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• avcodec/atrac9dec : Check conditions before apply_band_extension() to avoid out of...

  15 juin 2019, par Michael Niedermayer

  avcodec/atrac9dec : Check conditions before apply_band_extension() to avoid out of array read in initialization of unused variables
  Fixes : global-buffer-overflow
  
  Fixes : 15247/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC9_fuzzer-5671602181636096
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/atrac9dec.c

• Different results for exit conditions in process call

  31 août 2017, par Martin KS

  As a small part of a project, I’m calling ffmpeg to convert a video - I worked from an old example that used some of the output to create a progress bar, which was hanging. Code below :

  [initiation code common to both examples]
  
      Dim inputFile, outputFile As String, myProcess As New Process
  
      Dim psiProcInfo As New ProcessStartInfo, ffreader As StreamReader
  
  
  
  
  
      inputFile = "C:\Users\mklefass\Downloads\Video 2017-08-16 21.01.39.mov"
  
      outputFile = "C:\Users\mklefass\Downloads\tmp2\Output"
  
  
  
      psiProcInfo.FileName = Application.StartupPath + "\ffmpeg.exe"  'Location Of FFMPEG.EXE
  
      psiProcInfo.Arguments = " -i " & Chr(34) & inputFile & Chr(34) & " -vf fps=5 " & Chr(34) & outputFile & "%d.jpg" & Chr(34)                              'start ffmpeg with command strFFCMD string
  
      psiProcInfo.UseShellExecute = False                             'use the shell execute command we always want no
  
      psiProcInfo.WindowStyle = ProcessWindowStyle.Hidden             'hide the ffmpeg process window
  
      psiProcInfo.RedirectStandardError = True                        'Redirect the error out so we can read it
  
      psiProcInfo.RedirectStandardOutput = True                       'Redirect the standard out so we can read it
  
      psiProcInfo.CreateNoWindow = True
  
  
  
  [bit that changes]
  
  myProcess.Start()
  
  ffreader = myProcess.StandardError
  
  Do
  
      Try
  
          If Not myProcess.HasExited Then
  
              'Debug.WriteLine(ffreader.ReadLine)
  
          End If
  
      Catch
  
          If Not myProcess.HasExited Then
  
              MsgBox("Something went wrong")
  
          End If
  
      End Try
  
  Loop Until myProcess.HasExited
  
  MsgBox("done")

  I then found another example that just called the executable and then continued when it was done - as below :

  [same initialisation]
  
  Debug.WriteLine("Starting...")
  
  myProcess.Start()
  
  strOutput = myProcess.StandardError.ReadToEnd
  
  myProcess.WaitForExit()
  
  myProcess.Close()
  
  
  
  Debug.Write(strOutput)
  
  MsgBox("done")

  The second approach worked perfectly... What’s different about the "exit state" that Process.HasExited and Process.WaitForExit look for ?

• FFMPEG- force abortion on certain conditions

  18 juin 2023, par POL

  FFMPEG shows various errors, once in a while, during which the video is stuck or choppy. I couldn't find a way to fix it, but I figured that if I start the process again, it gets fixed.
The errors are like :
timestamp discontinuity for stream
New video stream with index 6

  


  This is what I run :

  


  ffmpeg -xerror -abort_on empty_output_stream+empty_output -fflags +discardcorrupt -http_persistent false -i URL -c:v libx264 -c:a aac -preset superfast -copyts -f mpegts udp://localhost:1937?pkt_size=1316


  


  How can I force FFMPEG to abort ?