[gst-devel] converting a gst-launch pipeline into source code problem

[Terry Leung]

Hi all,

I got a problem when i convert a pipeline into source code
The pipeline is

gst-launch -m ffmux_3gp name=mux ! filesink location=/home/video/receive.3gp \
{ udpsrc num-buffers=500 port=8100 name=audioudp
caps="application/x-rtp, media=(string)audio, payload=(int)98,
clock-rate=(int)8000, encoding-name=(string)AMR,
encoding-params=(string)1, octet-align=(string)1" ! rtpamrdepay
queue-delay=0 ! queue } ! mux.audio_0

The code is shown below:

        m_pPipe = gst_pipeline_new ( (string("VideoPipe").append(sId)).c_str());

        m_pMux = gst_element_factory_make ("ffmux_3gp",
(string("ffmux_3gp").append(sId)).c_str());
        m_pFileSink = gst_element_factory_make
("filesink",(string("filesink").append(sId)).c_str() );

        m_pAudioUdpSrc= gst_element_factory_make ("udpsrc",
(string("audioudpsrc").append(sId)).c_str());
        m_pAudioJitter= gst_element_factory_make
("gstrtpjitterbuffer", (string("audiojitter").append(sId)).c_str());
        m_pAudioDepay= gst_element_factory_make ("rtpamrdepay",
(string("audiodepay").append(sId)).c_str());
        m_pAudioQueue= gst_element_factory_make ("queue",
(string("audioqueue").append(sId)).c_str());

        gst_bin_add_many (GST_BIN (m_pPipe),
        m_pMux , m_pFileSink ,
        m_pAudioUdpSrc , m_pAudioJitter , m_pAudioDepay , m_pAudioQueue ,NULL);

GstCaps* pAudioUdpSrcCaps = gst_caps_new_simple ("application/x-rtp",
        "media",G_TYPE_STRING,"audio",
        "payload",G_TYPE_INT,98,
        "clock-rate", G_TYPE_INT, 8000,
        "encoding-name", G_TYPE_STRING, "AMR",
        "encoding-params",G_TYPE_STRING,"1",
        "octet-align",G_TYPE_STRING,"1",
        NULL);
        nResult =
gst_element_link_filtered(m_pAudioUdpSrc,m_pAudioJitter,pAudioUdpSrcCaps);
        gst_caps_unref(pAudioUdpSrcCaps);

        nResult = gst_element_link (m_pMux,m_pFileSink);
        nResult = nResult &&
gst_element_link_many(m_pAudioJitter,m_pAudioDepay,m_pAudioQueue,m_pMux,NULL);


I am not sure if the pipeline is the same as the one in gst-launch
I've tried my best to do the same thing as what it is in the gst-launch
(As i've also write another program to stream 3gp clips to a specific
ip and port, and i can do it without problem, i think there may be
some tricks for this case?)

But when i try to play the pipeline, they are still the same(elements
become playing while the pipeline and filesink are not playing yet)
However, in the first case, when a stream come in, the pipeline and
filesink is set to playing
in the second case, no any message from bus

Anyone can tell me why it give such difference?