CM-T3730: Linux: Camera - Revision history

Lifshitz: /* GStreamer */

2014-02-16T11:43:37Z

‎GStreamer

Lifshitz: /* See also */

2013-10-27T11:32:51Z

‎See also

Ilya: /* Linux kernel */

2012-11-15T13:21:57Z

‎Linux kernel

Grinberg: /* Output to display */

2012-10-24T10:46:01Z

‎Output to display

Show changes

Lifshitz: /* Hardware Setup */

2012-06-05T06:16:12Z

‎Hardware Setup

Show changes

Lifshitz: /* Camera ISP data paths */

2012-05-10T12:30:28Z

‎Camera ISP data paths

Igor at 10:55, 10 May 2012

2012-05-10T10:55:36Z

Show changes

Grinberg: /* Snapshots */

2012-04-03T13:10:52Z

‎Snapshots

Grinberg: /* See also */

2012-04-03T11:35:32Z

‎See also

New page

== Overview ==

CM-T3730 Linux supports various camera devices connected either to the USB subsystem or to the camera interface (CIF). This article describes the USB camera setup and configuration and provides several usage examples.
Linux USB camera support is provided by USB Video Class (UVC) driver. All UVC compliant camera peripherals can be managed by the UVC driver.
Linux also supports various non UVC cameras, but with some limitations. Therefore non UVC cameras are not covered in this article.
Linux UVC driver implements the Video for Linux Two (V4L2) API.
V4L2 is a suite of driver specifications for different types of video devices and video-related data.
Examples in this article are using a AV301W-based camera.

== Linux kernel ==

All the use cases and examples in this article were tested with the CM-T3730 Linux package, that can be obtained from [http://compulab.co.il/products/computer-on-modules/cm-t3730/ CM-T3730 product webpage].

The following kernel configuration procedure is required:
* Enable "Multimedia support" in the "Device Drivers" submenu:
┌──────────────────────────────── Device Drivers ─────────────────────────────────┐
│ ┌────^(-)─────────────────────────────────────────────────────────────────────┐ │
│ │ [*] Watchdog Timer Support ---> │ │
│ │ Sonics Silicon Backplane ---> │ │
│ │ Broadcom specific AMBA ---> │ │
│ │ -*- Multifunction device drivers ---> │ │
│ │ -*- Voltage and Current Regulator Support ---> │ │
│ │ '''<*> Multimedia support''' ---> │ │
│ │ Graphics support ---> │ │
│ │ <*> Sound card support ---> │ │
│ │ [*] HID Devices ---> │ │
│ └────v(+)─────────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > │
└─────────────────────────────────────────────────────────────────────────────────┘

* Enable "Video For linux" and "Video capture adapters" in the "Multimedia support" submenu:
┌────────────────────────────── Multimedia support ───────────────────────────────┐
│ ┌─────────────────────────────────────────────────────────────────────────────┐ │
│ │ --- Multimedia support │ │
│ │ *** Multimedia core support *** │ │
│ │ [ ] Media Controller API (EXPERIMENTAL) │ │
│ │ '''<*> Video For Linux''' │ │
│ │ < > DVB for Linux │ │
│ │ *** Multimedia drivers *** │ │
│ │ <*> Remote Controller adapters ---> │ │
│ │ [ ] Load and attach frontend and tuner driver modules as needed │ │
│ │ [*] Customize analog and hybrid tuner modules to build │ │
│ │ Customize TV tuners ---> │ │
│ │ '''[*] Video capture adapters''' ---> │ │
│ │ [ ] Memory-to-memory multimedia devices ---> │ │
│ │ [*] Radio Adapters ---> │ │
│ └─────────────────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > │
└─────────────────────────────────────────────────────────────────────────────────┘

