2009/12/20 Němec Alexandr <[email protected]> > Dear all, > I have two questions regarding openRTSP. > 1. I have a H264 camera with built-in RTSP server (an IP camera) and I am > using openRTSP to receive the video stream. It works nice, I can receive > frames of type IDR slices and other coded slices. However, a standard H264 > also contains a SPS (sequence parameter set) NAL unit followed by a PPS > (picture parameter set) NAL unit followed by the first IDR frame. The IP > camera manufacturer confirmed that they include the SPS+PPS "header bytes" > before the very first IDR frame and also before some later IDR frames at > regular intervals. As I receive clean frames from live555 library without > SPS+PPS I ust want to ask, if there is the possibility to somehow get these > bytes, because I want to save them before the start of the stream. I tested > the incoming frames and the first byte tells me, that the frames are clean > IDR slices and other coded slices (NAL unit types 5 and 1). The SPS and PPS > "header bytes" are missing.
They should be populating the sprop-parameter-sets parameter in the SDP exchange with the SPS/PPS info (see RFC3984). Sending the info in-stream is not recommended and makes writing a decent client more difficult. Check the SDP exchange to see if they are correctly setting this; you should see someting like: sprop-parameter-sets=Z0IACpZTBYmI,aMljiA== ...the SPS and PPS info are base-64 encoded, and delimited with a comma. > 2. Is there a way to set a custom timeout value for the RTSP client that > the client would use for each command like PLAY, TEARDOWN or OPTIONS? I > would like to be able to change the timeout and to force the RTSP client to > complete a method master when the RTSP server is unavailable. I searched the > code and found some timeout parameters, but I am not sure that I am doing > the right thing. > Thanks very much in advance > Alex See the source code to openRTSP (and specifically, the method calls on RTSPc lient); there are several timeouts you can specify.
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