How to get the unique Process ID from a 3rd party exe - vb.net

Question

Ive created a screen recorder and stream recorder that can run at the same time. I'm using FFMPEG to perform the recordings which are triggered using the Process.Start() function. Now if both recording options are running, I have 2 FFMPEG programs running and 2 Console windows running. So, I need to be able to close or exit either recording options independently without it effecting the other.
So far this is my code...
Dim cmdstr = "/k ffmpeg.exe -y -probesize 10M -rtbufsize 1500M -f dshow -i audio=""" &
Audio_name & """ -acodec pcm_s16le -f gdigrab -framerate 60 -i desktop -vcodec libx264 -qp 0
-threads 0 -crf 18 -preset ultrafast -tune zerolatency " & str & "\Recordings\ScreenRecorder"
& FileTime & ".mkv"
If TestFF = True Then
MsgBox("1. Test Mode: " & cmdstr)
Process.Start("cmd.exe", "/k ffmpeg.exe -list_devices true -f dshow -i dummy") ' This lists all devices
Process.Start("cmd.exe", cmdstr)
RTBStreamData1.Text = cmdstr
RecordingInProcess = True
RecordingOn = True
Else
Dim startInfo As New ProcessStartInfo("cmd.exe")
startInfo.Arguments = cmdstr
startInfo.WindowStyle = ProcessWindowStyle.Hidden
startInfo.CreateNoWindow = True
startInfo.UseShellExecute = False
Process.Start(startInfo)
RecordingInProcess = True
RecordingOn = True
Dim ProcID As Integer = Process.GetCurrentProcess.Id
Label13.Text = ProcID.ToString
I am able to get the ID of the application itself, but it is the individual processes of ffmpeg and the associated console window that I need to be able to close at the same time.
any form of help would be really appreciated. Thank you.
In the image above you can see that i was able to track the first process, but not the second!!!

Answer 1

If I well understood: A trick you can use might be you pass a “FAKE” custom argument to each process you’re going to start by Process.Start(). After that looping running processes you can recognize your target process.
The code below gives an idea. (There is to change something in the SQL String in order to avoid SQL injection)
Dim PROCESS_CUSTOM_ARG As String = "UNIQUE_STRING_ID_HERE" '& _1 also add an integer incremental for each process
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim startInfo As New ProcessStartInfo("cmd.exe")
startInfo.Arguments = " - a lot of your Arguments here"
startInfo.Arguments &= " - " & PROCESS_CUSTOM_ARG
startInfo.WindowStyle = ProcessWindowStyle.Hidden
startInfo.CreateNoWindow = True
startInfo.UseShellExecute = False
Process.Start(startInfo)
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim searcher As New System.Management.ManagementObjectSearcher("root\CIMV2", "SELECT ProcessId, CommandLine FROM Win32_Process WHERE CommandLine LIKE '%" & PROCESS_CUSTOM_ARG & "' ")
For Each p As System.Management.ManagementObject In searcher.Get()
Dim ProcessId As String = p("ProcessId")
Dim CommandLine As String = p("CommandLine")
Console.WriteLine($"CommandLine: {CommandLine} ProcessId: {ProcessId}")
Dim Proc As Process = Process.GetProcessById(ProcessId)
Proc.Kill()
Next
End Sub