* Enable "OMAP2/OMAP3 V4L2-Display driver" and "V4L USB devices" in the "Video capture adapters" submenu:
┌──────────────────────────── Video capture adapters ─────────────────────────────┐
│ ┌────^(-)─────────────────────────────────────────────────────────────────────┐ │
│ │ [ ] Enable old-style fixed minor ranges for video devices │ │
│ │ [ ] Autoselect pertinent encoders/decoders and other helper chips │ │
│ │ <*> I2C module for IR │ │
│ │ Encoders, decoders, sensors and other helper chips ---> │ │
│ │ < > Virtual Video Driver │ │
│ │ < > VPFE Video Capture Driver │ │
│ │ '''<*> OMAP2/OMAP3 V4L2-Display driver''' │ │
│ │ < > CPiA2 Video For Linux │ │
│ │ < > Support for timberdale Video In/LogiWIN │ │
│ │ < > SR030PC30 VGA camera sensor support │ │
│ │ < > NOON010PC30 CIF camera sensor support │ │
│ │ < > SoC camera support │ │
│ │ '''[*] V4L USB devices''' ---> │ │
│ └─────────────────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > │
└─────────────────────────────────────────────────────────────────────────────────┘

* Enable "USB Video Class (UVC)" in "V4L USB devices" submenu:
┌──────────────────────────────── V4L USB devices ────────────────────────────────┐
│ ┌─────────────────────────────────────────────────────────────────────────────┐ │
│ │ --- V4L USB devices │ │
│ │ '''<*> USB Video Class (UVC)''' │ │
│ │ [*] UVC input events device support │ │
│ │ <M> GSPCA based webcams ---> │ │
│ │ < > Hauppauge WinTV-PVR USB2 support │ │
│ │ < > Hauppauge HD PVR support │ │
│ └────v(+)─────────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > │
└─────────────────────────────────────────────────────────────────────────────────┘

UVC camera and the driver do not need any special kernel command line parameters option.

== Video support validation ==

Check that your camera has been recognized correctly through the kernel debug messages log (using the {{cmd|dmesg}} command):
<pre>
usb 1-2.2: New USB device found, idVendor=1871, idProduct=0f01
usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-2.2: Product: USB2.0 Camera
usb 1-2.2: Manufacturer: AVEO Technology Corp.
usb 1-2.2: usb_probe_device
usb 1-2.2: configuration #1 chosen from 1 choice
usb 1-2.2: adding 1-2.2:1.0 (config #1, interface 0)
uvcvideo 1-2.2:1.0: usb_probe_interface
uvcvideo 1-2.2:1.0: usb_probe_interface - got id
uvcvideo: Found UVC 1.00 device USB2.0 Camera (1871:0f01)
input: USB2.0 Camera as /devices/platform/usbhs-omap.0/ehci-omap.0/usb1/1-2/1-2.2/1-2.2:1.0/input/input7
usb 1-2.2: adding 1-2.2:1.1 (config #1, interface 1)
</pre>

Also, the {{filename|/dev/video0}} device special file should be created.

== Playback and Streaming tools ==

Linux provides a variety of playback and streaming tools for the V4L2 compliant devices.
We provide several examples that do not necessarily require a X Window System to operate your camera and capture images.

=== MPlayer ===

MPlayer has support for most modern video and audio formats. MPlayer is highly configurable, and can be controlled by keyboard, mouse, joystick or remote control (with LIRC).
MPlayer package is included in the CM-T3730 Angstrom Linux root filesystem image.

==== Output to display ====

Following command can be used to stream the camera output to the display using default configuration settings.
<pre>
mplayer tv:// -vo omapfb
</pre>
Press '''q''' or '''ESC''' to stop playing and quit program.<br>
Adding more parameters will do some customization as shown below.
<pre>
mplayer tv:// -tv driver=v4l2:width=800:height=600:device=/dev/video0:brightness=80:contrast=10:saturation=-30 -fs -vf mirror -vo omapfb
</pre>

