Seek and playback of multiple low resolution videos

[Jack D]

Greetings,

I have two applications. One will create a long command string to capture 9
videos simultaneously using ffmpeg, encoding with vp9.. Five of the videos
are 800x480 and the other four are 1280x960. My other application is a
greatly modified version of the tutorial
https://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/tree/gst-sdk/tutorials/basic-tutorial-5.c.
I have modified it to play all nine videos at once. They all play well
together except when I drag the seek bar. When I drag the seek bar, it
takes a very long time for all the videos to be updated to the same
position, and when it is finished, the videos are out of sync. I have
timestamps embedded in the videos to observe this detail. Also, by
observing the system monitor resources, all the cpus are at 100% while the
seek is being performed.
Now, I can do the same thing with nine 1920x1080 videos that are encoded
with h264 and the resources are not totally consumed nor does it take a
long time to update.
Is this a problem with using these low resolution videos encoded with vp9?
Since this occurs during a seek, I did not think hardware acceleration for
vp9 would be of any help. I have not yet tried encoding the lower
resolution videos with h264 as from the capture side, that process takes a
lot resources.
This is with Centos 7, GStreamer version 1.8.3.
Thanks,
Jack
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