PowerShell Automation of FFMPEG

Want to create thumbnails from video files or convert from .ts to .mp4? FFMPEG can do it but the command line can be a bit tricky to figure out. There is a nice .Net library for automating ffmpeg that can be used in PowerShell. See NrecoSite

Example PowerShell:

# Download https://www.nrecosite.com/video_converter_net.aspx
# copy ffmpeg.exe to C:\Windows\SysWOW64\WindowsPowerShell\v1.0\
# Documentation - https://www.nrecosite.com/doc/NReco.VideoConverter/
$thumbnail = "D:\Capture\Conference_20170722_090251.png"
$video = "D:\Capture\Conference_20170722_090251.ts"

add-type -path 'C:\Users\imorrish\Documents\WindowsPowerShell\NReco.VideoConverter.dll'
$ffMpeg = new-object NReco.VideoConverter.FFMpegConverter
#Create thumnail
$ffMpeg.GetVideoThumbnail($video, $thumbnail,1653); #seconds from start
#Convert to MP4
$ffMpeg.ConvertMedia($video, "d:\capture\Conference_20170722_090251.mp4", [NReco.VideoConverter.Format]::mp4)

Sony BVS T-Bar reused

I picked up an old Sony BVS-3200 broadcast vision mixer from ebay (my first experience of the Global Shipping program and it actually works).

I’m still undecided whether I will be able to use the panel through the existing serial interface (need to get a frame to decode the messages), rip out the microprocessor and put in an Arduino (requires reverse engineering all the logic) or gut it for the parts to build my own panel.

Just testing the T-Bar as it is non-destructive to remove it for testing. Rather than using a potentiometer, Sony used a rotary encoder that outputs pulses (must be a technical name for this which I’ll find on Google eventually).

It actually outputs 2 signals so you can detect the direction by which line goes high first.

I get 536 counts from full movement of the T-Bar.

PowerShell and demo video showing this controlling the Blackmagic Design ATEM fader coming soon. In the mean time I’m also converting an old EchoLab MVS panel but that uses very simple circuit by the look of it so I’ll be replacing its Z80 processor with an Arduino.



Frustrated with Windows default audio device changing?

You can include PowerShell commands to change the default device (for playback and recording) using PowerShell

Using this GitHub project https://github.com/jtheller/AudioDeviceCmdlets/tree/ce0bd480e96e934621c5ca6f846a65830c1a74d3

I found this useful when using a DVI Extender that would change the default audio to itself even though it required the main sound card to provide the audio into it.

Just install using the script below

#region Install code, just run once
$location = ($profile | split-path)+ "\Modules\AudioDeviceCmdlets\AudioDeviceCmdlets.dll"
New-Item "$($profile | split-path)\Modules\AudioDeviceCmdlets" -Type directory -Force
(New-Object System.Net.WebClient).DownloadFile($url, $location)

#run this or add it to your profile so the module is always imported
Import-Module AudioDeviceCmdlets

#List current audio devices
Get-AudioDevice -List | select Index,Default,Type,Name| ft



ATEM SuperSource Box configuration using PowerShell script

I finally sorted the code for enumerating the collection of super source boxes in the 2 M/E and tested it this weekend.

Download the latest version here…

add-type -path 'C:\Users\imorrish\Source\Workspaces\VISE_ATEMLib\SwitcherLib\bin\Debug\SwitcherLib.dll'

add-type -path 'documents\windowspowershell\SwitcherLib.dll'
$Global:atem = New-Object SwitcherLib.Switcher("")
$Global:ME = $atem.GetMEs()
#Display current box values
$SSBoxes | ft
#Assign each box to object
#set options for Box1
$box1.PositionX = -4
$box1.PositionY = 6
$box1.Size = .25
$Box1.Enable = 1
#Put SuperSource on-air


PS C:\Users\imorrish> $SSBoxes | ft
Enabled InputSource PositionX PositionY Size Cropped CropTop CropBottom CropLeft CropRight
——- ———– ——— ——— —- ——- ——- ———- ——– ———
1       1           -8        4.5       0.25 0       0       0          0        0
1       2           8         4.5       0.5  0       0       0          0        0
1       3           -8        -4.5      0.5  0       0       0          0        0
1       4           8         -4.5      0.5  0       0       0          0        0

ATEM SuperSource Box Configuration UI

The software panel is a but cumbersome when it comes to making a lot of settings that involve size and position of effects.