Parameters description:
{|class="wikitable" cellpadding="3" border="1" style="border: 1px solid rgb(85, 85, 85); border-collapse: collapse;"
|-
|{{cmd|mplayer tv://}} || Stream data using TV capture module
|-
|{{parameter|-tv}} || This option tunes various properties of the TV capture module (see below).
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=driver=v4l2}}
|}
|| Set TV input driver.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=width=800:height=600}}
|}
|| Output window width and height.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=device=/dev/video0}}
|}
|| Specify TV device.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=brightness=80:contrast=10:saturation=-30}}
|}
|| Set the image equalizer.
|-
|{{parameter|-fs}} || Fullscreen playback. Note: {{parameter|-fs}} is not necessarily supported by all MPlayer video output drivers.
|-
|{{parameter|-vf}} || Video filters allow modification of the video stream and its properties.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|mirror}}
|}
|| Mirrors the image on the Y axis.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=screenshot}}
|}
|| Allows acquiring screenshots of the movie. Make sure that the {{parameter|screenshot}} filter is the last filter, so the exact picture on the display will be saved.
|-
|{{parameter|-vo}} || Specifies MPlayer video output driver.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|omapfb}}
|}
|| TI OMAP video frame buffer output.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=xv}}
|}
|| Separate output window if using X Window System.
|}

{{Note| To start X Window application (e.g. MPlayer) from your serial console, the {{parameter|DISPLAY}} environment variable must be set.}}

Additional example for streaming camera output to a separate window in the X Window system:
<pre>
mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0 -vo xv
</pre>

==== Snapshots ====

[[Image:Usb_camera_screenshoot.png|thumb|right|200px|640x480 Camera screenshot]]
To take snapshots, run the MPlayer with the following command line:
<pre>
mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0 -vf screenshot -vo omapfb
</pre>
Once there is an output streamed on the display, press {{parameter|s}} to take a snapshot. Each snapshot will be saved in your current directory as shotXXXX.png.
<br style="clear: both" />
==== Playback ====

To play a movie, run the MPlayer with the following command line:
<pre>mplayer media_file.ogg -vo omapfb</pre>

=== GStreamer ===

GStreamer is a pipeline-based multimedia framework that allows you to create a variety of media-handling software components.
This includes simple audio playback, audio and video playback, recording, streaming, and editing.
The pipeline design allows you to easily write any type of streaming multimedia application.
GStreamers capabilities are extended through plugins. Several simple media manipulations are demonstrated below.

==== Installation ====
For the GStreamer to function properly, there are several packages that need to be installed. Those can be found on the [http://www.angstrom-distribution.org/ The Ångström Distribution] official website.

* To install the basic GStreamer set, use the following command:
<pre>
opkg install libxml2_2.7.8-r9.1.6_armv7a.ipk libgcc1_4.5-r47+svnr184907_armv7a.ipk libc6_2.12-r28_armv7a.ipk libffi5_3.0.10-r0_armv7a.ipk \
libz1_1.2.6-r1_armv7a.ipk libglib-2.0-0_2.30.3-r0_armv7a.ipk gstreamer_0.10.36-r0_armv7a.ipk libxcb1_1.8.1-r0_armv7a.ipk \
libxv1_1.0.7-r0_armv7a.ipk libuuid1_2.21-r5_armv7a.ipk libudev0_182-r0_armv7a.ipk libgudev-1.0-0_182-r0_armv7a.ipk \
libgstinterfaces-0.10-0_0.10.36-r1_armv7a.ipk libgstvideo-0.10-0_0.10.36-r1_armv7a.ipk --force-overwrite
</pre>

* For GStreamer to support Video4Linux2 and several plugins for manipulating the output stream, the following needs to be installed:
<pre>
opkg install gst-plugins-good-video4linux2_0.10.31-r0_armv7a.ipk gst-plugin-videorate_0.10.35-r1_armv7a.ipk \
gst-plugin-ffmpegcolorspace_0.10.35-r1_armv7a.ipk gst-plugin-ximagesink_0.10.35-r1_armv7a.ipk
</pre>

* To support encoding with Theora codec (required if you want to save the encoded video to a file), the following needs to be installed:
<pre>
opkg install libogg0_1.3.0-r0_armv7a.ipk libtheora_1.1.1-r1_armv7a.ipk libgsttag-0.10-0_0.10.36-r1_armv7a.ipk gst-plugin-theora_0.10.35-r1_armv7a.ipk \
libgstpbutils-0.10-0_0.10.36-r1_armv7a.ipk libgstaudio-0.10-0_0.10.36-r1_armv7a.ipk libgstriff-0.10-0_0.10.36-r1_armv7a.ipk \
gst-plugin-ogg_0.10.35-r1_armv7a.ipk --force-overwrite
</pre>

==== Validation ====

[[Image:Gstreamer-videotestsrc.jpeg|thumb|right|200px|GStreamer source test output]]

To validate the installation of the GStreamer components, launch {{cmd|gst-inspect}} GStreamer utility.

