Tobias,

Thanks for your example. I've now got the Exec's termination working OK. 
Below is an extract from my code:
Private aExec As String[]
Private sOutput As String
Private hffmpeg As Process
hffmpeg = Exec aExec Wait For Input Output As "ffmpegMessages"
Public Sub ffmpegMessages_Read()
   Dim sLine As String
   Read #Last, sLine, -256
   sOutput &= sLine
End
Public Sub ffmpegMessages_Kill()
   Print "ffmpeg Output = "
   Print sOutput
End
Public Sub ButtonStop_Click()
   If hffmpeg.State = Process.Running Then Print #hffmpeg, "q"

At run time:
1. aExec was equal to ["ffmpeg", "-f x11grab",.....]. Thus, the first 
parameter was "-f x11grab") which was displayed by ffmpeg as 
unrecognised (even though running "ffmpeg -f x11grab ......." is OK.
The setting of the value in aExec was done by:
aExec = ["ffmpeg"]
aExec.Add("-f x11grab")
etc
I think that I've seen something like this before with Exec but I don't 
remember the reason or solution. Any ideas?

2. The Kill routine above was executed. At run time, there was an error 
caused by the last line being:
If hffmpeg and hffmpeg.State = Process.Running Then Print #hffmpeg, "q"
So I removed the first hffmpeg & it was OK at runtime.

3. I wanted to incorporate:
Public Sub ffmpegMessages_Error(sError)
   Print "ffmpeg Error = "
   Print sError
End
but the compiler objected. Any ideas?

-- 
Regards, John

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