I have provided a few examples of making adjustments to things like chroma key settings using a midi device but probably the ultimate in complexity is setting the super source parameters and option for the 2 M/E.

The following screenshot is more of a teaser as I don’t have a 2 M/E right now but will try and get a video of it working soon. I’ll also be publishing a new switcherlib for PowerShell that has a full implementation of the SuperSource Box configuration options.

Automating OBS from PowerShell Script

Open Broadcaster Software (OBS) is a great, open source, product that can be used to capture, record and stream a mixture of sources. With support for Decklink cards, it is easy to include the output of an ATEM vision mixer.

Using Windows PowerShell would let you automate OBS using XKeys or a Midi device and even coordinate switching ATEM inputs or playing out graphics from CasparCG at the same time (see my other PowerShell add-ons in https://ianmorrish.wordpress.com/v-ise/)

What you need:

Web Socket add-in for OBS https://obsproject.com/forum/resources/obs-websocket-remote-control-of-obs-studio-made-easy.466/download?version=1124

The following files in your Documents\WindowsPowerShell directory (remember to un-block them after downloading)

WebSocket-Sharp.dll https://1drv.ms/u/s!ApGpqMMpRLhijrNWU5eDhO1PzJZkAg

NewtonSoft.Json.dll https://1drv.ms/u/s!ApGpqMMpRLhijrNYgWt2nKGOqx2XGQ

OBS-WebSocket-Net.dll https://1drv.ms/u/s!ApGpqMMpRLhijrNXDV9u52u6CWbdbQ

Sample script

Add-Type -path ‘documents\WindowsPowerShell\obs-websocket-dotnet.dll’
$obs = new-object OBSWebsocketDotNet.OBSWebsocket
$obs.Connect(“ws://”, “password”)
$scenes = $obs.ListScenes()
#Loop through each scene
$loop = $true; $i =1

if($i -eq $scenes.Count){$i=1}
Start-Sleep 5
#Other commands

All methods and properties for OBS Websocket:

Panasonic PXW270 camera and AK-HRP200 CCU configuration

The last time I tried to get this combination of camera and Camera Control Unit (CCU/RCP) working it took almost a day of searching for the required configuration settings and firmware versions. After finally getting it to work I was sure I had documented it but when I had to do it again this week for a couple of new cameras and CCU unit I couldn’t find it anywhere and search for the answer did not return any decent results.

What you need:

Software from Panasonic, CCU firmware available after 2013.


This page also provides links to the following software:

Easy IP – this lets you discover the AK-HRP200 unit and change its IP if you want. The default is
Just a tip with the Panasonic software, only have one HRP200 plugged into the network (or direct to your PC) if you want to change its configuration.

Smart Configuration Tool (ROP Setup Software)

Set the CCU and Cameras to be on the same network. The camera IP address is set by holding down the Menu button on the camera for more than 5 seconds, otherwise you only get the simple user menu settings.

The camera must be configured to allow remote control. This is in the network setting and there are two settings required to make it work.



Set up a user name/password or use the default (guest p2guest)

Using the Smart Configuration Tool, you can tell the RCP about any cameras that it can control. The trick is to use the settings below:

Connection Mode: IP Mode

Camera Type: RemoteCamera


Camera Type: Camcorder IP

Camera Port No: 49152


Even if I have one CCU per camera, I always add the other cameras to each CCU just in case a CCU fails, you can hold down the Select button until the camera number flashes and then use the DATA SET up and down arrows to select another camera.