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Wed Aug 31 06:56:54 2011 UTC (2 years, 7 months ago) by jruoho
Branches: MAIN
CVS tags: HEAD
Update.

# Miscellaneous DVB Notes

## How to test that a device is working?

Here is one basic way to test a [[!template id=man name="dtv" section="4"]] device. The example uses DVB-T. First install the necessary packages

	# cd /usr/pkgsrc/multimedia/dvb-apps
	# make install package clean

	# cd /usr/pkgsrc/multimedia/mplayer
	# make install package clean

Scan a basic `channels.conf`:

	$ scan -x 0 /usr/pkg/share/dvb/dvb-t/fi-Turku > ~/.mplayer/channels.conf

Then you should be able to already use `mplayer`:

	$ mplayer dvb://"YLE TV1"

Above "YLE TV1" is a channel present in the configuration file. For more
involved testing, one can use for instance `tzap` (or equivalently, `czap`
or `szap`). First prepare again the configuration file:

	$ mkdir ~/.tzap && cd ~/.tzap
	$ ln -s ~/.mplayer/channels.conf .

Then in one terminal set the driver for recording:

	$ tzap -r "YLE TV1"

This gives continuous information about the signal strength, signal to noise
ratio (SNR), bit error rate (BER), and the number of uncorrected blocks (UNC),
respectively. The values typically vary across cards and are often somewhat
unreliable. But check for the FE_HAS_LOCK flag; it indicates whether the
card has locked onto a signal. If there is a lock, pipe in an another terminal:

	$ cat /dev/dvb/adapter0/dvr0 > file.ts

At some point break the pipe. If the output file is empty, something is wrong.
Otherwise you can try to play it with `mplayer`.

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