* #12426: sdp/video: don't bother parsing empty SDP descriptions

daemon/src/sip/sdp.cpp

@@ -473,7 +473,7 @@ string Sdp::getIncomingVideoDescription() const
 
     if (videoIdx == activeLocalSession_->media_count) {
         DEBUG("No video present in local session");
-        return ss.str();
+        return "";
     }
 
     // get direction string

daemon/src/video/video_rtp_session.cpp

@@ -53,13 +53,17 @@ void VideoRtpSession::updateSDP(const Sdp &sdp)
 {
     string desc(sdp.getIncomingVideoDescription());
     // if port has changed
-    if (desc != rxArgs_["receiving_sdp"]) {
+    if (not desc.empty() and desc != rxArgs_["receiving_sdp"]) {
         rxArgs_["receiving_sdp"] = desc;
         DEBUG("Updated incoming SDP to:\n %s",
               rxArgs_["receiving_sdp"].c_str());
     }
 
-    if (desc.find("sendrecv") != string::npos) {
+    if (desc.empty()) {
+        DEBUG("Video is inactive");
+        receiving_ = false;
+        sending_ = false;
+    } else if (desc.find("sendrecv") != string::npos) {
         DEBUG("Sending and receiving video");
         receiving_ = true;
         sending_ = true;