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?
If I can get that to work, that would be great -- but not particularly
elegant. Does someone have an example of a multiplexing userland daemon
that allows me to spit out video to one file and text to another?
Cheers,
Dave
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