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I'm trying to play on VLC a RTP input stream coming from the port 9954, UDP socket. So, I launch VLC on the console with this command: vlc -vvv rtp://:@9954. VLC appears, but no media is played. The command prompt also shows this lines:

**jarabo@jt:~$ vlc -vvv rtp://:@9954
VLC media player 2.0.3 Twoflower (revision 2.0.2-93-g77aa89e)
[0x203b108] main libvlc debug: VLC media player - 2.0.3 Twoflower
[0x203b108] main libvlc debug: Copyright © 1996-2012 VLC authors and VideoLAN
[0x203b108] main libvlc debug: revision 2.0.2-93-g77aa89e
[0x203b108] main libvlc debug: configured with ./configure  '--enable-static' '--build=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security' 'CPPFLAGS=-D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro' '--config-cache' '--disable-maintainer-mode' '--disable-silent-rules' '--disable-update-check' '--enable-fast-install' '--prefix=/usr' '--docdir=/usr/share/doc/vlc-nox' '--sysconfdir=/etc' '--with-binary-version=0ubuntu0.12.04.1' '--enable-a52' '--enable-aa' '--enable-bluray' '--enable-bonjour' '--enable-caca' '--enable-dbus' '--enable-dca' '--enable-dirac' '--enable-directfb' '--enable-dvbpsi' '--enable-dvdnav' '--enable-faad' '--enable-flac' '--enable-fluidsynth' '--enable-freetype' '--enable-fribidi' '--enable-gnutls' '--enable-jack' '--enable-kate' '--enable-libass' '--enable-libmpeg2' '--enable-libproxy' '--enable-libxml2' '--enable-lirc' '--enable-live555' '--enable-mad' '--enable-mkv' '--enable-mod' '--enable-mpc' '--enable-mtp' '--enable-mux_ogg' '--enable-ncurses' '--enable-notify' '--enable-ogg' '--enable-oss' '--enable-pulse' '--enable-qt4' '--enable-realrtsp' '--enable-samplerate' '--enable-schroedinger' '--enable-sdl' '--enable-shout' '--enable-skins2' '--enable-smb' '--enable-speex' '--enable-svg' '--enable-taglib' '--enable-theora' '--enable-twolame' '--enable-upnp' '--enable-vcd' '--enable-vcdx' '--enable-vorbis' '--enable-x264' '--enable-zvbi' '--with-kde-solid=/usr/share/kde4/apps/solid/actions/' '--disable-dxva2' '--disable-gnomevfs' '--disable-goom' '--disable-portaudio' '--disable-projectm' '--disable-sqlite' '--disable-telx' '--enable-alsa' '--enable-atmo' '--enable-dc1394' '--enable-dv' '--enable-fbosd' '--enable-libva' '--enable-linsys' '--enable-omxil' '--enable-pvr' '--enable-udev' '--enable-v4l2' '--enable-crystalhd' '--enable-mmx' '--enable-sse' '--disable-neon' '--disable-altivec' 'build_alias=x86_64-linux-gnu'
[0x203b108] main libvlc debug: searching plug-in modules
[0x203b108] main libvlc debug: loading plugins cache file /usr/lib/vlc/plugins/plugins.dat
[0x203b108] main libvlc debug: recursively browsing `/usr/lib/vlc/plugins'
[0x203b108] main libvlc debug: saving plugins cache /usr/lib/vlc/plugins/plugins.dat
[0x203b108] main libvlc debug: plug-ins loaded: 420 modules
[0x203b108] main libvlc debug: opening config file (/home/jarabo/.config/vlc/vlcrc)
[0x203b108] main libvlc debug: translation test: code is "es"
[0x203b108] main libvlc debug: CPU has capabilities MMX MMXEXT SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 FPU 
[0x203b108] main libvlc debug: looking for memcpy module: 4 candidates
[0x203b108] main libvlc debug: using memcpy module "memcpymmxext"
[0x2051658] main input debug: Creating an input for 'Biblioteca multimedia'
[0x2051658] main input debug: Input is a meta file: disabling unneeded options
[0x2051658] main input debug: using timeshift granularity of 50 MiB, in path '/tmp'
