[aravis] Re: Debugging latency & long pause issues with Blackfly camera...
- From: Emmanuel Pacaud <emmanuel@xxxxxxxxx>
- To: aravis@xxxxxxxxxxxxx
- Date: Tue, 15 Apr 2014 10:32:03 +0200
Hi,
Le lundi 14 avril 2014 à 21:53 +0200, Emmanuel Pacaud a écrit :
> > I'm not asking that anybody solve this (although, if you've seen this
> > sort of thing with the Blackfly, or other cameras and can tell me what
> > to fix, you would have my eternal gratitude), but if anybody has some
> > suggestions as to what I might look at, or what tools I might use, to
> > diagnose these pauses, I would be grateful.
>
> I have a blackfly camera with which I face some troubles similar to
> yours. I think it's due to the fact the register giving the Time Tick
> Frequency returns a wrong value. And this value is used to compute the
> image buffer timestamps.
I've changed the viewer in git master to always use host time for buffer
timestamp. It fixes issues I was seeing using my blackfly camera.
Using the gstreamer plugins, do-timestamp=true also allows to work with
a blackfly camera. It looks like there is around 100ms of latency in the
following pipeline, but I think it comes from the pipeline itself, not
aravissrc element:
gstreamer 0.10 version:
./gst-aravis-launch aravissrc do-timestamp=true !
video/x-raw-gray,bpp=8,depth=8 ! ffmpegcolorspace ! autovideosink
gstreamer 1.0 version:
./gst-aravis-launch aravissrc do-timestamp=true ! video/x-raw,format=GRAY8 !
videoconvert ! autovideosink
Cheers,
Emmanuel.
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