<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><blockquote type="cite" class=""><div class="">Le 15 oct. 2017 à 17:03, Mailing List SVR <<a href="mailto:lists@svrinformatica.it" class="">lists@svrinformatica.it</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><div class="moz-cite-prefix" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; 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; background-color: rgb(255, 255, 255);">Il 15/10/2017 14:50, Jérôme Laheurte ha scritto:<br class=""></div><blockquote type="cite" cite="mid:A4CC512B-42B2-4B9E-B2DA-BD0916B3956D@jeromelaheurte.net" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; 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; background-color: rgb(255, 255, 255);" class=""><pre wrap="" class=""></pre><blockquote type="cite" class=""><pre wrap="" class="">Le 15 oct. 2017 à 14:45, Jérôme Laheurte <a class="moz-txt-link-rfc2396E" href="mailto:jerome@jeromelaheurte.net"><jerome@jeromelaheurte.net></a> a écrit :
So two week-ends later I kind of have a working dev environment and started working on <a class="moz-txt-link-freetext" href="https://bugzilla.gnome.org/show_bug.cgi?id=540131">https://bugzilla.gnome.org/show_bug.cgi?id=540131</a>. Unfortunately in the process I noticed that the use case (subtitle buffer arriving while another one hasn’t expired) now result in a kind of deadlock, and I’m not familiar enough with gstreamer to fully understand what is happening here. Some observations:
1. The text_chain method is blocked waiting for the previous buffer to get popped (at gstbasetextoverlay.c:2713)
2. But the video_chain method doesn’t get called any more. Since it’s the one popping old text buffers, everything stops.
3. There is nothing of interest in the debug output
This didn’t happen last time I tested a video with multiple concurrent subtitles, but that was a long time ago. It kind of looks like the text_chain and video_chain functions are now called by the same thread. Does anybody have any light to share on this ?
</pre></blockquote><pre wrap="" class="">More information, sorry:
* Video file: <a class="moz-txt-link-freetext" href="https://jeromelaheurte.net/owncloud/s/21E1m14sFOxfAmy">https://jeromelaheurte.net/owncloud/s/21E1m14sFOxfAmy</a>
* Pipeline: gst-launch-1.0 -v filesrc location=sub.mkv ! matroskademux name=demux ! queue ! vtdec ! subtitleoverlay name=overlay ! autovideosink demux. ! ssaparse ! overlay.</pre></blockquote><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; 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; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; 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; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class="">try to add a queue before ssaparse,</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; 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; background-color: rgb(255, 255, 255);" class=""></div></blockquote></div><br class=""><div class="">Nope, still deadlocking. Same place. If I’m not mistaken the queue ensures that the text_chain function is called in the queue’s thread, am I wrong ? So the problem is not as simple as I supposed.</div><div class=""><br class=""></div><div class="">Jérôme Laheurte</div><div class=""><br class=""></div></body></html>