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<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">This is in regard of gstreamer 0.10.36</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">As it seems, using rtspsrc with multicast streams uses an internal buffer size of 8192 bytes for the video udp/rtp buffer (udpsrc0) and ignores the given udp-buffer-size parameter value.
</p>
<p class="MsoNormal">If the same cmd line is executed with protocols=1 (e.g. unicast), the udp-buffer-size parameter is respected and used internally on udpsrc0.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Having a small udp-buffer-size of 8192 leads to regular drops of udp buffers in our use case and thus to image artefacts.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Please have a look at the two following command lines/debug/logging outputs:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">C:\Users\Barco>gst-launch-0.10 rtspsrc location="rtsp://192.168.182.114/mgs-video?launch=barcomgsp%20uri-in=rtp://239.180.45.1:47806%3Fencoding-name%3DH264" protocols=2 udp-buffer-size=1048576 ! decodebin2 ! ffmpegcolorspace ! d3dvideosink
sync=false</p>
<p class="MsoNormal">Setting pipeline to PAUSED ...</p>
<p class="MsoNormal">Pipeline is live and does not need PREROLL ...</p>
<p class="MsoNormal">Setting pipeline to PLAYING ...</p>
<p class="MsoNormal">New clock: GstSystemClock</p>
<p class="MsoNormal">0:00:00.109200000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:792:gst_udpsrc_start:<udpsrc0> allocating socket for 239.1.24.27:29460</p>
<p class="MsoNormal">0:00:00.124800000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:803:gst_udpsrc_start:<udpsrc0> got socket 328</p>
<p class="MsoNormal">0:00:00.124800000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:805:gst_udpsrc_start:<udpsrc0> setting reuse 1</p>
<p class="MsoNormal">0:00:00.124800000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:812:gst_udpsrc_start:<udpsrc0> binding on port 29460</p>
<p class="MsoNormal">0:00:00.140400000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:881:gst_udpsrc_start:<udpsrc0> have udp buffer of 8192 bytes</p>
<p class="MsoNormal">0:00:00.140400000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:905:gst_udpsrc_start:<udpsrc0> joining multicast group 239.1.24.27</p>
<p class="MsoNormal">0:00:00.156000000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:914:gst_udpsrc_start:<udpsrc0> bound, on port 29460</p>
<p class="MsoNormal">0:00:00.156000000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:792:gst_udpsrc_start:<udpsrc1> allocating socket for 239.1.24.27:29461</p>
<p class="MsoNormal">0:00:00.171600000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:803:gst_udpsrc_start:<udpsrc1> got socket 344</p>
<p class="MsoNormal">0:00:00.171600000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:805:gst_udpsrc_start:<udpsrc1> setting reuse 1</p>
<p class="MsoNormal">0:00:00.187200000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:812:gst_udpsrc_start:<udpsrc1> binding on port 29461</p>
<p class="MsoNormal">0:00:00.187200000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:881:gst_udpsrc_start:<udpsrc1> have udp buffer of 8192 bytes</p>
<p class="MsoNormal">0:00:00.202800000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:905:gst_udpsrc_start:<udpsrc1> joining multicast group 239.1.24.27</p>
<p class="MsoNormal">0:00:00.218400000 2040 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:914:gst_udpsrc_start:<udpsrc1> bound, on port 29461</p>
<p class="MsoNormal">^C</p>
<p class="MsoNormal">C:\Users\Barco>gst-launch-0.10 rtspsrc location="rtsp://192.168.182.114/mgs-video?launch=barcomgsp%20uri-in=rtp://239.180.45.1:47806%3Fencoding-name%3DH264" protocols=1 udp-buffer-size=1048576 ! decodebin2 ! ffmpegcolorspace ! d3dvideosink
sync=false</p>
<p class="MsoNormal">Setting pipeline to PAUSED ...</p>
<p class="MsoNormal">Pipeline is live and does not need PREROLL ...</p>
<p class="MsoNormal">Setting pipelin0e: 0t0o: 0P0L.A0Y7I8N0G0 0.0..0</p>
<p class="MsoNormal"> 4824Ne w0 0c0l0o0c0k0:0 0G2s7tCS7y3sCt0e mCloDcEkB</p>
<p class="MsoNormal">G udpsrc gstudpsrc.c:792:gst_udpsrc_start:<udpsrc0> allocating socket for 0.0.0.0:0</p>
<p class="MsoNormal">0:00:00.093600000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:803:gst_udpsrc_start:<udpsrc0> got socket 320</p>
<p class="MsoNormal">0:00:00.093600000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:805:gst_udpsrc_start:<udpsrc0> setting reuse 0</p>
<p class="MsoNormal">0:00:00.109200000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:812:gst_udpsrc_start:<udpsrc0> binding on port 0</p>
<p class="MsoNormal">0:00:00.109200000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:861:gst_udpsrc_start:<udpsrc0> setting udp buffer of 1048576 bytes</p>
<p class="MsoNormal">0:00:00.109200000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:881:gst_udpsrc_start:<udpsrc0> have udp buffer of 1048576 bytes</p>
<p class="MsoNormal">0:00:00.124800000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:914:gst_udpsrc_start:<udpsrc0> bound, on port 64216</p>
<p class="MsoNormal">0:00:00.124800000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:917:gst_udpsrc_start:<udpsrc0> notifying port 64216</p>
<p class="MsoNormal">0:00:00.140400000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:792:gst_udpsrc_start:<udpsrc1> allocating socket for 0.0.0.0:64217</p>
<p class="MsoNormal">0:00:00.140400000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:803:gst_udpsrc_start:<udpsrc1> got socket 336</p>
<p class="MsoNormal">0:00:00.140400000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:805:gst_udpsrc_start:<udpsrc1> setting reuse 0</p>
<p class="MsoNormal">0:00:00.156000000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:812:gst_udpsrc_start:<udpsrc1> binding on port 64217</p>
<p class="MsoNormal">0:00:00.156000000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:881:gst_udpsrc_start:<udpsrc1> have udp buffer of 8192 bytes</p>
<p class="MsoNormal">0:00:00.156000000 4824 00000000027C73C0 DEBUG udpsrc gstudpsrc.c:914:gst_udpsrc_start:<udpsrc1> bound, on port 64217</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">As you can see, the setting of the buffer size is not included/executed when protocols is set to 2.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Any idea/explanation where to search for /how to fix?</p>
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