Allocate buffer duration with frame-rate value using GST_BUFFER_DURATION

[Shaf]

I am trying to stream multiple (.mp4) videos using RTSP pipeline. By using
appsrc push-buffer, I am able to push the buffer retrieved from appsink
pipeline [Thanks to nabble forum from where I took the bits and pieces to
work it out]. Everything works fine, but when I have video files with
different frame-rate, I noticed that there is a lag/stuck in video display.
Then I noticed that the behavior is due to the buffer duration.

In the needData callback of appsrc, the buffer is pushed as shown below.

GST_BUFFER_PTS(buffer) = ctx->timestamp;
GST_BUFFER_DURATION(buffer) = gst_util_uint64_scale_int(1001, GST_SECOND,
30000);
ctx->timestamp += GST_BUFFER_DURATION(buffer);
g_signal_emit_by_name(appsrc, "push-buffer", buffer, &ret);

I would like to change the scale based on frame-rate of the caps received
from the sample. Something like  gst_util_uint64_scale_int(<rate>,
GST_SECOND, <frames>). But the frame-rate that is received from the caps
structure is a char* 30000/1001. How can I pass the value of framerate to
create buffer Duration ?
Expected :  gst_util_uint64_scale_int(1001, GST_SECOND, 30000).

Note : Different video has different frame-rate, so I would like to do it
dynamically.

Or, is there any other way to achieve this ? Refer the attachment for the
rtsp server source.



// needData call-back function

void needData(GstElement *appsrc, guint unused, Context *ctx)
{
        GstFlowReturn ret;
        GstBuffer *buffer;
        GstStructure *capsstruct;
        GstSample *sample =
gst_app_sink_pull_sample(GST_APP_SINK(ctx->glblapp->sink));
        gint width, height;

        while (sample == NULL) {
                g_warning(" Waiting to fetch sample ");
                sample = gst_app_sink_pull_sample(GST_APP_SINK(ctx->glblapp->sink));
        }
       
        GstCaps *capsfromsink = fetch_caps(ctx->glblapp->sink, "sink");
        buffer = gst_sample_get_buffer(sample);
        //g_object_set(G_OBJECT(appsrc), "caps", gst_caps_from_string(videocaps),
NULL);
        if (capsfromsink != NULL) {
                g_object_set(G_OBJECT(appsrc), "caps", capsfromsink, NULL);
        }
       
        capsstruct = gst_caps_get_structure(capsfromsink, 0);
        if (gst_structure_has_field(capsstruct, "framerate")) {
           * /// here I get the framerate as 3000/1001/*
                gchar *framerate = gst_value_serialize(gst_structure_get_value(capsstruct,
"framerate"));
                g_free(framerate);
        }


        GST_BUFFER_PTS(buffer) = ctx->timestamp;
        GST_BUFFER_DURATION(buffer) = gst_util_uint64_scale_int(1001, GST_SECOND,
30000);
        ctx->timestamp += GST_BUFFER_DURATION(buffer);
        g_signal_emit_by_name(appsrc, "push-buffer", buffer, &ret);
        gst_sample_unref(sample);

}



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[Shaf]

I found the below solution working.

GstStructure *capsstruct;
gint rate = 1, frames = 30;

capsstruct = gst_caps_get_structure(caps, 0);
        if (gst_structure_has_field(capsstruct, FRAMERATE)) {
                const GValue *framerate_val = gst_structure_get_value(capsstruct,
FRAMERATE);
                 if (G_VALUE_TYPE(framerate_val) == GST_TYPE_FRACTION) {
                        frames = gst_value_get_fraction_numerator(framerate_val);
                        rate = gst_value_get_fraction_denominator(framerate_val);
                 }
        }
               
GST_BUFFER_PTS(buffer) = ctx->timestamp;
GST_BUFFER_DURATION(buffer) = gst_util_uint64_scale_int(rate, GST_SECOND,
frames);





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