{"id":7840,"date":"2011-02-08T22:28:46","date_gmt":"2011-02-08T11:28:46","guid":{"rendered":"http:\/\/yewenyi.net\/wpblog\/?p=7840"},"modified":"2011-02-08T22:28:46","modified_gmt":"2011-02-08T11:28:46","slug":"the-tale-of-a-skype-video-call","status":"publish","type":"post","link":"https:\/\/yewenyi.net\/wp\/old\/?p=7840","title":{"rendered":"The tale of a Skype Video Call"},"content":{"rendered":"<p style=\"text-align: justify\">I have been doing a few <a href=\"http:\/\/www.skype.com\" target=\"_blank\" rel=\"noopener noreferrer\">skype video<\/a> calls recently. I do not know how, but on the last one a debug window popped up. So here are some stats from the call. Mostly the video holds together, though occasionally the packet loss becomes too great and we have to restart the video. It is good this can be redone without reconnecting the call. This happens more often in my transmit direction. A round trip is enormous! the round trip should be around 9 ms not the 190 ms\u00a0to 204 ms\u00a0in these measurements. I deliberately included a high loss and low loss period. The high loss periods do not seem to occur so often, maybe every 5 to 10 minutes, but there is occasionally a no loss period. 76.7% is a lot of packet loss. Interestingly I am sending video at a rate of 438 kbit\/s but only receiving it at 192 kbit\/s.\u00a0Jitter is moderately high at 44 to 121 ms. This is above the minimum you would expect on an IP network with it&#8217;s poor jitter control, but not as bad as the 3000 ms that some\u00a0video codecs allow for.<\/p>\n<p style=\"text-align: justify\">All in all I&#8217;d say that the video is acceptable and useable. Once we have more bandwidth it should be better.<\/p>\n<table border=\"1\" cellspacing=\"5\" cellpadding=\"5\" width=\"100%\">\n<tbody>\n<tr>\n<th>Stat 1<\/th>\n<th>Stat 2<\/th>\n<\/tr>\n<tr>\n<td width=\"50%\">Call Debug Info:\u00a0ObjID: 813Codec: SILK_V3<br \/>\nJitter: 44<br \/>\nSample rates: e-24000, d-16000<br \/>\nPacket loss: 0.6% (798)<br \/>\nSend packet loss: 0.7%\/0.7%<br \/>\nRecv packet loss: 0.5%\/0.5%<br \/>\nRoundtrip: 190ms<br \/>\nNBM: audio 5000 \/ 20 ms \u00a0video 56893 corr 0%<br \/>\nSessionOut: UDP (247282 packets)<br \/>\nSessionIn: UDP (268848 packets)<br \/>\nRelays: 0<br \/>\nUDP status local:Good remote:Good<br \/>\nCPU usage: 47.1% 59.7% hicc:0<br \/>\nVideo send:FPS 15 (cam:16 bw:30 cpu:46(35) rcv:84(0)) cmp 4 cpu 47 640&#215;480 PS 0 438 Kbit<br \/>\nVideo recv:FPS 15.0(15.0) 640&#215;480 BW:192.0 FPSrep 100(100) Codec: VP71<\/td>\n<td>Call Debug Info:\u00a0ObjID: 813Codec: SILK_V3<br \/>\nJitter: 121<br \/>\nSample rates: e-12000, d-12000<br \/>\nPacket loss: 0.6% (1238)<br \/>\nSend packet loss: 14.3%\/62.9%<br \/>\nRecv packet loss: 20.8%\/76.7%<br \/>\nRoundtrip: 204ms<br \/>\nNBM: audio 2000 \/ 60 ms \u00a0video 807 corr 0%<br \/>\nSessionOut: UDP (333414 packets)<br \/>\nSessionIn: UDP (356573 packets)<br \/>\nRelays: 0<br \/>\nUDP status local:Good remote:Good<br \/>\nCPU usage: 32.0% 37.1% hicc:0<br \/>\nVideo send:FPS 8 (cam:16 bw:8 cpu:21(18) rcv:83(0)) cmp 3 cpu 39 640&#215;480 PS 0 8 Kbit<br \/>\nVideo recv:FPS 5.0(8.0) 640&#215;480 BW:21.0 FPSrep 140(100) Codec: VP71<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>I have been doing a few skype video calls recently. I do not know how, but on the last one[&#8230;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[1048,3350,3945],"class_list":["post-7840","post","type-post","status-publish","format-standard","hentry","category-ramblings","tag-debug","tag-skype","tag-video-call"],"_links":{"self":[{"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=\/wp\/v2\/posts\/7840"}],"collection":[{"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7840"}],"version-history":[{"count":0,"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=\/wp\/v2\/posts\/7840\/revisions"}],"wp:attachment":[{"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yewenyi.net\/wp\/old\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}