Testing the basic streaming to OMAP frame buffer:
<pre>
gst-launch videotestsrc ! omapdmaifbsink
</pre>
<br style="clear: both" />
==== Streaming to display ====

To start streaming the video to display the simple GStreamer pipeline can be used.
The basic GStreamer pipeline should have at least the source of the stream and the output sink specified.<br>
The below example streams the video from the V4L2 {{filename|/dev/video0}} device to the OMAP frame buffer (sink) with several stream manipulations applied.
<pre>
gst-launch v4l2src device=/dev/video0 ! 'video/x-raw-yuv,format=(fourcc)YUY2,width=640,height=480' ! videorate ! ffmpegcolorspace ! omapdmaifbsink
</pre>

Pipeline parameters in details:
{|class="wikitable" cellpadding="3" border="1" style="border: 1px solid rgb(85, 85, 85); border-collapse: collapse;"
|-
|{{parameter|v4l2src}} || Element for reading frames from a Video4Linux2 device.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=device=/dev/video0}}
|}
|| Specify the V4L2 {{filename|/dev/video0}} device as a stream source.
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=always-copy=false}}
|}
|| Disable copying of the stream buffers. This can slightly improve the GStreamer performance.
|-
|{{parameter|1=video/x-raw-yuv,format=(fourcc)YUY2,width=640,height=480}} || Link the source to a ''capability'', which is defined by a mime type and a few optional properties. The properties are: video and resolution.
|-
|{{parameter|videorate}} || Use each frame of the source stream and feed it to the next element at the requested framerate.
|-
|{{parameter|ffmpegcolorspace}} || Make the color space conversion, required by the sink element.
|-
|{{parameter|omapdmaifbsink}} || Define the OMAP frame buffer as the output sink. Sink can be: a file, screen or a network. For X Window System, the {{parameter|ximagesink}} parameter can be used.
|}

==== Streaming to a file ====

To encode and save the output stream to a file, using the Theora codec, run the following command:
<pre>
gst-launch v4l2src ! 'video/x-raw-yuv,width=320,height=240' ! queue ! videorate ! 'video/x-raw-yuv,framerate=10/1' ! ffmpegcolorspace ! \
theoraenc ! queue ! oggmux ! filesink location=media_file.ogg
</pre>

Parameters in details:
{|class="wikitable" cellpadding="3" border="1" style="border: 1px solid rgb(85, 85, 85); border-collapse: collapse;"
|-
|{{parameter|queue}} || Provides a buffer for the next element in the pipeline.
|-
|{{parameter|theoraenc}} || Encodes raw video into theora stream.
|-
|{{parameter|oggmux}} || Muxes a stream into an ogg container.
|-
|{{parameter|filesink}} || Writes the incoming data to a file.
|}

==== Streaming to a file and display ====

Following command splits the source stream and links to the frame buffer and to an encoded file:

<pre>
gst-launch v4l2src always-copy=false ! 'video/x-raw-yuv,width=320,height=240' ! tee name=t_video ! queue ! videorate ! ffmpegcolorspace ! \
omapdmaifbsink t_video. ! queue ! videorate ! 'video/x-raw-yuv,framerate=10/1' ! ffmpegcolorspace ! theoraenc ! \
queue ! oggmux ! filesink location=media_file.ogg
</pre>

