Greetings everyone,
I am using Linux 4.14.31 on an IMX6 platform, with an MT9P031 sensor
attached to the ipu1_csi0 (parallel).
My Gstreamer version is 1.14.0 and v4l-utils version is 1.14.2.
The problem is that I am unable to set up a capture pipeline.
Even the simplest capture pipeline such as:
gst-launch-1.0 v4l2src device=/dev/video4 ! fakesink
returns the following error:
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Internal data stream error.
Additional debug info:
../../../../gstreamer-1.14.0/libs/gst/base/gstbasesrc.c(3055):
gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
I get the same error on any pipeline involving v4l2src.
I have set up the media entity links using:
media-ctl -l "'mt9p031 0-0048':0 -> 'ipu1_csi0_mux':1[1]"
media-ctl -l "'ipu1_csi0_mux':2 -> 'ipu1_csi0':0[1]"
media-ctl -l "'ipu1_csi0':2 -> 'ipu1_csi0 capture':0[1]"
And I configure the pads using:
media-ctl -V "'mt9p031 0-0048':0 [fmt:SGRBG8/640x480 field:none]"
media-ctl -V "'ipu1_csi0_mux':2 [fmt:SGRBG8/640x480 field:none]"
media-ctl -V "'ipu1_csi0':2 [fmt:SGRBG8/640x480 field:none]"
And I do not get any errors from these commands.
The output of "v4l2-ctl --all -d /dev/video4" is:
Driver Info (not using libv4l2):
Driver name : imx-media-captu
Card type : imx-media-capture
Bus info : platform:ipu1_csi0
Driver version: 4.14.31
Capabilities : 0x84200001
Video Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
Priority: 2
Format Video Capture:
Width/Height : 656/486
Pixel Format : 'GR16'
Field : None
Bytes per Line : 1312
Size Image : 637632
Colorspace : sRGB
Transfer Function : sRGB
YCbCr/HSV Encoding: ITU-R 601
Quantization : Full Range
Flags : ee8abea8
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 0
User Controls
exposure 0x00980911 (int) : min=1
max=1048575 step=1 default=1943 value=1943
gain 0x00980913 (int) : min=8 max=1024
step=1 default=8 value=8
horizontal_flip 0x00980914 (bool) : default=0 value=0
vertical_flip 0x00980915 (bool) : default=0 value=0
blc_auto 0x00981902 (bool) : default=1 value=1
blc_target_level 0x00981903 (int) : min=0 max=4095
step=1 default=168 value=168
blc_analog_offset 0x00981904 (int) : min=-255 max=255
step=1 default=32 value=32
blc_digital_offset 0x00981905 (int) : min=-2048
max=2047 step=1 default=40 value=40
fim_enable 0x00981990 (bool) : default=0 value=0
fim_num_average 0x00981991 (int) : min=1 max=64
step=1 default=8 value=8
fim_tolerance_min 0x00981992 (int) : min=2 max=200
step=1 default=50 value=50
fim_tolerance_max 0x00981993 (int) : min=0 max=500
step=1 default=0 value=0
fim_num_skip 0x00981994 (int) : min=0 max=256
step=1 default=2 value=2
fim_input_capture_edge 0x00981995 (int) : min=0 max=3
step=1 default=0 value=0
fim_input_capture_channel 0x00981996 (int) : min=0 max=1
step=1 default=0 value=0
Image Processing Controls
pixel_rate 0x009f0902 (int64) : min=54000000
max=54000000 step=1 default=54000000 value=54000000 flags=read-only
test_pattern 0x009f0903 (menu) : min=0 max=9
default=0 value=0
What confuses me here is that the Pixel Format shown by v4l2-ctl is
'GR16', which is not what I expected. And it seems like the media-ctl
pad configuration commands are unable to change the Pixel Format, even
though they do not return any errors.
I would really appreciate if anyone could help in debugging this issue.
Thanks and best regards,
Ibtsam Haq
