[Gambas-user] ffmpeg locking up Shell

[T Lee Davidson]

On 9/21/21 4:46 AM, Bruce Steers wrote:
> 
> I'm trying to use ffmpeg to get the time length of a music file.
> 
> I'm doing it like this..
> 
> *  Shell "ffmpeg -i '" & sSoundFile & "' 2>&1|grep Duration|awk '{print $2}'" Wait To sVar*
> 
> the command works fine in a terminal but my gambas app freezes on trying to run it?
> I know the command outputs to error not stdout so have to use the 2>&1 divert
> 
> Anyone know what the problem is?
> It's like the ffmpeg command never exits
> 
> Cheers all
> BruceS
> 

Apparently ffmpeg is one of those programs that have a command-line interface that is accessible only if running inside a 
virtual terminal.

Try:
Public Sub Main()

   Shell "ffmpeg -i '" & sSoundFile & "' 2>&1|grep Duration|awk '{print $2}'" Wait For Input As "Process"

End

Public Sub Process_Read()

   Dim sLine As String

   sLine = Read #Last, -256
   Print sLine

End


BTW, the Wait keyword is not required when using the quick (ie. "To sVar") syntax.


-- 
Lee