[libcamera-devel] Getting 30fps from libcamerasrc

[Laurent Pinchart]

Hi Pavel,

On Sat, Jul 30, 2022 at 07:48:19PM +0200, Pavel Machek wrote:
> 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.
> > 
> > > 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=$(pwd)/src/gstreamer gst-launch-1.0 \
> > 	libcamerasrc camera-name='\\_SB_.PCI0.RP05.PXSX.TBL3.TBTU.RHUB.UB32-2:1.0-046d:0893' ! \
> > 	'video/x-raw,width=1280,height=720' ! \
> > 	fpsdisplaysink sync=0 text-overlay=false video-sink=glimagesink -v
> > 
> > on my laptop with a UVC webcam gives me 30fps. Can you try something
> > similar, possibly using the a fakesink first, on the pinephone ?
> 
> I'm using this for testing:
> 
> export GST_PLUGIN_PATH=$(pwd)/build/src/gstreamer
> time gst-launch-1.0 libcamerasrc camera-name=/base/i2c-csi/rear-camera at 4c ! \
>  	image/jpeg,width=1280,height=720 ! \
> 	fakesink num-buffers=300
> 
> 300 buffers at 30fps should be 10 seconds, but it is 20 (Execution
> ended after 0:00:19.754754217).

Just checking, are you running the latest master branch ? There used to
be issues with the libcamerasrc element that would use a single buffer
only. This has been fixed some time ago.

> [15:21:14.721221932] [43406]  INFO Camera camera.cpp:1029 configuring streams: (0) 1280x720-JPEG
> Redistribute latency...
> Got EOS from element "pipeline0".
> Execution ended after 0:00:19.754754217
> Setting pipeline to NULL ...
> Freeing pipeline ...
> 1.28user 4.92system 27.17 (0m27.174s) elapsed 22.86%CPU
> 
> Thanks for the fpsdisplaysink hints. I can do:
> 
> export GST_PLUGIN_PATH=$(pwd)/build/src/gstreamer
> time gst-launch-1.0 libcamerasrc camera-name=/base/i2c-csi/rear-camera at 4c ! \
>         image/jpeg,width=1280,height=720 ! \
>         fpsdisplaysink sync=0 text-overlay=false video-sink=fakesink -v
> 
> But I still get 15 fps:
> 
> /GstPipeline:pipeline0/GstFPSDisplaySink:fpsdisplaysink0: last-message = rendered: 306, dropped: 0, current: 15.18, average: 15.25
> ^Chandling interrupt.
> Interrupt: Stopping pipeline ...
> Execution ended after 0:00:20.654809024
> 
> Same 15 fps with 1920x1080.
> 
> /GstPipeline:pipeline0/GstFPSDisplaySink:fpsdisplaysink0: last-message = rendered: 274, dropped: 0, current: 15.01, average: 15.09
> ^Chandling interrupt.
> Interrupt: Stopping pipeline ...
> Execution ended after 0:00:18.833098702
> 
> I noticed you are using raw, not JPEG; let me try that... I still get
> 15 fps.
> 
> Any ideas? Any idea why you are only getting 30fps? I assume your hw
> should be capable of getting 60fps at that resolution? What kind of
> fps do you get with cam?

My webcam's native frame rate is 30fps.

-- 
Regards,

Laurent Pinchart