topic Re: Can't open camera with OpenCV in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/Can-t-open-camera-with-OpenCV/m-p/1025049#M151477 <HTML><HEAD></HEAD><BODY><P>Hello song,</P><P></P><P>Error may be caused by i2c errors, one can debug it with oscilloscope in ov5640 I2C probe function ov5640_probe() or similar if other sensor was used</P><P><A data-content-finding="Community" href="https://community.nxp.com/external-link.jspa?url=https%3A%2F%2Fsource.codeaurora.org%2Fexternal%2Fimx%2Flinux-imx%2Ftree%2Fdrivers%2Fmedia%2Fplatform%2Fmxc%2Fcapture%2Fov5640.c%3Fh%3Dimx_4.19.35_1.1.0" rel="nofollow" target="_blank">ov5640.c\capture\mxc\platform\media\drivers - linux-imx - i.MX Linux kernel</A>&nbsp;</P><P></P><P></P><P>You can debug it using AN4553 Using Open Source Debugging</P><P>Tools for Linux on i.MX Processors<BR /><A class="" data-content-finding="Community" href="https://community.nxp.com/external-link.jspa?url=https%3A%2F%2Fwww.nxp.com%2Fdocs%2Fen%2Fapplication-note%2FAN4553.pdf" rel="nofollow" target="_blank">https://www.nxp.com/docs/en/application-note/AN4553.pdf</A></P></BODY></HTML> Fri, 17 Jan 2020 15:58:36 GMT Bio_TICFSL 2020-01-17T15:58:36Z Can't open camera with OpenCV https://community.nxp.com/t5/i-MX-Processors/Can-t-open-camera-with-OpenCV/m-p/1025048#M151476 <HTML><HEAD></HEAD><BODY><P><SPAN style="border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; color: #51626f; font-family: arial,helvetica,sans-serif; font-size: 10pt; font-style: inherit; font-variant: normal; font-weight: inherit; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; vertical-align: baseline; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px; padding: 0px; margin: 0px; border: 0px none currentColor;">I tried some basic example code to get a picture from my camera </SPAN><SPAN style="border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; color: #51626f; font-family: arial,helvetica,sans-serif; font-size: 10pt; font-style: inherit; font-variant: normal; font-weight: inherit; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; vertical-align: baseline; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px; padding: 0px; margin: 0px; border: 0px none currentColor;">with OpenCV, but all I get is the following error:</SPAN></P><P><SPAN style="-webkit-text-stroke-width: 0px; border: 0px none currentColor; border-image-source: none; padding: 0px; border-image-slice: 100%; margin: 0px; color: #000011; border-image-repeat: stretch; white-space: normal; font-weight: inherit; border-image-width: 1; letter-spacing: normal; text-decoration: none; vertical-align: baseline; font-size: small; font-style: inherit; text-transform: none; word-spacing: 0px; font-variant: normal; text-indent: 0px; border-image-outset: 0; font-family: arial,helvetica,sans-serif; orphans: 2; text-align: left; ">VIDEOIO ERROR: libv4l unable to ioctl S_FMT<BR />VIDEOIO ERROR: libv4l unable to ioctl VIDIOCSPICT</SPAN></P><P><SPAN style="-webkit-text-stroke-width: 0px; border: 0px none currentColor; border-image-source: none; padding: 0px; border-image-slice: 100%; margin: 0px; color: #000011; border-image-repeat: stretch; white-space: normal; font-weight: inherit; border-image-width: 1; letter-spacing: normal; text-decoration: none; vertical-align: baseline; font-size: small; font-style: inherit; text-transform: none; word-spacing: 0px; font-variant: normal; text-indent: 0px; border-image-outset: 0; font-family: arial,helvetica,sans-serif; orphans: 2; text-align: left; ">why?</SPAN></P><P><SPAN style="-webkit-text-stroke-width: 0px; border: 0px none currentColor; border-image-source: none; padding: 0px; border-image-slice: 100%; margin: 0px; color: #000011; border-image-repeat: stretch; white-space: normal; font-weight: inherit; border-image-width: 1; letter-spacing: normal; text-decoration: none; vertical-align: baseline; font-size: small; font-style: inherit; text-transform: none; word-spacing: 0px; font-variant: normal; text-indent: 0px; border-image-outset: 0; font-family: arial,helvetica,sans-serif; orphans: 2; text-align: left; ">camera:ov5640 or mipi ov5640</SPAN></P><P><SPAN style="-webkit-text-stroke-width: 0px; border: 0px none currentColor; border-image-source: none; padding: 0px; border-image-slice: 100%; margin: 0px; color: #000017; border-image-repeat: stretch; white-space: normal; font-weight: inherit; border-image-width: 1; letter-spacing: normal; text-decoration: none; vertical-align: baseline; font-size: small; font-style: inherit; text-transform: none; word-spacing: 0px; font-variant: normal; text-indent: 0px; border-image-outset: 0; font-family: arial,helvetica,sans-serif; orphans: 2; text-align: left; ">Development board:imx6q</SPAN></P></BODY></HTML> Fri, 17 Jan 2020 06:47:52 GMT https://community.nxp.com/t5/i-MX-Processors/Can-t-open-camera-with-OpenCV/m-p/1025048#M151476 zhiyuan_song 2020-01-17T06:47:52Z Re: Can't open camera with OpenCV https://community.nxp.com/t5/i-MX-Processors/Can-t-open-camera-with-OpenCV/m-p/1025049#M151477 <HTML><HEAD></HEAD><BODY><P>Hello song,</P><P></P><P>Error may be caused by i2c errors, one can debug it with oscilloscope in ov5640 I2C probe function ov5640_probe() or similar if other sensor was used</P><P><A data-content-finding="Community" href="https://community.nxp.com/external-link.jspa?url=https%3A%2F%2Fsource.codeaurora.org%2Fexternal%2Fimx%2Flinux-imx%2Ftree%2Fdrivers%2Fmedia%2Fplatform%2Fmxc%2Fcapture%2Fov5640.c%3Fh%3Dimx_4.19.35_1.1.0" rel="nofollow" target="_blank">ov5640.c\capture\mxc\platform\media\drivers - linux-imx - i.MX Linux kernel</A>&nbsp;</P><P></P><P></P><P>You can debug it using AN4553 Using Open Source Debugging</P><P>Tools for Linux on i.MX Processors<BR /><A class="" data-content-finding="Community" href="https://community.nxp.com/external-link.jspa?url=https%3A%2F%2Fwww.nxp.com%2Fdocs%2Fen%2Fapplication-note%2FAN4553.pdf" rel="nofollow" target="_blank">https://www.nxp.com/docs/en/application-note/AN4553.pdf</A></P></BODY></HTML> Fri, 17 Jan 2020 15:58:36 GMT https://community.nxp.com/t5/i-MX-Processors/Can-t-open-camera-with-OpenCV/m-p/1025049#M151477 Bio_TICFSL 2020-01-17T15:58:36Z