playbin: fails to play short mkv file with jpeg frame and empty audio and subtitle tracks

Submitted by Xavier Claessens @xclaesse

Link to original bug (#765051)

Description

Created attachment 325997
Short mkv file

The file attached has mjpeg video, probably just one frame.

Playing it with gst-launch-1.0 playbin uri=file://... I get that error:
0:00:00.144956663 11177 0x7f3f180248a0 WARN audiobasesink gstaudiobasesink.c:1142:gst_audio_base_sink_wait_event:<pulsesink0> error: Sink not negotiated before eos event.

But it plays fine (I can quickly see the frame) with: gst-launch-1.0 filesrc location=100616_20160414_103712126.mkv ! matroskademux ! jpegdec ! autovideosink

Attachment 325997, "Short mkv file":
100616_20160414_103712126.mkv