Changes between Version 8 and Version 9 of linux/media

Timestamp:

02/26/2019 10:31:07 PM (6 years ago)

Author:

Tim Harvey

Comment:

added more examples for linux-media pipeline setup

linux/media

@@ -279 +279 @@
 
 Examples:
- * Analog CVBS capture
-{{{#!bash
+ * Analog CVBS NTSC capture
+{{{#!bash
+v4l2-ctl --device /dev/v4l-subdev14 --set-standard NTSC
 ./media-ctl-setup adv7180 > setup
 /bin/sh setup
 }}}
+ * Analog CVBS PAL capture
+{{{#!bash
+v4l2-ctl --device /dev/v4l-subdev14 --set-standard PAL
+./media-ctl-setup adv7180 > setup
+/bin/sh setup
+}}}
  * Digital HDMI capture
 {{{#!bash
@@ -289 +296 @@
 /bin/sh setup
 }}}
+
+Note that it is required that you re-run the {{{media-ctl-setup}}} script and its generated output commands whenever the input source changes (ie Analog NTSC->PAL or HDMI input format (resolution/colorspace/framerate).
+
+To detect when the input changes on a capture source you can catch the {{{V4L2_EVENT_SOURCE_CHANGE}}} event via the {{{VIDIOC_DQEVENT}}} ioctl - see https://www.linuxtv.org/downloads/v4l-dvb-apis-old/vidioc-dqevent.html