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• C# Batch File Not Running Correctly

  19 juin 2013, par Scott Stevens

  i am trying to run an ffmpeg command using c# and CMD.

  I am creating and then executing a .bat file to do this. The .bat seems to create correctly, but when executed within c# it does not run correctly - It cannot find the image names. However when i exit the debugger and run the .bat the debugger created manually it works fine.

  The images have just been created by the debugger, could this have something to do with it ?

   string command1=  "ffmpeg -r 1/5 -i " + projectPrefix + "image-%%02d.bmp -i music.mp3 -qscale:v 2 -shortest -codec:a copy " + projectPrefix + "output.flv \n ffmpeg -i "+projectPrefix+"output.flv -vcodec wmv1 -acodec adpcm_ima_wav " + projectPrefix + ".wmv";
  
  
  
        // Write the string to a file.
  
       System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Scott\desktop\"+projectPrefix+".bat");
  
       file.WriteLine(command1);
  
  
  
       file.Close();
  
       Thread.Sleep(10000);
  
  
  
       System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo(@"C:\Users\Scott\desktop\" + projectPrefix + ".bat");
  
       psi.RedirectStandardOutput = true;
  
       psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
  
       psi.UseShellExecute = false;
  
       System.Diagnostics.Process listFiles;
  
       listFiles = System.Diagnostics.Process.Start(psi);
  
       System.IO.StreamReader myOutput = listFiles.StandardOutput;
  
       listFiles.WaitForExit(2000);
  
       if (listFiles.HasExited)
  
       {
  
           string output = myOutput.ReadToEnd();
  
  
  
       }

  Thanks

• How to solve file path error while using ffprobe to find length of video file in python ?

  4 février 2018, par Mitchell Faas

  So, I’m trying to find the length of a video file by the methods discussed here : How to get the duration of a video in Python ?, Using ffmpeg to obtain video durations in python. But in doing so I run in to a problem which I haven’t been able to solve : I get

  FileNotFoundError:[WinError 2] The system cannot find the file specified

  after trying a bunch of troubleshooting steps I’ve started running in IPython and in cmd seperately to see where things might break down. Using a stripped down version of this code in IPython gives me

  In [11]: subprocess.Popen([ffmpeg_path+'ffprobe'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  Out[11]: 

  which seems to be fine, as is CMD at this point. So to adding slight complexity :

  In [17]: subprocess.Popen([ffmpeg_path+'ffprobe -i "F:/tst.mp4"'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  ---------------------------------------------------------------------------
  
  FileNotFoundError                         Traceback (most recent call last)
  
   in <module>()
  
  ----> 1 subprocess.Popen([ffmpeg_path+'ffprobe -i "F:/tst.mp4"'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  
  
  C:\Python\Anaconda3\lib\subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors)
  
      705                                 c2pread, c2pwrite,
  
      706                                 errread, errwrite,
  
  --> 707                                 restore_signals, start_new_session)
  
      708         except:
  
      709             # Cleanup if the child failed starting.
  
  
  
  C:\Python\Anaconda3\lib\subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_start_new_session)
  
      988                                          env,
  
      989                                          cwd,
  
  --> 990                                          startupinfo)
  
      991             finally:
  
      992                 # Child is launched. Close the parent's copy of those pipe
  
  
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  </module>

  This crashes IPython. Running the very same command ffprobe -i "F:/tst.mp4" in CMD works like a charm.

  Here’s what I tried : Changing / to \ and \ , adding and removing quotes around the file path, changing the path to C :\tst.mp4.

  Running the command os.system(ffmpeg_path+'ffprobe -i "F:/tst.mp4") does work.

  What could possibly be going wrong here ?

• Convert images to a video file while keeping the same file name ? [duplicate]

  15 juillet 2015, par Ertzi

  This question already has an answer here :

  • execute ffmpeg command in a loop
    
    2 answers
    

  My intention would be to get at the same time, picture1.jpg, picture2.jpg, picture3.jpg to video format such as picture1.mp4, picture2.mp4, picture3.mp4.

  I am currently using Mencoder and Linux bash code mencoder mf: //*.jpg -mf w = 1366: h = 768: fps = 6/60: type = jpg -ovc copy -oac copy -o images.mp4. But this command makes all the images into one video file (images.mp4).

  Can I do it with mencoder or ffmpeg ?
  My linux bash coding skills are basic.

  ---

  I found a solution that works for me as I want. Thank you to all who helped me.

  # ! /bin/bash
  for input in *.jpg
  do
  mencoder -ovc copy -mf w=1366:h=768:fps=1/11:type=jpg -ofps 30000/1001 mf ://"$input" -o $(echo $input | sed -e ’s/.jpg$/.mp4/’)
  done