HoP wrote:
2010/4/17 David Liontooth <lionteeth@xxxxxxxxxx>:
HoP wrote:
2010/4/17 Devin Heitmueller <dheitmueller@xxxxxxxxxxxxxx>:
On Fri, Apr 16, 2010 at 7:19 PM, David Liontooth <lionteeth@xxxxxxxxxx>
wrote:
I'm using a HVR-1850 in digital mode and get good picture and sound
using
mplayer -autosync 30 -cache 2048 dvb://KCAL-DT
Closed captioning works flawlessly with this command:
zvbi-atsc-cc -C test-cc.txt KCAL-DT
However, if I try to run both at the same time, I get a device node
conflict:
zvbi-atsc-cc: Cannot open '/dev/dvb/adapter0/frontend0': Device or
resource
busy.
How do I get video and closed captioning at the same time?
To my knowledge, you cannot run two userland apps streaming from the
frontend at the same time. Generally, when people need to do this
sort of thing they write a userland daemon that multiplexes.
Alternatively, you can cat the frontend to disk and then have both
mplayer and your cc parser reading the resulting file.
Usually there is some way, for ex. command line option,
how to say to "second" app that frondend is already locked.
Then second app simply skips tuning at all.
Rest processing is made using demux and dvr devices,
so there is not reason why 2 apps should tune in same
time.
/Honza
Thanks! I'm trying to create separate recordings of the video/audio file on
the one hand and the closed captioning on the other.
In one console, I issue
azap -r KOCE-HD
In a second, I issue
cat /dev/dvb/adapter0/dvr0 > test-cat3.mpeg
I cannot at the same time run this in a third:
zvbi-atsc-cc -C test-cc.txt KOCE-HD
because of resource conflict.
Using cat works, but how do I get closed captioning from the resulting mpeg
file?
Very dump way is simply feed zvbi with resulting test-cat3.mpeg.
If this page is correct: http://www.digipedia.pl/man/doc/view/zvbi-atsc-cc.1/
using -t command line option you can get CC by issuing something like
"cat test-cat3.mpeg > zvbi-atsc-cc -ts -C test-cc.txt"
Of course I'm assuming that CC pid is included in recording.
But dunno if azap is demuxing pids others then A/V.
/Honza
That's promising but no cigar:
cat test-cat3.mpeg > zvbi-atsc-cc --ts
just feeds the output of the cat into a file called zvbi-atsc-cc (not
surprisingly).
cat test-cat3.mpeg | zvbi-atsc-cc --ts
also doesn't work. zvbi-atsc-cc's --ts switch is designed to "Decode a
DVB Transport Stream on stdin", so if the file created with
cat /dev/dvb/adapter0/dvr0 > test-cat3.mpeg
qualifies as a DVB Transport Stream, then there's a way to pipe it to
zvbi-atsc-cc. How do we get the syntax for this?
I'm also wondering if zvbid, the zvbi daemon, could be used to get a
text file output from zvbi-atsc-cc. This would seem the more elegant
solution.
Cheers,
Dave
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