[0x2051658] main input debug: `file/xspf-open:///home/jarabo/.local/share/vlc/ml.xspf' gives access `file' demux `xspf-open' path `/home/jarabo/.local/share/vlc/ml.xspf'
[0x2051658] main input debug: creating demux: access='file' demux='xspf-open' location='/home/jarabo/.local/share/vlc/ml.xspf' file='/home/jarabo/.local/share/vlc/ml.xspf'
[0x2102be8] main demux debug: looking for access_demux module: 3 candidates
[0x2102be8] main demux debug: no access_demux module matching "file" could be loaded
[0x2102be8] main demux debug: TIMER module_need() : 1.162 ms - Total 1.162 ms / 1 intvls (Avg 1.162 ms)
[0x2051658] main input debug: creating access 'file' location='/home/jarabo/.local/share/vlc/ml.xspf', path='/home/jarabo/.local/share/vlc/ml.xspf'
[0x2106808] main access debug: looking for access module: 2 candidates
[0x2106808] filesystem access debug: opening file `/home/jarabo/.local/share/vlc/ml.xspf'
[0x2106808] main access debug: using access module "filesystem"
[0x2106808] main access debug: TIMER module_need() : 0.539 ms - Total 0.539 ms / 1 intvls (Avg 0.539 ms)
[0x2106958] main stream debug: Using stream method for AStream*
[0x2106958] main stream debug: starting pre-buffering
[0x2106958] main stream debug: received first data after 0 ms
[0x2106958] main stream debug: pre-buffering done 304 bytes in 0s - 6184 KiB/s
[0x2106bb8] main stream debug: looking for stream_filter module: 7 candidates
[0x2106bb8] main stream debug: no stream_filter module matching "any" could be loaded
[0x2106bb8] main stream debug: TIMER module_need() : 1.360 ms - Total 1.360 ms / 1 intvls (Avg 1.360 ms)
[0x2106bb8] main stream debug: looking for stream_filter module: 1 candidate
[0x2106bb8] main stream debug: using stream_filter module "stream_filter_record"
[0x2106bb8] main stream debug: TIMER module_need() : 0.278 ms - Total 0.278 ms / 1 intvls (Avg 0.278 ms)
[0x2051658] main input debug: creating demux: access='file' demux='xspf-open' location='/home/jarabo/.local/share/vlc/ml.xspf' file='/home/jarabo/.local/share/vlc/ml.xspf'
[0x2109fe8] main demux debug: looking for demux module: 1 candidate
[0x2109fe8] playlist demux debug: using XSPF playlist reader
[0x2109fe8] main demux debug: using demux module "playlist"
[0x2109fe8] main demux debug: TIMER module_need() : 0.399 ms - Total 0.399 ms / 1 intvls (Avg 0.399 ms)
[0x210a8d8] main demux meta debug: looking for meta reader module: 2 candidates
[0x210a8d8] lua demux meta debug: Trying Lua scripts in /home/jarabo/.local/share/vlc/lua/meta/reader
[0x210a8d8] lua demux meta debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/reader
[0x210a8d8] lua demux meta debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/reader/filename.luac
[0x210a8d8] lua demux meta debug: Trying Lua scripts in /usr/share/vlc/lua/meta/reader
[0x210a8d8] main demux meta debug: no meta reader module matching "any" could be loaded
[0x210a8d8] main demux meta debug: TIMER module_need() : 1.524 ms - Total 1.524 ms / 1 intvls (Avg 1.524 ms)
[0x2051658] main input debug: `file/xspf-open:///home/jarabo/.local/share/vlc/ml.xspf' successfully opened
[0x21190c8] main xml reader debug: looking for xml reader module: 1 candidate
[0x21190c8] main xml reader debug: using xml reader module "xml"
[0x21190c8] main xml reader debug: TIMER module_need() : 0.500 ms - Total 0.500 ms / 1 intvls (Avg 0.500 ms)
[0x2109fe8] playlist demux debug: parsed 0 tracks successfully
