GNOME Bugzilla – Bug 674151
[pitivi] Deadlocks when trying to play a particular AVI or OGG Theora clip in the timeline
Last modified: 2012-12-12 18:39:44 UTC
Created attachment 212092 [details] gdb thread apply all bt I encounter a deadlock 100% of the time when trying to play a particular AVI clip in the pitivi ges timeline. Attaching a gdb thread apply all bt.
Sample file: http://jeff.ecchi.ca/public/gstreamer-674151.avi
Another sample that is guaranteed to trigger the deadlock: http://mirror.cessen.com/blender.org/peach/trailer/trailer_400p.ogg
OK so briefly, the problem was with the get_state function in togglePlayback. With some clips, when you seek at a certain position, only part of the bins see their state set to PAUSED. So when you do a get_state on the pipeline, it never returns. What puzzles me is the logs from GST_DEBUG. When doing an "incomplete" seek, you will get this : 0:00:09.687979007 20400 0x7fbb30002a00 INFO GST_STATES gstbin.c:2910:bin_handle_async_done:<videosink> committing state from PAUSED to PAUSED, old pending PAUSED 0:00:09.688140586 20400 0x7fbb30002a00 INFO GST_STATES gstbin.c:2930:bin_handle_async_done:<videosink> completed state change, pending VOID 0:00:09.688203016 20400 0x7fbb30002a00 INFO GST_STATES gstbin.c:2910:bin_handle_async_done:<vbin> committing state from PAUSED to PAUSED, old pending PAUSED 0:00:09.688376366 20400 0x7fbb30002a00 INFO GST_STATES gstbin.c:2930:bin_handle_async_done:<vbin> completed state change, pending VOID When the seek is succesful, two more elements are added to this log : gestimelinepipeline1 and internal-sinks. I pushed a branch called deadlocks on my github that at least prevents the deadlocks.
Full-length version of the file from comment 1: http://jeff.ecchi.ca/public/gstreamer-674151-full.avi What's interesting is that if you "seek then try to toggle playback" (ie: not do playback from the start, or playback then seek), it only works in some specific areas: - from 0 to 1 second - at 32 seconds
The file from comment #1 and comment #4 doesn't seem to cause problems anymore. However, OGG Theora files such as the 480p big buck bunny trailer in comment #2 seem to seek/set the pipeline incorrectly. If you insert BBB in the a blank timeline first and then insert the other samples, it won't work, you'll get a black screen in the pitivi viewer. However, if you insert the other sample from comment #4 in the timeline first, seek it and then insert the BBB trailer, everything works (including the BBB trailer).
Yes I think I remember reporting that seeking with BBB was indeed wrong. However, I also remind seeing the same kind of problems in totem as well. For example, open the clip with the beast that goes "WAAAAHHHH" in totem, try to seek at the end, it will come back almost at the beginning. What thiblahute and I were thinking was that the file might be corrupt.
Can't reproduce anymore with my current build of pitivi and gst 1.0.2.