[libcamera-devel] Getting 30fps from libcamerasrc

[Pavel Machek]

Hi!

> > So... with some hacks, I can get 30fps 2MPix recording on
> > pinephone... from the "cam" utility. Which will have trouble with
> > audio.
> 
> Indeed :-) "cam" is meant to be a test tool, not an end-user
> application, so you've certainly reached the limits of its scope if you
> want audio.

Yes. I'm just wondering if three letter name is too short for such
a testing tool... and at some point we'll need
this-takes-pictures-and-records-videos-on-phones application.

> > When I try to use libcamerasrc (and gstreamer), I get down to 10fps or
> > so, but it looks more like artifical limit then performance one. Is it
> > so? How can I request 30fps?
> 
> What gstreamer pipeline do you use ? I don't have a pinephone, but
> running
> 
> GST_PLUGIN_PATH=$(pwd)/src/gstreamer gst-launch-1.0 \
> 	libcamerasrc camera-name='\\_SB_.PCI0.RP05.PXSX.TBL3.TBTU.RHUB.UB32-2:1.0-046d:0893' ! \
> 	'video/x-raw,width=1280,height=720' ! \
> 	fpsdisplaysink sync=0 text-overlay=false video-sink=glimagesink -v
> 
> on my laptop with a UVC webcam gives me 30fps. Can you try something
> similar, possibly using the a fakesink first, on the pinephone ?
>

So I went down to 160x120, and did not get 30fps, not with
fpsdisplaysink, not with other stuff. I'm using JPEG
(not enough memory bandwidth to unached RAM for anything else).

fpsdisplaysink needs jpeg decoding, which is cpu hungry, so I'm
using fakesink with num-buffers and time the whole pipeline.

CPU is not at 100% during testing. I'll get exact commands when
I'm near computer.

Best regards,
							Pavel
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