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Using a radio capture card to record

posted Jan 4, 2010, 7:34 PM by Tom Gutwin   [ updated Jan 5, 2010, 4:44 PM ]
My HVR-1600 has a built in Radio tuner that I am using to record radio shows like Randy Bachman's Vinyl Tap on CBC radio.
I have a long commute to work so I listen to a lot of shows and music.
I use Vorbis Ogg for all my tunes and my iRiver player likes Oggs too.
So...  I grab thew show and ogg it using the following tools:

My audio line out from the HVR-1600 go directly into my Line-In on my soundcard so when I record I have to capture from the LineIn.
You can see in the following command how I specify the input to ecasound is "alsahw,Line,0".
If you need to see what sound devices are available (with their settings)... try:

You can also use it to set levels and settings from the commandline, for example to unmute the lineIn AND set it as the capure source:
    amixer set Line,0 100%,100% unmute capture 2>&1>/dev/null
or to mute
    amixer set Line,0 100%,100% mute capture 2>&1>/dev/null

The command I use to tune the channel is
    /usr/bin/fm -d /dev/radio1 -T 60 88.3 90 &
The -T 60 is the time in seconds that it tunes  & holds the channel for.

The commandline I use to record is:
    /usr/bin/ecasound -b 512 -i alsahw,Line,0 -t 60 -o:stdout | /usr/bin/oggenc -Q -q 6 --raw --raw-bits=16 --raw-chan=2 --raw-rate=44100 --raw-endianness 0 -t "TestCBC-Mon Jan 04 2010 (19:41)" -c "TITLE=TestCBC on Mon Jan 04 2010 (19:41)" -d "Mon Jan 04 2010 (19:41)" -c "CITY=North Vancouver" -c "FREQUENCY=88.3MHz"  -o "/home/tgutwin/Music/radio/TestCBC_2010-01-04-Mon.ogg"  -

Again, notice the -t 60 that specifies the duration of the recording in seconds
don't forget that last '-'  to read from stdIn

You also could drop all the vorbis comments so the line looks more like:
    /usr/bin/ecasound -b 512 -i alsahw,Line,0 -t 60 -o:stdout | /usr/bin/oggenc -Q -q 6 --raw --raw-bits=16 --raw-chan=2 --raw-rate=44100 --raw-endianness 0  -o "/home/tgutwin/Music/radio/TestCBC_2010-01-04-Mon.ogg"  -

Try it out.

You have already probably jumped to the thought of putting this all into a script.
For that see attached
Tom Gutwin,
Jan 5, 2010, 4:51 PM