Added matroska option to VideoEncoder example (altnerative to ffmpeg)

docs/source/components/nodes/script.rst

@@ -120,6 +120,24 @@ In the script node you can interface with GPIOs of the VPU using module GPIO. Cu
   GPIO.PullDownUp: GPIO.PULL_NONE, GPIO.PULL_DOWN, GPIO.PULL_UP
   GPIO.Edge: GPIO.RISING, GPIO.FALLING, GPIO.LEVEL_HIGH, GPIO.LEVEL_LOW
 
+Here's **an example** of toggling GPIO pin 40 inside Script node from the host (via :ref:`XLinkIn`). On `OAK-SoM-Pro <https://docs.luxonis.com/projects/hardware/en/latest/pages/BW2099.html>`__,
+GPIO 40 drives FSYNC signal for both 4-lane cameras, and we have used the code below for this exact reason.
+
+.. code-block:: python
+
+  import GPIO
+  MX_PIN = 40
+
+  ret = GPIO.setup(MX_PIN, GPIO.OUT, GPIO.PULL_DOWN)
+  toggleVal = True
+
+  while True:
+    data = node.io['in'].get()  # Wait for a message from the host computer
+
+    node.warn('GPIO toggle: ' + str(toggleVal))
+    toggleVal = not toggleVal
+    ret = GPIO.write(MX_PIN, toggleVal)  # Toggle the GPIO
+
 Using DepthAI :ref:`Messages <components_messages>`
 ###################################################
 

docs/source/includes/container-encoding.rst

@@ -1,3 +1,14 @@
 Encoded bitstream (either MJPEG, H264, or H265) from the device can also be **saved directly into .mp4 container**
 with no computational overhead on the host computer. See `demo here <https://github.com/luxonis/depthai-experiments/tree/master/gen2-container-encoding>`__
-for more information.
+for more information.
+
+**Matroska**
+
+Besides ``ffmpeg`` and ``.mp4`` video container (which is patent encumbered), you could also use the ``mkvmerge``
+(see `MKVToolNix <https://mkvtoolnix.download/doc/mkvmerge.html>`__ for GUI usage) and ``.mkv`` video container
+to mux encoded stream into video file that is supported by all major video players
+(eg. `VLC <https://www.videolan.org/vlc/>`__)
+
+.. code-block::
+
+    mkvmerge -o vid.mkv video.h265