topic Re: iMX6Q camera gstream error in i.MX Processors

iMX6Q camera gstream error

shlomiperlman — Thu, 14 Jan 2016 16:06:17 GMT

Hi,

when i try to use gsteram im getting these errors::

(camera:236): GStreamer-CRITICAL **: gst_value_list_get_value: assertion 'index < VALUE_LIST_SIZE (value)' failed

(camera:236): GStreamer-CRITICAL **: gst_value_init_and_copy: assertion 'G_IS_VALUE (src)' failed

(camera:236): GStreamer-CRITICAL **: gst_structure_id_take_value: assertion 'G_IS_VALUE (value)' failed

they are printed endlessly on the screen and i cant get any images nor with any other application. (like cat..)

any help appreciated, thanks!

Re: iMX6Q camera gstream error

kubiznak_petr — Thu, 14 Jan 2016 16:39:49 GMT

Hi shlomi,

I don't suppose anyone can answer your question without providing more detailed information. Mainly:

Camera type
Used application (gst-launch or anything else?)
GStreamer pipeline

Generally I'd guess your pipeline is invalid. If using a USB camera, did you try to launch it on PC?

Re: iMX6Q camera gstream error

shlomiperlman — Thu, 14 Jan 2016 17:23:26 GMT

Hi,

its a camera sensor gc0309 galaxy on ipu0/csi0 and its recognized and attached as the driver loads ok (or so it seems..)

i used gst-launch-1.0 and another camera app that worked with a usb webcam for testing.

when doing cat on dev/video0 i can see raw data running on the screen.

Re: iMX6Q camera gstream error

igorpadykov — Mon, 18 Jan 2016 01:02:38 GMT

Hi shlomi

one can check what sensor format is used: default BSP supports

only YUYV (ov5642 sensor). So for rgb565 one can look at

How to Support RGB565 Gated Mode Input to i.MX6 CSI

First recommended to try unit tests, refer to attached Linux Manual

sect.5.5.2 Video4Linux API test, Porting Guide Chapter 7 Supporting the

i.MX 6 Camera Sensor Interface CSI0

Best regards

igor

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Re: iMX6Q camera gstream error

shlomiperlman — Mon, 18 Jan 2016 10:10:28 GMT

Hi,

my sensor's default (and current) mode is YUYV but when i set

sensor->pix.pixelformat = V4L2_PIX_FMT_YUYV;

in the driver i get nothing from it, only when

sensor->pix.pixelformat = V4L2_PIX_FMT_RGB565;

is set, i'm getting the video stream..

any idea?

thanks,

Re: iMX6Q camera gstream error

igorpadykov — Mon, 18 Jan 2016 10:30:42 GMT

one can check how many cycles per pixel outputs sensor

and compare with Table 66 Camera Input Signal Cross Reference, Format, and Bits Per Cycle

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf

~igor