GES 1.14.3 -- Timeline does not play smoothly

[David Ing]

I am on Ubuntu 18.04 and I have built Gstreamer 1.14.3 using gst-build.
I'm running it in an uninstalled mode.

I have a 17-second GESTimeline which basically shows a few JPEG images in a
sequence (from one images to the next), and in the lower-right corner I
have a video overlaid on top of the images.  There is also an audio track.

You can find my timeline.xges file and all of the supporting files here:

https://drive.google.com/drive/folders/1cAx-ubSH0q1T13TQjmUFyks6D5y3C_LE?usp=sharing


When I use the command `ges-launch-1.0 --load=timeline.xges`, the video
seems to skip (it does not play smoothly).

I did not see any logs come through the console when I used
ges-launch-1.0.  However, I have another project which constructs the
GESTimeline programmatically, and then runs it inside of a GstPipeline.
You will find the applications logs (including Gstreamer logs) inside the
folder (logs/*.log).

What happens is:  The pipeline tries to move from READY to PAUSED but it
cannot transition to PAUSED within the time that I allowed (30 seconds).  I
see plenty of warnings in the logs/*.log file which I have saved off.  I
wonder if those logs provide a clue about the problem that I'm facing.  I
also saved off the pipeline graphs in the logs folder (including SVG files).

In case you are wondering why I am using a GstPipeline instead of a
GESPipeline, see the link below.  I made sure wire the "query-position"
signal as discussed in the thread.

http://gstreamer-devel.966125.n4.nabble.com/GES-1-12-Multiple-encodings-to-multiple-files-td4687555.html#a4687557
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