Changes between Version 9 and Version 10 of linux/media

Timestamp:

06/05/2019 10:40:40 PM (6 years ago)

Author:

Tim Harvey

Comment:

fix typo and added note about adv7180 rolling

linux/media

@@ -299 +299 @@
 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).
 
+Note that for many Analog decoder chips such as the adv7180 used on Ventana you must stop and re-start streaming if you lose or gain signal lock (ie Analog video input is disconnected and reconnected or simply connected after streaming starts). This is because many analog video decoders end up producing some incomplete frames right after lock and these frames must be discarded or they will confuse the IMX6. There is no support for discarding the first few frames in mainline linux at this time, but you can use the following patch which is included in Gateworks 4.20 media kernel: https://github.com/Gateworks/linux-imx6/commit/fcab532
+
 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
 
@@ -347 +349 @@
 [=#v4l2-ctl]
 == Capture examples
-With the assumption that you have already configured your capture device (see [#media-ctl-setup above) and set it to the {{{DEVICE}}} env variable the following examples are useful examples for capture and streaming:
+With the assumption that you have already configured your capture device (see [#media-ctl-setup above]) and set it to the {{{DEVICE}}} env variable the following examples are useful examples for capture and streaming:
 
 Examples:
@@ -361 +363 @@
 [=#gstreamer]
 == GStreamer Capture, Dispaly, and Stream Examples
-With the assumption that you have already configured your capture device (see [#media-ctl-setup above) and set it to the {{{DEVICE}}} env variable the following examples are useful examples for capture and streaming:
+With the assumption that you have already configured your capture device (see [#media-ctl-setup above]) and set it to the {{{DEVICE}}} env variable the following examples are useful examples for capture and streaming: