Problem with "waiting for SPS/PPS"

[QuakeCH]

Hello,

I'm using a nightly version of VLC (vlc-0.9.0 , 20080120) and have a problem with the relay server.

The main server isn't making problems , I can get the video + audio correctly. But If I'm trying to connect onto the Relay server I become always : "waiting for SPS/PPS" on my VLC client and sometimes I become the video + audio (and then it's ok).

I think that's a bug , that seem that the Header isn't sent everytime. I tried to tune h264.c (vlc/modules/packetsizer) without success.

Command line on Relay server :

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vlc -vvvvv http://server_1:6424 --sout='#std{access=http,mux=ts,dst=:8080}'

Command line on Main Server :

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vlc ..... --sout='#transcode{vcodec=xvid,acodec=mpga,vb=300,width=320,height=288,ab=64,venc=x264}:standard{access=http,mux=ps,dst=:6424}'

Thank you for any help

[QuakeCH]

Hello,

Any developpers or modo know how to resolve this issue ?

Thank you

[Jean-Baptiste Kempf]

Not really, this has changed a lot the latest days, so ask on IRC or on the ml.

[QuakeCH]

This problem still happend with 30.01.2008 Nightly build

[publicENEMY]

It also happens when you try to stream h.264.

[QuakeCH]

This happend if I switch to UDP so that's not a problem with UDP.

But I have a theory :
Main Server send Informations about SPS/PPS to the relay server then the relay server found that the Stream is a NAL_SPS and NAL_PPS. But he don't relay to the client because for him it's ok. So I think that there is no implementation of relaying headers to the clients.

Main Server[h264] -> Header sent -> Relay Server[h264] -> No header (because don't know that he have to sent this data) -> Client[h264]

So the only one solution that I found is : To retranscode the stream

But the problem isn't resolved in self !

[QuakeCH]

Solution :
Edit the file : modules/packetizer/h264.c

Find this part of code.

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if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) ) { block_ChainRelease( p_sys->p_frame ); msg_Warn( p_dec, "waiting for SPS/PPS" ); /* Reset context */ p_sys->slice.i_frame_type = 0; p_sys->p_frame = NULL; p_sys->b_slice = VLC_FALSE; }

And replace by

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if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) ) { block_ChainRelease( p_sys->p_frame ); msg_Warn( p_dec, "waiting for SPS/PPS" ); /* Reset context */ p_sys->slice.i_frame_type = 0; p_sys->p_frame = NULL; p_sys->b_slice = VLC_FALSE; } else p_sys->slice.i_frame_type = BLOCK_FLAG_TYPE_I;

Then make clean and make again. Don't forget to make install for libs (if necessary).

You can become this kind of warning on your VLC client (doesn't seem that everyone receive this messages)

main warning: output date isn't PTS date, requesting resampling (-41240)
main warning: buffer is 54806 in advance, triggering downsampling

[QuakeCH]

Bug confirmed by Dev Team.

[cable007]

hello,

something new about this bug ?

because I have exactly the same but with 0.8.6

I try to relay without transcode again and get only audio, and in "logs" tons of "waiting for sps/pps"

thanks

nicolas