getting last STDERR output if the .exe closes

[fatpig]

Hey guys,

I have been working on an automation app for ffmpeg.exe recently.

It all works nicely, ffmpeg.exe is a command line tool to encode video files.

while it is working, it gives me the current position of the encode in the format 00:01:02:77 (hours, minutes, seconds, percent of a second)

I also have the duration of the video.

this is used to calculate the percentage already encoded.

trouble is, even if i let it run without any "sleep", it never catches the last message which would display the total time of the video as the current position, which would be 100%, it gets worse the shorter the video is.

My question is, is there any option to get the "exit" message of a window, so to say, the absolute last stderr read?

I need this so it is not confusing and so I can know if the ffmpeg.exe terminated somewhere in between.

thoughts? Thanks!

[Jos]

Can you show the code section you use to capture the STDOUT/STDERR to see if that is correct?

Jos

[fatpig]

Oh, of course.

It may be a bit confusing, I am still learning

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$runbefehl = """" & @scriptdir & "ffmpeg.exe" & """" & " -i " & """" & $sourcearray2[$i] & """" &  " -y -target " & $system & "-dvd -b:v " & $bitrate & "k -aspect " & $aspect& " " & """" & $destination & "output" & $i & ".mpg" & """"
;~    InputBox("","",$runbefehl)
     $process = run($runbefehl, @ScriptDir, @SW_HIDE, $STDERR_CHILD)
     WinWait(@scriptdir & "ffmpeg.exe")
     $counterprogress = 0
sleep(100)
;~ while 1
        $line = StderrRead($process) ;stderr lesen
;~       if @error Then      ExitLoop
;~       WEnd
;~ InputBox("","",$line)
     ;~ =============================================================progress auslesen
     While WinExists(@scriptdir & "ffmpeg.exe")
        $lineshort = StringRight($line, 200)
     ;~ inputbox("","",$line) ; DEBUG LINE
     ;~   MsgBox(64,"",$curtime)
     sleep(10)
     If GUICtrlRead($Cancel) = 1 Then
      ProcessClose($process)
      EndIf
       If $lineshort = "" Then
       Else
       Do
        $curtime = StringRight($lineshort, $counterprogress) ; hier progress auslesen
        $counterprogress = $counterprogress + 1
       Until Stringinstr($curtime, "time=")
       $counterprogress = 0
       $curtime = StringTrimLeft($curtime, 5)
       Do
        $curtime = StringTrimRight($curtime, 1)
       until StringInStr($curtime, " ") = 0
;~      GUICtrlSetData($statusbox, "begin transcoding… (step 1 of 2)" & @crlf & $curtime & " of " & $duration)

       $HourCur = Stringleft($curtime, 2)
       ;~ msgbox(64,"",$curtime)
       $MinCur = StringTrimLeft(StringLeft($curtime, 5),3)
       $SecCur = StringTrimLeft(StringLeft($curtime, 8),6)
       ;~ ===============================================================times to ticks
       Local $TotalTicks = $runtimearray[$i]
       Local $CurrentTicks = _TimeToTicks($HourCur, $MinCur, $SecCur) ; current time to ticks
       ;~ ===============================================================calulate percentage
       $percent = Round($CurrentTicks / ($TotalTicks / 100), 0)
       ;~ msgbox(64,"",$percent)
       GUICtrlSetData($progress, $percent)
       GUICtrlSetData($percentagelabel, $percent & Chr(37))
        ;~ ===============================================================
       ;~  END CALCULATING PERCENTAGE
        ;~ ===============================================================

     EndIf

[Jos]

2 questions about your code:

1. Where do you read the STDERR inside the While-Wend loop as I do not see it in the code?

2. You loop base on WinExists() with the program... why ? Think that loop should continue until StderrRead() returns an @error to ensure you capture all output.

[fatpig]

Hello, I think you got the gist of the problem there.

I do not fully understand how to do it the best way.

it did it by winexists() because I did not fully understand the construction between stderrread and the while loop.

currently I am doing it by winexists, and every loop it reads stderr by

$line = StderrRead($process)

are you saying, that a while 1 loop with an @error exit line like you said,

would be equal to a winexists() function, but more accurate?

[Jos]

Correct, I would expect the script to look something like:

While 1
   ; add latest STDERR to $line
   $line &= StderrRead($process) ;stderr lesen
   if @error Then ExitLoop  ; Exit when STDERR fails which mean that the process doesn't exist anymore
   $lineshort = StringRight($line, 200)
; ... rest of your while loop

Edited October 28, 2012 by Jos

[fatpig]

Thank you very much. Great help! I will try that!