[0x2051658] main input debug: EOF reached
[0x2109fe8] main demux debug: removing module "playlist"
[0x2106bb8] main stream debug: removing module "stream_filter_record"
[0x2106808] main access debug: removing module "filesystem"
[0x2051658] main input debug: TIMER input launching for 'Biblioteca multimedia' : 5.983 ms - Total 5.983 ms / 1 intvls (Avg 5.983 ms)
[0x2102608] main interface debug: looking for interface module: 1 candidate
[0x2102608] main interface debug: using interface module "hotkeys"
[0x2102608] main interface debug: TIMER module_need() : 0.263 ms - Total 0.263 ms / 1 intvls (Avg 0.263 ms)
[0x20521a8] main interface debug: looking for interface module: 1 candidate
[0x226c128] main playlist debug: playlist threads correctly activated
[0x20521a8] main interface debug: using interface module "inhibit"
[0x226c128] main playlist debug: rebuilding array of current - root Lista de reproducción
[0x226c128] main playlist debug: rebuild done - 0 items, index -1
[0x20521a8] main interface debug: TIMER module_need() : 4.557 ms - Total 4.557 ms / 1 intvls (Avg 4.557 ms)
[0x226c128] main playlist debug: adding item `rtp://9954' ( rtp://:@9954 )
[0x226c128] main playlist debug: meta ok for (null), need to fetch art
[0x2118ec8] main interface debug: looking for interface module: 1 candidate
[0x7f4254000b78] main demux meta debug: looking for meta fetcher module: 1 candidate
[0x7f4254000b78] lua demux meta debug: Trying Lua scripts in /home/jarabo/.local/share/vlc/lua/meta/fetcher
[0x2118ec8] main interface debug: using interface module "globalhotkeys"
[0x2118ec8] main interface debug: TIMER module_need() : 1.796 ms - Total 1.796 ms / 1 intvls (Avg 1.796 ms)
[0x203b108] main libvlc: Ejecutar vlc con la interfaz predeterminada. Use «cvlc» para usar vlc sin interfaz.
[0x7f4254000b78] lua demux meta debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/fetcher
[0x206aee8] main interface debug: looking for interface module: 6 candidates
[0x7f4254000b78] lua demux meta debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/fetcher/tvrage.luac
[0x7f4254000b78] main demux meta debug: using meta fetcher module "lua"
[0x7f4254000b78] main demux meta debug: TIMER module_need() : 2.103 ms - Total 2.103 ms / 1 intvls (Avg 2.103 ms)
[0x7f4254000b78] main demux meta debug: removing module "lua"
[0x226c128] main playlist debug: searching art for rtp://9954
[0x7f4254005918] main art finder debug: looking for art finder module: 2 candidates
[0x7f4254005918] lua art finder debug: Trying Lua scripts in /home/jarabo/.local/share/vlc/lua/meta/art
[0x7f4254005918] lua art finder debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/art
[0x7f4254005918] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/00_musicbrainz.luac
[0x7f4254005918] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/01_googleimage.luac
[0x7f4254005918] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/02_frenchtv.luac
[0x7f4254005918] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/03_lastfm.luac
[0x7f4254005918] lua art finder debug: Trying Lua scripts in /usr/share/vlc/lua/meta/art
[0x7f4254005918] main art finder debug: no art finder module matching "any" could be loaded
[0x7f4254005918] main art finder debug: TIMER module_need() : 1.675 ms - Total 1.675 ms / 1 intvls (Avg 1.675 ms)
[0x226c128] main playlist debug: art not found for rtp://9954
[0x7f42582d0428] main generic debug: looking for extension module: 1 candidate
