Mailinglist Archive: opensuse (2803 mails)

["Brian K. White" <brian@xxxxxxxxx>]

----- Original Message ----- 
From: "Rodney Baker" <rodney.baker@xxxxxxxxxxxx>
To: <opensuse@xxxxxxxxxxxx>
Sent: Saturday, July 12, 2008 12:12 PM
Subject: [opensuse] A question for the BASH gurus


> mplayer -dumpstream -dumpfile <fifo> -playlist "<url>"
> ffmpeg -i <fifo> <output_filename.mp3>.

> What I would like to know is if there is a way to redirect
> the output from mplayer directly to ffmpeg without having
> to use the named pipe and two konsole sessions. So far
> nothing I've tried has worked. I'm guessing that 
> there is likely to be more than one way to do this in a
> single step but I haven't been able to make it work yet.

Because you have to do a little too much for a single command line in a web 
browser helper app definition, you might as well just put the commands into a 
script and run "myscript <url-in> <mp3-file-out>"

streamrip:
---
#!/bin/bash
[ $# = 2 ] || { echo "usage: ${0##*/} <input playlist url> <output mp3 
filename>" ; exit 1 ; }
FIFO=/tmp/${0##*/}_${$}_fifo
mkfifo $FIFO
mplayer -dumpstream -dumpfile $FIFO -playlist "$1" &
ffmpeg -i $FIFO "$2"
rm $FIFO
---

If you can't predict the output filename because this will be a browser helper, 
then you have to generate a generic one and rename it yourself later:

"streamrip <url>" generates /shared/tunes/streamrip/<datetime>.mp3

#!/bin/bash
[ $# = 1 ] || { echo "usage: ${0##*/} <input playlist url>" ; exit 1 ; }
FIFO=/tmp/${SELF}_${$}_fifo
mkfifo $FIFO
mplayer -dumpstream -dumpfile $FIFO -playlist "$1" &
ffmpeg -i $FIFO /shared/tunes/${0##*/}/`date +%Y%m%d%H%M%S`.mp3
rm $FIFO

If mplayer -really-quiet is really quiet you could use /def/fd/1 or /dev/stdout 
or /dev/tty 
Some of those are somewhat portable to other *ix and old versions of linux, 
some only work on recent linux.

#!/bin/bash
[ $# = 1 ] || { echo "usage: ${0##*/} <input playlist url>" ; exit 1 ; }
mplayer -really-quiet -dumpstream -dumpfile /dev/fd/1 -playlist "$1" | ffmpeg 
-i - /shared/tunes/${0##*/}/`date +%Y%m%d%H%M%S`.mp3

That is, do this test:
mplayer -really-quiet -dumpstream -dumpfile /dev/null -playlist "$1" 2>/dev/null
That captures the stream to /dev/null and stderr to /dev/null, and tells 
mplayer to be quiet, and allows stdout from mplayer to go to the screen as 
usual.
If you see anything on the screen at all, any messages from mplayer, then you 
can't use a stdout|stdin pipeline simple as that. Unless there is some other 
option to mplayer to silence it. You will get junk inserted into your stream 
data.


Enhancements:

You might use Xdialog to prompt for an output mp3 filename instead of 
generating the generic one:

#!/bin/bash
[ $# = 1 ] || { echo "usage: ${0##*/} <input playlist url>" ; exit 1 ; }
OUT=`Xdialog --title "Save stream $1 as: (output mp3 file name)" --fselect ~ 28 
48 2>/dev/null`
[ -z "$OUT" -o $? != 0 ] && exit
mplayer -really-quiet -dumpstream -dumpfile /dev/fd/1 -playlist "$1" | ffmpeg 
-i - $OUT

There is also kdialog, zenity, xmessage, gtkdialog, etc... for providing the 
gui input box. Not sure if any others have a file browser though, which is 
handier for this than a plain input box.
Similarly, you could use *dialog to prompt for the input url if none was 
supplied on the command line, instead of merely printing an error message as 
I'm doing above.

You might be able to get ID3 data from the stream and massage that into a 
filename, and fallback to a generic filename if no id3 data available, but that 
would take more scripting and more detailed knowledge of mplayer or some other 
utility.

I wouldn't do any of this junk however.

http://streamripper.sourceforge.net


--
Brian K. White    brian@xxxxxxxxx    http://www.myspace.com/KEYofR
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