feat(linux): wave5: Add FFMPEG Encode commands

Wave5 driver has been updated to make it operable with FFMPEG. Update
documentation with relevant commands to expose this feature to customers.

Signed-off-by: Brandon Brnich <[email protected]>

Author: b-brnich

source/linux/Foundational_Components_Multimedia_wave5.rst

@@ -4,6 +4,8 @@
 Multimedia Video Codec
 ######################
 
+.. _multimedia-wave5-introduction:
+
 ************
 Introduction
 ************
@@ -638,6 +640,35 @@ To pipe the output from ffmpeg to ffplay with hardware acceleration, the followi
 
    ffmpeg -re -codec:v hevc_v4l2m2m -i input.h265 -fps_mode passthrough -f rawvideo - | ffplay -framerate 30 -video_size 1920x1080 -f rawvideo -autoexit -
 
+FFMPEG also has support to use V4L2 HW accelerators for video encoding. The following command is an example for encoding a raw video by using the Wave5 IP:
+
+.. code-block:: console
+
+    ffmpeg -f rawvideo -pix_fmt yuv420p -s:v 352x288 -r 30 -i <input_video>.yuv -c:v h264_v4l2m2m <output_video>.h264 -y -nostdin
+
+The following is the equivalent command if H265 encoding is required.
+
+.. code-block:: console
+
+    ffmpeg -f rawvideo -pix_fmt yuv420p -s:v 352x288 -r 30 -i <input_video>.yuv -c:v hevc_v4l2m2m <output_video>.h265 -y -nostdin
+
+.. note::
+
+    352x288 above is just an example resolution. Update this value to properly reflect the resolution of the raw video. 
+
+FFMPEG can also capture video by using cameras attached to the device. See the following for an example.
+
+.. code-block:: console
+
+    ffmpeg -f v4l2 -framerate 30 -video_size 1280x720 -i /dev/video3 -c:v h264_v4l2m2m <video_destination>
+
+Remember that the Wave5 does have HW requirements for the raw video; refer to :ref:`multimedia-wave5-introduction` for these constraints. If the video being
+captured is a resolution not aligned to the HW requirements, FFMPEG can pad the video to make it compliant with HW. The following command accomplishes this.
+
+.. code-block:: console
+
+    ffmpeg -f rawvideo -pix_fmt yuv420p -s 1920x1080 -r 30 -i <1080p_input_video>.yuv -vf "pad=width=1920:height=1088:x=0:y=0:color=black" -c:v h264_v4l2m2m <output_video>.h264
+
 To print out the packet's data and payload data in hexadecimal from a given multimedia stream named :file:`foo.h265`, the following can be used:
 
 .. code-block:: console