[0x7f42582d0428] lua generic debug: Opening Lua Extension module
[0x7f42582d0428] lua generic debug: Trying Lua scripts in /home/jarabo/.local/share/vlc/lua/extensions
[0x7f42582d0428] lua generic debug: Trying Lua scripts in /usr/lib/vlc/lua/extensions
[0x7f42582d0428] lua generic debug: Trying Lua scripts in /usr/share/vlc/lua/extensions
[0x7f42582d0428] main generic debug: using extension module "lua"
[0x7f42582d0428] main generic debug: TIMER module_need() : 0.334 ms - Total 0.334 ms / 1 intvls (Avg 0.334 ms)
[0x7f42584b1448] main probe debug: looking for services probe module: 10 candidates
[0x7f42584b1448] main probe debug: no services probe module matching "any" could be loaded
[0x7f42584b1448] main probe debug: TIMER module_need() : 5.285 ms - Total 5.285 ms / 1 intvls (Avg 5.285 ms)
[0x206aee8] qt4 interface debug: Normal PL/ML or SD
[0x206aee8] qt4 interface debug: Normal PL/ML or SD
[0x206aee8] main interface debug: using interface module "qt4"
[0x206aee8] main interface debug: TIMER module_need() : 220.515 ms - Total 220.515 ms / 1 intvls (Avg 220.515 ms)
[0x226c128] main playlist debug: rebuilding array of current - root Lista de reproducción
[0x226c128] main playlist debug: rebuild done - 1 items, index -1
[0x226c128] main playlist debug: processing request item: null, node: Lista de reproducción, skip: 0
[0x226c128] main playlist debug: starting playback of the new playlist item
[0x226c128] main playlist debug: resyncing on rtp://9954
[0x226c128] main playlist debug: rtp://9954 is at 0
[0x226c128] main playlist debug: creating new input thread
[0x7f425c000b78] main input debug: Creating an input for 'rtp://9954'
[0x7f425c000b78] main input debug: using timeshift granularity of 50 MiB, in path '/tmp'
[0x7f425c000b78] main input debug: `rtp://:@9954' gives access `rtp' demux `' path `:@9954'
[0x7f425c000b78] main input debug: creating demux: access='rtp' demux='' location=':@9954' file='(null)'
[0x7f42340010c8] main demux debug: looking for access_demux module: 1 candidate
[0x7f42340010c8] main demux debug: net: opening 9954 datagram port 5004
[0x7f42340010c8] main demux debug: using access_demux module "rtp"
[0x7f42340010c8] main demux debug: TIMER module_need() : 3.135 ms - Total 3.135 ms / 1 intvls (Avg 3.135 ms)
[0x7f4234003f18] main demux meta debug: looking for meta reader module: 2 candidates
[0x7f4234003f18] lua demux meta debug: Trying Lua scripts in /home/jarabo/.local/share/vlc/lua/meta/reader
[0x7f4234003f18] lua demux meta debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/reader
[0x7f4234003f18] lua demux meta debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/reader/filename.luac
[0x7f4234003f18] lua demux meta debug: Trying Lua scripts in /usr/share/vlc/lua/meta/reader
[0x7f4234003f18] main demux meta debug: no meta reader module matching "any" could be loaded
[0x7f4234003f18] main demux meta debug: TIMER module_need() : 0.852 ms - Total 0.852 ms / 1 intvls (Avg 0.852 ms)
[0x7f425c000b78] main input debug: `rtp://:@9954' successfully opened
[0x206aee8] qt4 interface debug: IM: Setting an input**

Does anyone know which is the problem? Thanks

PD: I'm also getting this error: SDP required: A description in SDP format is required to receive the RTP stream. Note that rtp:// URIs cannot work with dynamic RTP payload format (15).

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migrated from stackoverflow.com Oct 11 '12 at 10:34

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