +54,8 @@
-frontend idfrontend to use (default 0)\n
-demux iddemux to use (default 0)\n
-caslotnum idca slot number to use (default 0)\n
- -channels filenamechannels.conf file.\n
+ -channel_list filenamechannels.conf file.\n
+ -channel_name name Name of the channel to tune to.\n
-secfile filenameOptional sec.conf file.\n
-secid secidID of the SEC configuration to use, one of:\n
* UNIVERSAL (default) - Europe, 10800 to 11800
MHz and 11600 to 12700 Mhz,\n
@@ -82,8 +83,7 @@
-timeout secsNumber of seconds to output channel for\n
(0=exit immediately after successful tuning,
default is to output forever)\n
-cammenuShow the CAM menu\n
- -nomovecaDo not attempt to move CA descriptors from
stream to programme level\n
- channel name\n;
+ -nomovecaDo not attempt to move CA descriptors from
stream to programme level\n;
fprintf(stderr, %s\n, _usage);
exit(1);
@@ -154,11 +154,16 @@
if (sscanf(argv[argpos+1], %i, caslot_num) != 1)
usage();
argpos+=2;
-} else if (!strcmp(argv[argpos], -channels)) {
+} else if (!strcmp(argv[argpos], -channel_list)) {
if ((argc - argpos) 2)
usage();
chanfile = argv[argpos+1];
argpos+=2;
+} else if (!strcmp(argv[argpos], -channel_name)) {
+if ((argc - argpos) 2)
+usage();
+channel_name = argv[argpos+1];
+argpos+=2;
} else if (!strcmp(argv[argpos], -secfile)) {
if ((argc - argpos) 2)
usage();
@@ -235,11 +240,6 @@
} else if (!strcmp(argv[argpos], -cammenu)) {
cammenu = 1;
argpos++;
-} else {
-if ((argc - argpos) != 1)
-usage();
-channel_name = argv[argpos];
-argpos++;
}
}
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