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Gstreamer h264 decoding latency on iMX6

Question asked by Joel Colledge on Feb 19, 2013
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Hi all,


I am using an iMX6 quad to decode and display a live h264 encoded video feed using gstreamer.  I am using the following pipeline:

appsrc block=true is-live=true !

h264parse !

queue max-size-time=0 max-size-buffers=0 !

vpudec low-latency=true frame-plus=1 framedrop=false !

mfw_v4lsink device=/dev/video17 sync=false async=false

However I have found that there is a 12 frame delay between pushing a buffer into the appsrc, and it being displayed.


This may be connected to the following message that mfw_v4lsink is printing:

>>V4L_SINK: Actually buffer status:

        hardware buffer : 12

        software buffer : 0


Does anyone have any suggestions about how to reduce this delay?


I have attached a test application which demonstrates the problem.





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