{|class="wikitable" cellpadding="3" border="1" style="border: 1px solid rgb(85, 85, 85); border-collapse: collapse;"
|-
|{{parameter|tee}} || Split data to multiple streams (element pads).
|-
|
{|cellpadding="0" cellspacing="0" width="100%"
|width="30px"| || {{parameter|1=name=t_video}}
|}
|| Names the element's pad. {{parameter|t_video}} is then linked to theora encoder.
|}

==== File playback ====
To play a movie encoded by Theora codec and saved in ogg contaner, use the following command line:
<pre>
gst-launch filesrc location=media_file.ogg ! oggdemux ! theoradec ! ffmpegcolorspace ! omapdmaifbsink
</pre>

== See also ==

* [http://www.ideasonboard.org/uvc/ Linux UVC driver and tools]
* [http://www.mplayerhq.hu/ MPlayer official resource]
* [http://gstreamer.freedesktop.org/ GStreamer official resource]
* [http://www.cin.ufpe.br/~cinlug/wiki/index.php/Introducing_GStreamer Introducing GStreamer]
* [https://gstreamer.ti.com/gf/project/gstreamer_ti/ GStreamer TI Plugin]
* [http://www.angstrom-distribution.org/repo/ Ångström Distribution Feed browser]
* [[CM-T3730: Linux: Getting started]]
* [[CM-T3730: Linux: Angstrom]]
* [[CM-T3730: Linux: Kernel]]
* [[CM-T3530: Linux: Video playback]]
* [[Linux Development for ARM modules]]

[[Category:Linux]]
[[Category:CM-T3730]]

@@ Line 29: / Line 29: @@
 All the use cases and examples in this article were tested with the [http://compulab.co.il/products/computer-on-modules/cm-t3730/#devres CM-T3730 Linux package].
-Kernel boot options and additional boot loader settings for hardware accelerated video stream encoding are described in [[CM-T3730: Linux: Angstrom#Kernel_parameters | Angstrom]] and [[CM-T3730: Linux: Video Playback#Boot_Loader_and_Linux_Kernel| Video Playback]] articles.
+Kernel boot options and additional boot loader settings for hardware accelerated video stream encoding are described in [[CM-T3730: Linux: Angstrom#Kernel_parameters | Angstrom]], [[CM-T3730: Linux: Debian#Kernel_parameters | Debian]] and [[CM-T3730: Linux: Video Playback#Boot_Loader_and_Linux_Kernel| Video Playback]] articles.
 The following kernel configuration procedure is required :
@@ Line 199: / Line 199: @@
 The {{cmd|media-ctl}} command line tool can be used to manipulate the Media Device through the Media Controller API.
 This tool allows to enumerate media entities and their pads, set/get and enumerate links between pads of different entities, define pads data format.
-{{cmd|media-ctl}} package is included in the CM-T3730 Angstrom Linux root filesystem image.
+{{cmd|media-ctl}} package is included in the CM-T3730 Angstrom and Debian Linux root filesystem images.
 == Explore Media Device ==
@@ Line 378: / Line 378: @@
 == yavta ==
-{{cmd|yavta}} (“Yet Another V4L2 Test Application”) is a data capture tool that allows to enumerate and set V4L2 device controls like brightness, exposure, autofocus etc. This is a generic tool that can be applied to any V4L2 compliant device. {{cmd|yavta}} package is included in the CM-T3730 Angstrom Linux root filesystem image.
+{{cmd|yavta}} (“Yet Another V4L2 Test Application”) is a data capture tool that allows to enumerate and set V4L2 device controls like brightness, exposure, autofocus etc. This is a generic tool that can be applied to any V4L2 compliant device. {{cmd|yavta}} package is included in the CM-T3730 Angstrom and Debian Linux root filesystem images.
 === Configure V4L2 device ===
@@ Line 541: / Line 541: @@
 MPlayer has support for most modern video and audio formats. MPlayer is highly configurable, and can be controlled by keyboard, mouse, joystick or remote control (with LIRC).
-MPlayer package is included in the CM-T3730 Angstrom Linux root filesystem image.
+{{Note| MPlayer package is included in the CM-T3730 Angstrom Linux root filesystem image only.}}
 === Streaming to display ===
@@ Line 717: / Line 717: @@
 This article demonstrates streaming and encoding video from camera with and without hardware acceleration capabilities of CM-T3730.
 Please refer to [[CM-T3730: Linux: Video Playback | Video Playback]] article to get an overview of GStreamer framework, validate instalation and hardware acceleration support.
-GStreamer package is included in the CM-T3730 Angstrom Linux root filesystem image.
+GStreamer package is included in the CM-T3730 Angstrom and Debian Linux root filesystem images.
 === Streaming to display ===
@@ Line 1,147: / Line 1,147: @@
 * [[CM-T3730: Linux: Getting started]]
 * [[CM-T3730: Linux: Angstrom]]
 * [[CM-T3730: Linux: Kernel]]
 * [[CM-T3730: Linux: Angstrom#Digital_Video_SDK | CM-T3730: Linux: Angstrom - Digital Video SDK]]
 * [[CM-T3730: Linux: Video Playback]]
 * [[Video Input Port Adapter Board]]

