DVB search
While following the directions in Adding QAM Channels For HDTV Tuner Cards I ran into a few problems.
./dvbscan atsc/us-Cable-Standard-center-frequencies-QAM256
returned over 200 channels, none of them had useable names, and the names would often repeat..
Example
[0006]:657000000:QAM_256:74:75:6 [000c]:657000000:QAM_256:0:80:12 [0001]:657000000:QAM_256:76:77:1 [0005]:663000000:QAM_256:0:65:5 [0006]:663000000:QAM_256:0:77:6 [0002]:663000000:QAM_256:0:68:2 [000b]:663000000:QAM_256:74:75:11 [000c]:663000000:QAM_256:72:73:12 . . [003d]:735000000:QAM_256:237:238:61 [0002]:741000000:QAM_256:0:72:2 [0006]:741000000:QAM_256:66:67:6 [0008]:741000000:QAM_256:74:75:8 [0009]:741000000:QAM_256:64:65:9 [000c]:741000000:QAM_256:0:78:12 [000a]:741000000:QAM_256:88:89:10
.. also ..
mplayer -vo jpeg:quality=95 -frames 2 -nosund dvb://[channel name]
Would run usually 'forever' and not return anything of use...
The following is the way that I worked around these problems...
First we have to 'fix' the channels.conf to use names that do not repeat.
This can be done using the following script.
fixnames.sh:
#!/bin/sh COUNT=1 for ln in `cat channels.conf ` do CHAN=`echo "$ln" | awk -F "]" {'print $2'}` echo "$COUNT$CHAN" >>channels.conf.new COUNT=`echo "$COUNT + 1" | bc` done
channels.conf.new should look something like this..
1:555000000:QAM_256:20:21:19 2:555000000:QAM_256:26:27:20 3:567000000:QAM_256:16:17:91 4:567000000:QAM_256:20:21:89 5:567000000:QAM_256:30:31:99 6:609000000:QAM_256:0:65:7 7:609000000:QAM_256:88:89:3 8:609000000:QAM_256:97:98:4 9:609000000:QAM_256:0:68:9
copy channels.conf.new to ~/.mplayer/channels.conf (if you are the cautious type, back up your old ~/.mplayer/channels.conf)
Next we will want to search all of the channels using the following script.
scan.sh:
#!/bin/sh for ch in `cat ~/.mplayer/channels.conf |awk -F ":" {'print $1'}` do DATE=`date` NEWFILE="$ch.jpg" echo "$DATE | $ch start scan.." >> scan.log nohup mplayer -vo jpeg:quality=95 -frames 2 -ao null dvb://[$ch] & for i in 1 2 3 4 5 6 7 8 9 10 11 12 do sleep 10 if [ -r 00000001.jpg ] then break fi done RETURN=`ps aux |grep mplayer |grep -v grep |awk {'print $2'}|wc -l` if [[ $RETURN -eq "1" ]] then kill `ps aux |grep mplayer |grep -v grep |awk {'print $2'}` DATE=`date` echo "$DATE | $ch was killed! " >> scan.log else DATE=`date` echo "$DATE | $ch ended! " >> scan.log fi DATE=`date` echo "$DATE | $ch end scan.." >> scan.log if [ -r 00000001.jpg ] then echo "$DATE | We gots somthin!" >> scan.log mv 00000001.jpg "./found/$NEWFILE" else echo "$DATE | We gots nothin!" >> scan.log fi sleep 5 done
notes:
- make sure that you have a ./found/ directory to store the found images
- make sure that you are not running more than one instance of mplayer
Depending on how many channels you have this is going to take a while... Take this opportunity to spend some time with your wife... I know that mine appreciated it.
When its complete with any luck you should have a series of .jpg files in ./found/ the file name will correspond to the channel number in ~/.mplayer/channels.conf
From there you can trim down your channels.conf and follow the directions found in Adding QAM Channels For HDTV Tuner Cards
Let me know if this helps or if you have any suggestions. User_talk:Ll