[vlc] Re: vlc stop when playing H.264 RTP stream

[Chris Dobbs]

Can u verify without using VLC that your H264 frames are ok? i.e play it from file or something. VLC will play h264 from file so maby try that first.

Your SDP looks ok although I'm not familiar with the specific h263 fmtp options, try just having
fmtp:96

your SDP states you are streaming to port 1100 so make sure your streamer is in fact doing this (obvious I know but...)

Run up ethereal and capture the first couple of packet and see if they look ok. Check that your RTP header payload type is in fact 96 and not the non-dynamic one (forget which number this is for H264...35?)

-Chris
  ----- Original Message ----- 
  From: jogging song 
  To: vlc at videolan.org 
  Sent: Friday, March 09, 2007 2:54 AM
  Subject: [vlc] Re: vlc stop when playing H.264 RTP stream


  Thanks, Chris
        Payload type in RTP header is 96.
    Before it is about to receive RTP stream, vlc need a SDP.  I'm not sure whether the sdp file is right.
  v=0
  m=video 1100 RTP/AVP 96
  b=AS:247
  a=rtpmap:96 H264/90000 
  a=fmtp:96 packetization-mode=1;profile-level-id=42001E;

  I read the RFC3984, and change it to the following.

  v=0
  m=video 1100 RTP/AVP 96
  b=AS:247
  a=rtpmap:96 H264/90000
  a=fmtp:96 packetization-mode=0;profile-level-id=42001E;sprop-parameteter-sets=Z0IAHpZ0Ficg,aM44gA== 

  It still doesn't work.

  The RTP stream consists of RTP of 300 frames. And only the first frame is an IDR frame(I frame), which has a sps and pps.
  All other frame is P frame.

  But VLC stops after printing the following things: 
  packetizer_h264 debug: found NAL_SPS
  packetizer_h264 debug: found NAL_PPS 
  I don't know why it stops after recognizing sps and pps.


  And i think sps and pps already are in sdp file, so I don't send sps and pps.
  Vlc will print "waiting for sps".

  Thanks
  jogging



  On 3/8/07, chris.2.dobbs at bt.com <chris.2.dobbs at bt.com > wrote:
    Not sure what that erro msg means but here are a few quick things to check:
    1. Are you setting the RTP payload to 96 in your stream?
    2. Are you setting correct timestamp framing intervals in your stream , think u need to increment rtp timestamp by 30Ms every time u start sending a new frame. Keep this timestamp constant for frames spanning several packets.
    3. Are you keeping the RTP SSRC at constant value all the way through?

    Can you post the first few packets here?- use ethereal or something to capture and I'll take a look.
    -Chris



----------------------------------------------------------------------------
    From: vlc-bounce at videolan.org [mailto:vlc-bounce at videolan.org] On Behalf Of jogging song
    Sent: 08 March 2007 12:52
    To: vlc at videolan.org
    Subject: [vlc] vlc stop when playing H.264 RTP stream


    hi,
        Now I use VLC to play H.264 RTP stream.I encounter some problems. Before it is about to receive RTP streams,  VLC read a SDP like this,
    v=0
    m=video 1100 RTP/AVP 96
    b=AS:247
    a=rtpmap:96 H264/90000
    a=fmtp:96 packetization-mode=1;profile-level-id=42001E;

    Then I send RTP packets, and VLC recieve them.But VLC stops after printing the following things:
    packetizer_h264 debug: found NAL_SPS
    packetizer_h264 debug: found NAL_PPS 

    Can anyone help me?Thanks
    Best Regards
    jogging






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