FIXED: Invoking VLC from a script

[xyz000]

Hello,

First I confess to being relatively new to Linux so please accept my apoligies if the answer to this question is trivial.

VLC version: 0.9.8a
System: Centos 5 on x86

I'm trying to invoke a VLC stream from a bash script. I've figured out the command I want to use and have proved that the following command (typed in at the "$" prompt) does exactly what I want:

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cvlc "source.mp3" --sout '#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}'

Next I put this into a script:

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#!/bin/bash cvlc "source.mp3" --sout '#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}'

This works too. So far so good. Then I tried this script:

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#!/bin/bash VLCCMD="cvlc \"source.mp3\" --sout '#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}'" echo VLC Command:$VLCCMD $VLCCMD

All I've tried to do here is assign the VLC command to a script variable called "$VLCCMD". To assign to the variable I've enclosed the entire command in double-quotes which means I had to escape the double-quotes around the MP3 filename. This is the output I get :

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VLC Command:cvlc "source.mp3" --sout '#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}' VLC media player 0.9.8a Grishenko [00000001] main libvlc debug: VLC media player - version 0.9.8a Grishenko - (c) 1996-2008 the VideoLAN team [00000001] main libvlc debug: libvlc was configured with ./configure '--build=i686-redhat-linux-gnu' '--host=i686-redhat-linux-gnu' '--target=i386-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/usr/com' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--disable-dependency-tracking' '--disable-rpath' '--disable-static' '--with-PIC' '--enable-release' '--enable-aa' '--enable-alsa' '--enable-arts' '--enable-caca' '--enable-cddax' '--enable-dirac' '--enable-dvbpsi' '--enable-dvdread' '--enable-esd' '--enable-faad' '--enable-fbosd' '--enable-ffmpeg' '--with-ffmpeg-tree=ffmpeg-20080225' '--with-ffmpeg-a52' '--with-ffmpeg-faac' '--with-ffmpeg-mp3lame' '--enable-libamr-nb' '--enable-libamr-wb' '--with-ffmpeg-ogg' '--with-ffmpeg-theora' '--with-ffmpeg-vorbis' '--with--ffmpeg-zlib' '--enable-flac' '--enable-galaktos' '--enable-gnomevfs' '--enable-lirc' '--enable-live555' '--with-live555-tree=/dar/build/vlc-0.9.8a/live' '--enable-loader' '--enable-musicbrainz' '--enable-ncurses' '--enable-opencv' '--enable-pulse' '--enable-pvr' '--enable-real' '--enable-realrtsp' '--enable-shout' '--enable-snapshot' '--enable-svg' '--enable-svgalib' '--enable-switcher' '--enable-twolame' '--enable-upnp' '--enable-v4l' '--enable-xosd' '--enable-xvmc' 'build_alias=i686-redhat-linux-gnu' 'host_alias=i686-redhat-linux-gnu' 'target_alias=i386-redhat-linux-gnu' 'CFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables' 'LDFLAGS=-L/usr/X11R6/lib' 'CXXFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables' 'PKG_CONFIG_PATH=/usr/lib/pkgconfig:/usr/share/pkgconfig' [00000001] main libvlc debug: translation test: code is "C" [00000413] inhibit interface error: Failed to connect to the D-Bus session daemon: Failed to execute dbus-launch to autolaunch D-Bus session [00000413] main interface error: no suitable interface module [00000001] main libvlc error: interface "inhibit,none" initialization failed [00000419] dummy interface: using the dummy interface module... [00000430] stream_out_standard stream out error: no access _and_ no muxer (fatal error) [00000429] main stream output error: stream chain failed for `standard{mux="",access="",dst="'#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}'"}' [00000428] main input error: cannot start stream output instance, aborting

To tidy this up a little...the only differences between the console output when I use a script variable and when I do not use a script variable is as follows:

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VLC Command:cvlc "source.mp3" --sout '#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}' (...identical output removed here...) [00000430] stream_out_standard stream out error: no access _and_ no muxer (fatal error) [00000429] main stream output error: stream chain failed for `standard{mux="",access="",dst="'#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}'"}' [00000428] main input error: cannot start stream output instance, aborting

Any ideas what I'm doing wrong?

Thanks!

[Jean-Baptiste Kempf]

Try remove the quotes around source.mp3 in your script.

[xyz000]

Hi j-b ... thanks for such a quick response.

Try remove the quotes around source.mp3 in your script.

I'm sorry to say I get exectly the same sypmtom (and I first proved that removing the quotes in the script version that doesn't use $VLCCMD correctly plays the file).

Any other ideas? I've tried adding the -vvv option for ultra-verbose output but I didn't spot anything obvious.

[xyz000]

OK I've fixed it. Experimentation showed me that the answer is:

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#!/bin/bash VLCCMD="cvlc source.mp3 --sout "#duplicate{dst=std{access=udp,dst=192.168.0.2:1235}}"" echo VLC Command:$VLCCMD $VLCCMD

There are two changes to my original script:

• remove the double quotes from the MP3 filename

• change the single-quote around the #duplicate to a double-quote

If anybody can explain why this works then I'd be grateful...I thought the script interpreter would see the double-quote immediately before the #duplicate as the terminating quote for the VLCCMD variable assignment. Still, it works so I'm happy.