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I use this API calls:

m_pMedia = libvlc_media_new (m_pLibVlc, pName, &m_vlcExc);
m_pMediaPlayer = libvlc_media_player_new_from_media (m_pMedia, &m_vlcExc);
libvlc_media_release (m_pMedia);
libvlc_media_player_play (m_pMediaPlayer, &m_vlcExc);

It works fine when my input is a file (pName). But it doesn't work when it is a stream like this
rtp://@224.0.0.21:1234

The error message is:
main access error: no access module matched "rtp"
main input error: open of `rtp://@224.0.0.21:1234' failed: no access module matched "rtp"
main input error: Your input can't be opened

What I have to change for this?

Thanks in advance
lexalow

please, MORE messages.

Ok, here more code about my test:

libvlc_exception_t m_vlcExc;
libvlc_instance_t * m_pLibVlc;
libvlc_media_player_t * m_pMediaPlayer;
libvlc_media_t * m_pMedia;

/* FUNCTION ******************************************************************/
bool VlcLib::Check4Exc (libvlc_exception_t *pExc)
{
if (libvlc_exception_raised (pExc))
{
strncpy (m_szError, libvlc_exception_get_message(pExc), sizeof (m_szError) - 1);
DIAG1(TM_ERROR,"VlcLib::Check4Exc exception raised %s", m_szError);
fprintf (stderr, "Check4Exc error: %s\n", m_szError);
return false;
}
libvlc_exception_clear (pExc);
*m_szError = 0;
return true;
}

/* FUNCTION ******************************************************************/
bool VlcLib::VLCInit (void)
{
libvlc_exception_init (&m_vlcExc);
m_pLibVlc = libvlc_new (0, 0, &m_vlcExc);
if (!m_pLibVlc || !Check4Exc (&m_vlcExc))
{
DIAG(TM_ERROR,"VlcLib::VLCInit libvlc_new failed");
m_iError = ERROR_LIBVLC_NEW;
return false;
}
return true;
}

/* FUNCTION ******************************************************************/
bool VlcLib::CreateMediaPlayer (const char *psz_MRL)
{

DIAG1(TM_INFO,"VlcLib::CreateMediaPlayer with %s +++", psz_MRL);
m_pMedia = libvlc_media_new (m_pLibVlc, psz_MRL, &m_vlcExc);
if (!Check4Exc (&m_vlcExc))
{
DIAG(TM_ERROR,"VlcLib::CreateMediaPlayer failed");
m_iError = ERROR_LIBVLC_CREATEMEDIA;
return false;
}
m_pMediaPlayer = libvlc_media_player_new_from_media (m_pMedia, &m_vlcExc);
if (!Check4Exc (&m_vlcExc))
{
DIAG(TM_ERROR,"VlcLib::CreateMediaPlayer failed");
m_iError = ERROR_LIBVLC_CREATEMEDIA;
return false;
}
libvlc_media_release (m_pMedia);
DIAG(TM_INFO,"VlcLib::CreateMediaPlayer ---");
return true;
}

/* FUNCTION ******************************************************************/
bool VlcLib::PlayMediaPlayer (void)
{
DIAG(TM_INFO,"VlcLib::PlayMediaPlayer +++");
libvlc_media_player_play (m_pMediaPlayer, &m_vlcExc);
if (!Check4Exc (&m_vlcExc))
{
DIAG(TM_ERROR,"VlcLib::Play libvlc_playlist_play failed");
m_iError = ERROR_LIBVLC_PLAY;
return false;
}
DIAG(TM_INFO,"VlcLib::PlayMediaPlayer ---");
return true;

}

The call sequence is:
VLCInit ():
CreateMediaPlayer ("rtp://@224.0.0.21:1234");
PlayMediaPlayer (void);

My system is debian lenny 64bit. The input stream is an ATSC RTP-MPEG2-TS. When I use the vlc-gui it works. I'll try to debug. But hints are welcome

Here more messages.
Start with command line and it plays:

$ ./vlc -v rtp://@224.0.0.21:1234
VLC media player 1.0.0-pre1 Goldeneye
[0x13ba1e8] main libvlc warning: cannot load module `/home/usr/vlc//lib/vlc/demux/liblive555_plugin.so' (/home/usr/vlc//lib/vlc/demux/liblive555_plugin.so: undefined symbol: _ZTI9HashTable)
[0x13ba1e8] main libvlc warning: cannot load module `/home/axel/vlc/build/modules/demux/.libs/liblive555_plugin.so' (/home/axel/vlc/build/modules/demux/.libs/liblive555_plugin.so: undefined symbol: _ZTI9HashTable)
[0x13ba1e8] main libvlc warning: cannot load module `/home/axel/vlc/build/modules/access/.libs/libdvdnav_plugin.so' (/home/axel/vlc/extras/contrib/lib/libdvdread.so.4: undefined symbol: dvdcss_interface_2)
[0x16a4998] main demux warning: cannot load module `/home/usr/vlc//lib/vlc/access/libdvdnav_plugin.so' (/home/axel/vlc/extras/contrib/lib/libdvdread.so.4: undefined symbol: dvdcss_interface_2)
[0x16a4998] main demux warning: no access_demux module matching "file" could be loaded
[0x13ba1e8] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
libdvbpsi error (PSI decoder): TS discontinuity (received 4, expected 0) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 9, expected 0) for PID 80
libdvbpsi error (PSI decoder): TS discontinuity (received 8, expected 0) for PID 64
[0x16abe98] ts demux warning: first packet for pid=81 cc=0x6
libdvbpsi error (PSI decoder): TS discontinuity (received 9, expected 0) for PID 48
[0x16abe98] ts demux warning: first packet for pid=49 cc=0x6
[0x16abe98] ts demux warning: first packet for pid=65 cc=0xa

Start with my test with libvlc, it doesn't work:

1166:106235 vlclib 0 VlcLib::VLCInit +++
1166:106240 vlclib 0 VlcLib::VLCInit command arg1 -v
1166:106243 vlclib 0 VlcLib::VLCInit command arg2 rtp://@224.0.0.21:1234
[0x25bb5a8] main libvlc warning: cannot load module `/home/usr/vlc//lib/vlc/demux/liblive555_plugin.so' (/home/usr/vlc//lib/vlc/demux/liblive555_plugin.so: undefined symbol: _ZTI9HashTable)
[0x2784418] main demux warning: no access_demux module matching "file" could be loaded
1166:161774 recode 0 ERROR Recode::Run VLCInit
1166:161788 vlclib 0 VlcLib::CreateMediaPlayer with rtp://@224.0.0.21:1234 +++
1166:161828 vlclib 0 VlcLib::CreateMediaPlayer ---
1166:161834 vlclib 0 VlcLib::PlayMediaPlayer +++
1166:168526 vlclib 0 VlcLib::PlayMediaPlayer ---
1166:168537 recode 0 Run ---
[0x278d288] main demux warning: cannot load module `/home/usr/vlc//lib/vlc/access/librtp_plugin.so' (/home/usr/vlc//lib/vlc/access/librtp_plugin.so: undefined symbol: gcry_cipher_setkey)
[0x278d288] main demux warning: no access_demux module matching "rtp" could be loaded
[0x278d538] main access error: no access module matched "rtp"
[0x27849b8] main input error: open of `rtp://@224.0.0.21:1234' failed: no access module matched "rtp"
[0x27849b8] main input error: Your input can't be opened
[0x27849b8] main input error: VLC is unable to open the MRL 'rtp://@224.0.0.21:1234'. Check the log for details.

It seams, that in this way the librtp_plugin is needed and in the commad line case not. I had build the extras/contrib libraries without gcrypt, becourse compile problems with old debian libraries.
Is there a way to play with libvlc api without grypt module (like command line above)?

Your RTP plugin was not linked properly.

thanks for your hint. I had trouble with the libgcrypt version. Debian lenny gets the 1.4.2 vlc 1.0.0-pre1 wants 1.4.3 and the download link for that did not exist. Now I built the pre2 (with libgcrypt 1.4.4) and it works. I transcode a ATSC HD (1080i) RTP-MPEG2 ip stream to H.264 AAC RTP MPEG2-TS stream. It works super. As the last one question to the output module: Is it already possible to configure the output for a rtp stream without a MPEG2-TS container, only with the pes nals?

If you don't specify mutx=ts, then VLC will stream AVC or whatever elementary stream as directly over RTP