@@ Line 27: / Line 27: @@
 = Linux kernel =
-All the use cases and examples in this article were tested with the CM-T3730 Linux package (currently based on kernel v3.0.y) that can be obtained from [http://compulab.co.il/products/computer-on-modules/cm-t3730/ CM-T3730 product webpage].
+All the use cases and examples in this article were tested with the [http://compulab.co.il/products/computer-on-modules/cm-t3730/#devres CM-T3730 Linux package].
 Kernel boot options and additional boot loader settings for hardware accelerated video stream encoding are described in [[CM-T3730: Linux: Angstrom#Kernel_parameters | Angstrom]] and [[CM-T3730: Linux: Video Playback#Boot_Loader_and_Linux_Kernel| Video Playback]] articles.
@@ Line 1,140: / Line 1,140: @@
 * [http://www.ideasonboard.org/uvc/ Linux UVC driver and tools]
-* [http://www.ideasonboard.org/uvc/ Camera ISP Driver]
+* [http://www.omappedia.org/wiki/Camera-ISP_Driver Camera ISP Driver]
 * [http://www.mplayerhq.hu/ MPlayer official resource]
 * [http://gstreamer.freedesktop.org/ GStreamer official resource]

@@ Line 24: / Line 24: @@
 == Linux kernel ==
-All the use cases and examples in this article were tested with the CM-T3730 Linux package (currently based on kernel v.3.0) that can be obtained from [http://compulab.co.il/products/computer-on-modules/cm-t3730/ CM-T3730 product webpage].
+All the use cases and examples in this article were tested with the CM-T3730 Linux package (currently based on kernel v3.0) that can be obtained from [http://compulab.co.il/products/computer-on-modules/cm-t3730/ CM-T3730 product webpage].
 The following kernel configuration procedure is required:
@@ Line 229: / Line 229: @@
 The following chart shows various pipelines relevant to MT9T031 sensor that produces RAW Bayer 10bit image data.
-[[Image:Isp_data_path.png|450px|center|Camera ISP Data Path]]
+[[Image:Isp_data_path.jpg|450px|center|Camera ISP Data Path]]
 RAW data are processed by the CCDC module and are directly pipelined to the Preview engine(1). Another way is to output directly from the CCDC to memory (C). In the Preview block, the format is converted from RAW data to YUV4:2:2. The data can be output to memory (4) or pipelined to the Resizer (2). The rescaled YUV4:2:2 image is finally stored in memory (3).

@@ Line 1,143: / Line 1,143: @@
 * [http://www.mplayerhq.hu/ MPlayer official resource]
 * [http://gstreamer.freedesktop.org/ GStreamer official resource]
 * [https://gstreamer.ti.com/gf/project/gstreamer_ti/ GStreamer TI Plugin]
 * [http://www.angstrom-distribution.org/repo/ Ångström Distribution Feed browser]

@@ Line 208: / Line 208: @@
 Once there is an output streamed on the display, press {{parameter|s}} to take a snapshot. Each snapshot will be saved in your current directory as shotXXXX.png.
 <br style="clear: both" />
 ==== Playback ====