Missing SAP

[johnnyauyeung]

I tried to stream 4 four programs of one frequency to 4 stream with SAP announcement P1, P2, P3, P4 under group G1.

Most of the time, I can see only 3 of them announced. Sometime "P1, P2, P3", sometimes "P1,P2,P4".
Here is my command line:
c:vlc -vvv dvb-t://frequency=482000000 :dvb-adapter=0 :programs=1,2,3,4 :
sout=#duplicate{dst=udp{dst=239.190.1.1:1234,sap,group=G1,name=P1},select=program=1,
dst=udp{dst=239.190.1.2:1234,sap,group=G1,name=P2},select=program=2,
dst=udp{dst=239.190.1.3:1234,sap,group=G1,name=P3},select=program=3,
dst=udp{dst=239.190.1.4:1234,sap,group=G1,name=P4},select=program=4} :ttl=3 :sout-keep

I'm using 1.1.10 windows version. Anyone see this before ? It is related to wrong syntax?
Adding ":sout-rtp-sap" or ":sout-standard-sap" have no effect for that issue.

[Rémi Denis-Courmont]

I guess you should check with wireshark that you actually do send and receive the SAP announces.

There may be some packet loss.

[johnnyauyeung]

Packet capture on both server and client machine show that ALL 4 program's SAP.
However, neither vlc player on server or client machine can see all the announcement.
Sometimes only 2 or 3 program appear. In rare case, it has all 4 programs there.
No matter the program appears or not, the stream can be play by using the URL directly.
It seems like the player's issue.

[pierre2mars]

Hi,

same issue here:

A windows XP PC streams and sends sap announces.
A Win7 PC tries to receive them
vlc 1.1.11 on both PCs.
sap announce and stream are seen and displayed on the XP host PC.
On the client, I see the stream packets and sap announces in wireshark ,but nothing in VLC, no sap, and if I open the network stream directly, no errors but no video...
logs on client:

Code: Select all

qt4 warning: Input option: rtp-caching=1000 main debug: adding item `rtp://239.255.12.42:9875' ( rtp://@239.255.12.42:9875 ) qt4 debug: Adding a new MRL to recent ones: rtp://@239.255.12.42:9875 main debug: rebuilding array of current - root Playlist main debug: rebuild done - 2 items, index 0 main debug: processing request item rtp://239.255.12.42:9875 node null skip 0 main debug: resyncing on rtp://239.255.12.42:9875 main debug: rtp://239.255.12.42:9875 is at 1 main debug: starting new item main debug: creating new input thread main debug: Creating an input for 'rtp://239.255.12.42:9875' main debug: thread started main debug: thread (input) created at priority 1 (../.././src/input/input.c:220) main debug: using timeshift granularity of 50 MiB main debug: using timeshift path 'C:\Users\PG\AppData\Local\Temp' main debug: `rtp://@239.255.12.42:9875' gives access `rtp' demux `' path `@239.255.12.42:9875' main debug: creating demux: access='rtp' demux='' path='@239.255.12.42:9875' main debug: looking for access_demux module: 1 candidate main debug: net: opening 239.255.12.42 datagram port 9875 main debug: Multicast group join request main debug: using access_demux module "rtp" main debug: TIMER module_need() : 0.000 ms - Total 0.000 ms / 1 intvls (Avg 0.000 ms) main debug: looking for meta reader module: 2 candidates lua debug: Trying Lua scripts in C:\Users\PG\AppData\Roaming\vlc\lua\meta\reader lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\reader lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\reader\filename.lua main debug: no meta reader module matching "any" could be loaded main debug: TIMER module_need() : 1.000 ms - Total 1.000 ms / 1 intvls (Avg 1.000 ms) main debug: `rtp://@239.255.12.42:9875' successfully opened qt4 debug: IM: Setting an input

any idea?

Pierre

[Rémi Denis-Courmont]

You can't open the SAP group as an RTP stream. No bugs there.

[pierre2mars]

problem was due to an other program: Connectify (software hotspot). I don't know how, but it makes VLC not see SAP announces..
Problem solved.
thanks