Unable to link rtspsrc and tee

[shyam]

Hello,
           I am trying to display and record video from RTSP simultaneously.
I am using rtspsrc and tee in the pipeline. However I am not able to link
rtspsrc with tee. The same example works with a videotestsrc instead of
rtspsrc. What am I missing ?

Thanks,
Shyam



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[Nicolas Dufresne-5]

Le samedi 16 novembre 2019 à 19:43 -0600, shyam a écrit :
> Hello,
>            I am trying to display and record video from RTSP simultaneously.
> I am using rtspsrc and tee in the pipeline. However I am not able to link
> rtspsrc with tee. The same example works with a videotestsrc instead of
> rtspsrc. What am I missing ?
>

Provide more details of what you have tried and how it failed for you
in order to get appropriate help. Maybe you didn't realized that data
from rtspsrc is both encoded and RTP payloaded ?

regards,
Nicolas

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[shyam]

Hi Nicolas,

              I am very new to Gstreamer. I am trying to learn using
examples available in the net. The use-case I want to implement requires
display of live video streaming via RTSP and recording simultaneously in
metroska (mkv) format.Any guidance in this will be of great help.I still
need to get familiar with Gstreamer.


I got this code from internet. This works fine with source being
videotestsrc, but doesnot work with rtspsrc.
int main(int argc, char *argv[])
{
        /*******************************/
        if (!gst_debug_is_active()) {
                gst_debug_set_active(TRUE);
                GstDebugLevel dbglevel = gst_debug_get_default_threshold();
                if (dbglevel < GST_LEVEL_ERROR) {
                        dbglevel = GST_LEVEL_ERROR;
                        gst_debug_set_default_threshold(dbglevel);
                }
        }
        /*********************************/
        //signal(SIGINT, sigintHandler);
        gst_init(&argc, &argv);

        pipeline = gst_pipeline_new(NULL);

        src = gst_element_factory_make("rtspsrc", NULL);
        g_object_set(src, "location", "rtsp://location", NULL);

        tee = gst_element_factory_make("tee", "tee");

        encoder = gst_element_factory_make("x264enc", NULL);
        muxer = gst_element_factory_make("matroskamux", NULL);
        filesink = gst_element_factory_make("filesink", NULL);
        videoconvert = gst_element_factory_make("videoconvert", NULL);
        videosink = gst_element_factory_make("autovideosink", NULL);
        queue_display = gst_element_factory_make("queue", "queue_display");
        queue_record = gst_element_factory_make("queue", "queue_record");

        if (!pipeline || !src || !tee || !encoder || !muxer || !filesink ||
!videoconvert || !videosink || !queue_record || !queue_display) {
                g_error("Failed to create elements");
                return -1;
        }

        g_object_set(filesink, "location", "rec.mkv", NULL);
        g_object_set(encoder, "tune", 4, NULL); /* important, the encoder usually
takes 1-3 seconds to process this. Queue buffer is generally upto 1 second.
Hence, set tune=zerolatency (0x4) */

        gst_bin_add_many(GST_BIN(pipeline), src, tee, queue_record, encoder, muxer,
filesink, queue_display, videoconvert, videosink, NULL);
        if (!gst_element_link_many(src, tee, NULL)
                || !gst_element_link_many(tee, queue_record, encoder, muxer, filesink,
NULL)
                || !gst_element_link_many(tee, queue_display, videoconvert, videosink,
NULL)
                ) {
                g_error("Failed to link elements");
                return -2;
        }

        loop = g_main_loop_new(NULL, FALSE);

        bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
        gst_bus_add_signal_watch(bus);
        g_signal_connect(G_OBJECT(bus), "message", G_CALLBACK(message_cb), NULL);
        gst_object_unref(GST_OBJECT(bus));

        gst_element_set_state(pipeline, GST_STATE_PLAYING);

        g_print("Starting loop");
        g_main_loop_run(loop);

        return 0;
}



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[Nicolas Dufresne-5]

Le dimanche 17 novembre 2019 à 10:24 -0600, shyam a écrit :

> Hi Nicolas,
>
>               I am very new to Gstreamer. I am trying to learn using
> examples available in the net. The use-case I want to implement requires
> display of live video streaming via RTSP and recording simultaneously in
> metroska (mkv) format.Any guidance in this will be of great help.I still
> need to get familiar with Gstreamer.
>
>
> I got this code from internet. This works fine with source being
> videotestsrc, but doesnot work with rtspsrc.
> int main(int argc, char *argv[])
> {
> /*******************************/
> if (!gst_debug_is_active()) {
> gst_debug_set_active(TRUE);
> GstDebugLevel dbglevel = gst_debug_get_default_threshold();
> if (dbglevel < GST_LEVEL_ERROR) {
> dbglevel = GST_LEVEL_ERROR;
> gst_debug_set_default_threshold(dbglevel);
> }
> }
> /*********************************/
> //signal(SIGINT, sigintHandler);
> gst_init(&argc, &argv);
>
> pipeline = gst_pipeline_new(NULL);
>
> src = gst_element_factory_make("rtspsrc", NULL);
> g_object_set(src, "location", "rtsp://location", NULL);
>
> tee = gst_element_factory_make("tee", "tee");
>
> encoder = gst_element_factory_make("x264enc", NULL);
> muxer = gst_element_factory_make("matroskamux", NULL);
> filesink = gst_element_factory_make("filesink", NULL);
> videoconvert = gst_element_factory_make("videoconvert", NULL);
> videosink = gst_element_factory_make("autovideosink", NULL);
> queue_display = gst_element_factory_make("queue", "queue_display");
> queue_record = gst_element_factory_make("queue", "queue_record");
>
> if (!pipeline || !src || !tee || !encoder || !muxer || !filesink ||
> !videoconvert || !videosink || !queue_record || !queue_display) {
> g_error("Failed to create elements");
> return -1;
> }
>
> g_object_set(filesink, "location", "rec.mkv", NULL);
> g_object_set(encoder, "tune", 4, NULL); /* important, the encoder usually
> takes 1-3 seconds to process this. Queue buffer is generally upto 1 second.
> Hence, set tune=zerolatency (0x4) */
>
> gst_bin_add_many(GST_BIN(pipeline), src, tee, queue_record, encoder, muxer,
> filesink, queue_display, videoconvert, videosink, NULL);
> if (!gst_element_link_many(src, tee, NULL)
> || !gst_element_link_many(tee, queue_record, encoder, muxer, filesink,
> NULL)
> || !gst_element_link_many(tee, queue_display, videoconvert, videosink,
> NULL)
> ) {
> g_error("Failed to link elements");
> return -2;

Normally things should fail here.  rtspsrc have "sometimes" pad. See
[0] for more details. Another hint I'm giving you in advance, the
media-type coming out of rtspsrc is something like application/x-rtp,
while the videoconvert / encoder that you have after your tee wants
video/x-raw. Consider depayloading and decoding the stream first. As an
alternative, you may want to use uridecodebin instead of rtspsrc
directly.

[0] https://gstreamer.freedesktop.org/documentation/application-development/basics/pads.html?gi-language=c

> }
>
> loop = g_main_loop_new(NULL, FALSE);
>
> bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
> gst_bus_add_signal_watch(bus);
> g_signal_connect(G_OBJECT(bus), "message", G_CALLBACK(message_cb), NULL);
> gst_object_unref(GST_OBJECT(bus));
>
> gst_element_set_state(pipeline, GST_STATE_PLAYING);
>
> g_print("Starting loop");
> g_main_loop_run(loop);
>
> return 0;
> }
>
>
>
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