<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><br class=""></div></div></div></div><div><blockquote type="cite" class=""><div class="">On Jan 6, 2017, at 5:45 PM, Sebastian Dröge <<a href="mailto:sebastian@centricular.com" class="">sebastian@centricular.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On Fri, 2017-01-06 at 16:14 +0800, Yi-Lung Tsai wrote:<br class=""><blockquote type="cite" class="">There is a function named "activate_pull" in GstBaseSink indicating a<br class="">sink could be in pull-mode.<br class="">I wonder is it possible to develop a videosink in pull-mode for<br class="">playback purpose.<br class="">If so, is there any example or sample code to do similar tasks?<br class=""></blockquote><br class="">In theory that would be possible, but it's completely untested and will<br class="">probably not work without further changes. And most importantly, you<br class="">will need an element in front of your sink that can actually be pulled<br class="">from.<br class=""><br class="">There were some experiments with that in 0.10 times and audio sinks,<br class="">but not much came out of that because IIRC the advantages were rather<br class="">minimal and did not warrant the added complexity.<br class=""><br class=""><br class="">Why would you like to have a pull mode video sink?<br class=""><br class="">-- <br class="">Sebastian Dröge, Centricular Ltd · <a href="http://www.centricular.com_______________________________________________" class="">http://www.centricular.com_______________________________________________</a><br class="">gstreamer-devel mailing list<br class=""><a href="mailto:gstreamer-devel@lists.freedesktop.org" class="">gstreamer-devel@lists.freedesktop.org</a><br class="">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel<br class=""></div></div></blockquote></div><div class=""><br class=""></div><div class="">Thanks for the information.</div><div class=""><br class=""></div><div class="">We have an existing rendering engine for image and video.</div><div class="">However, it is designed in pull mode, from the view point of pipeline.</div><div class="">I wrote a video sink to integrate push-mode pipeline and pull-mode rendering engine.</div><div class="">This makes things a bit complicated and we suffered performance issue.</div><div class=""><br class=""></div><div class="">Our strategy now is setting render-delay to get video frame earlier in video sink.</div><div class="">Then let rendering engine get the buffer and render the buffer at the right time.</div><div class="">We are still working on it, and meanwhile I tried to find alternatives.</div><div class="">But pull-mode video sink is more complicated than I thought.</div><br class=""><div class=""><div class="">--</div><div class="">Yi-Lung (Bruce) Tsai</div><div class=""><a href="mailto:wagamama.tsai@gmail.com" class="">wagamama.tsai@gmail.com</a></div></div><div class=""><br class=""></div></body></html>