rtspsrc: Skip PTs with caps incompatible to the global caps

Otherwise empty caps are created while all following code assumes that
the caps will have exactly one structure, and then run into assertions.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4343>

diff --git a/subprojects/gst-plugins-good/gst/rtsp/gstrtspsrc.c b/subprojects/gst-plugins-good/gst/rtsp/gstrtspsrc.c
index c431447..bf389f8 100644 (file)
--- a/subprojects/gst-plugins-good/gst/rtsp/gstrtspsrc.c
+++ b/subprojects/gst-plugins-good/gst/rtsp/gstrtspsrc.c
@@ -2301,6 +2301,13 @@ gst_rtspsrc_collect_payloads (GstRTSPSrc * src, const GstSDPMessage * sdp,
     outcaps = gst_caps_intersect (caps, global_caps);
     gst_caps_unref (caps);
 
+    if (gst_caps_is_empty (outcaps)) {
+      GST_WARNING_OBJECT (src,
+          " skipping pt %d with caps conflicting with the global caps", pt);
+      gst_caps_unref (outcaps);
+      continue;
+    }
+
     /* the first pt will be the default */
     if (stream->ptmap->len == 0)
       stream->default_pt = pt;