gsttextoverlay deadlock or something

[Jérôme Laheurte]

So two week-ends later I kind of have a working dev environment and started working on https://bugzilla.gnome.org/show_bug.cgi?id=540131 <https://bugzilla.gnome.org/show_bug.cgi?id=540131>. 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 ?

Thanks in advance
Jérôme Laheurte

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/gstreamer-devel/attachments/20171015/4b6b0add/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 842 bytes
Desc: Message signed with OpenPGP using GPGMail
URL: <https://lists.freedesktop.org/archives/gstreamer-devel/attachments/20171015/4b6b0add/attachment.sig>