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.c 2010-11-27 10:56:57.000000000 -0800
+++ gnutv-new.c 2010-11-27 11:34:41.000000000 -0800
@@ -54,7 +54,8 @@
" -frontend <id> frontend to use (default 0)\n"
" -demux <id> demux to use (default 0)\n"
" -caslotnum <id> ca slot number to use (default 0)\n"
- " -channels <filename> channels.conf file.\n"
+ " -channel_list <filename> channels.conf file.\n"
+ " -channel_name <name> Name of the channel to tune to.\n"
" -secfile <filename> Optional sec.conf file.\n"
" -secid <secid> ID 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 <secs> Number of seconds to output channel for\n"
" (0=>exit immediately after successful tuning,
default is to output forever)\n"
" -cammenu Show the CAM menu\n"
- " -nomoveca Do not attempt to move CA descriptors from
stream to programme level\n"
- " <channel name>\n";
+ " -nomoveca Do 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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