gstreamer-devel Digest, Vol 129, Issue 16
Nicolas Dufresne
nicolas at ndufresne.ca
Tue Oct 12 14:15:33 UTC 2021
Le lundi 11 octobre 2021 à 14:43 +0000, Howling wong via gstreamer-devel a
écrit :
> Hi thanks
>
> > > Use your command or a variant -- v4l2-ctl --list-formats-ext -d
> > > /dev/video0
>
> This are the result
>
> ioctl: VIDIOC_ENUM_FMT
>
> Index [ 5628.245685] ov5640_mipi 3-003c: Please assign pixel format,
> t
> : 0
>
> Type : Video Capture
>
> Pixel Format: 'YUYV'
>
> Name : YUYV 4:2:2
>
> Size: Discrete 640x480
>
> Interval: Discrete 0.033s (30.000 fps)
>
> Size: Discrete 320x240
>
> Interval: Discrete 0.033s (30.000 fps)
>
> Size: Discrete 720x480
>
> Interval: Discrete 0.033s (30.000 fps)
>
> Size: Discrete 1280x720
>
> Interval: Discrete 0.033s (30.000 fps)
>
> Size: Discrete 1920x1080
>
> Interval: Discrete 0.033s (30.000 fps)
>
> Size: Discrete 2592x1944
>
> Interval: Discrete 0.067s (15.000 fps)
>
> Size: Discrete 0x0
>
> I do not think the camera would support 25 fp/sec.
>
> Btw is there way we can control the frame rate in the downstream, like when
> encoding to save file or send it to another src
You can use videorate element.
>
>
> Regards
>
> From: gstreamer-devel <gstreamer-devel-bounces at lists.freedesktop.org> on
> behalf of gstreamer-devel-request at lists.freedesktop.org
> <gstreamer-devel-request at lists.freedesktop.org>
> Sent: Monday, October 11, 2021 8:00 PM
> To: gstreamer-devel at lists.freedesktop.org
> <gstreamer-devel at lists.freedesktop.org>
> Subject: gstreamer-devel Digest, Vol 129, Issue 16
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> Today's Topics:
>
> 1. Re: Question on adjusting frame rate of pipeline
> (Marianna Smidth Buschle)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 11 Oct 2021 12:44:51 +0200
> From: Marianna Smidth Buschle <msb at qtec.com>
> To: gstreamer-devel at lists.freedesktop.org, watertreader at hotmail.com
> Subject: Re: Question on adjusting frame rate of pipeline
> Message-ID: <af5a6286-2a5e-794d-555b-b38f9688e642 at qtec.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Try adding --gst-debug=*:3 to the failing command line.
>
> If you are getting a non-negotiated error then it is because your source
> doesn't support a fps of 25.
>
> Fx my webcam only supports 10/1:
>
> msb at QTEC-P53-MSB-Debian:~/QtecGit/python-tests$ gst-launch-1.0 v4l2src !
> video/x-raw, framerate=5/1 ! fakesink --gst-debug=*:3
> PAUSERER r?rledning ...
> R?rledningen k?rer, og beh?ver ikke at blive PREROLL'ed ...
> R?rledningen er PREROLL'ed ...
> R?rledning s?ttes til AFSPIL ...
> New clock: GstSystemClock
> 0:00:00.132050019 18347 0x55e8e83d6f00 WARN basesrc
> gstbasesrc.c:3127:gst_base_src_loop:<v4l2src0> error: Internal data
> stream error.
> 0:00:00.132109933 18347 0x55e8e83d6f00 WARN basesrc
> gstbasesrc.c:3127:gst_base_src_loop:<v4l2src0> error: streaming stopped,
> reason not-negotiated (-4)
> FEJL: fra element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal
> data stream error.
> Yderligere fejls?gningsinformation:
> ../libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> streaming stopped, reason not-negotiated (-4)
> Execution ended after 0:00:00.000560010
> R?rledning s?ttes til NUL ...
> R?rledning frig?res ...
>
> If you install v4l-utils you can use: v4l2-ctl -d <videodev> --all
>
> And it will tell you what it supports:
>
> Video input : 0 (Camera 1: ok)
> Format Video Capture:
> ??? Width/Height????? : 1280/720
> ??? Pixel Format????? : 'YUYV' (YUYV 4:2:2)
> ??? Field???????????? : None
> ??? Bytes per Line??? : 2560
> ??? Size Image??????? : 1843200
> ??? Colorspace??????? : sRGB
> ??? Transfer Function : Default (maps to sRGB)
> ??? YCbCr/HSV Encoding: Default (maps to ITU-R 601)
> ??? Quantization????? : Default (maps to Limited Range)
> ??? Flags???????????? :
> Crop Capability Video Capture:
> ??? Bounds????? : Left 0, Top 0, Width 1280, Height 720
> ??? Default???? : Left 0, Top 0, Width 1280, Height 720
> ??? Pixel Aspect: 1/1
> Selection Video Capture: crop_default, Left 0, Top 0, Width 1280, Height
> 720, Flags:
> Selection Video Capture: crop_bounds, Left 0, Top 0, Width 1280, Height
> 720, Flags:
> Streaming Parameters Video Capture:
> ??? Capabilities???? : timeperframe
> ??? Frames per second: 10.000 (10/1)
>
> Best Regards
>
> Marianna
>
> > Hi
> >
> > I have a question on frame rate on gstreamer in coding. I have set a caps
> > filter after the video src (v4l2src)
> >
> > A code snippet
> > GstCaps *caps;
> > caps = gst_caps_new_simple("video/x-raw",
> > "width",
> > G_TYPE_INT, 640,
> > "height",
> > G_TYPE_INT, 480,
> > "framerate",
> > GST_TYPE_FRACTION, 30, 1,
> > "is-live",
> > G_TYPE_BOOLEAN, TRUE,
> > NULL);
> >
> > if((gst_element_link_filtered(src,
> > caps))!=TRUE)
> > {
> > g_print(" Could not link pipeline\n");
> > gst_object_unref (GST_OBJECT (pipeline));
> > return 0;
> > }
> >
> > I have 3 branches to the source (1) Display (2) Records (3) sending video
> > elsewhere. But it is only at caps, I define the size of video and the frame
> > rate to collect
> >
> > Video play smoothly. However when I changed to a lower value of framerate
> > to 25, the video refuse to play. I wonder why? isnt the lower framerate
> > would have lesser stress on the system resource
> >
> >
> > A little other experiment that I have done using command line:
> >
> > Pipeline play
> > > > gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640,
> > > > height=480, framerate=30/1 ! videoconvert ! autovideosink
> > Pipeline do not play
> > > > gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640,
> > > > height=480, framerate=25/1 ! videoconvert ! autovideosink
> > Would like suggestion on what to do next
> >
> > Thanks
>
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