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• C# FFMPEG : Code bugs out and stops producing media files

  24 mai 2020, par Hamez

  I've made a joke program in C# that uses ffmpeg to edit videos with different effects such as stuttering. I've finished 3 effects so far and each of them work on their own but as soon as I put one after another e.g.  fx.CrashStutter(0, 2); fx.CrashBeep(2, 2); fx.Wow(4, 2);
The code breaks and no longer produces photo/video files but once I stop debugging the file it was supposed to be processing appears. I've used a system where it loops over trying to execute a command to create a text file as a marker for when ffmpeg is done processing a file. The debug console also repeatedly says "The process tried to write to a nonexistent pipe."

  



  Here's the code for all 3 effects :

  



   public void Wow(double start, double duration)
        {
            if (fxstart == true)
            {
                //MessageBox.Show("WowFX Duration" + duration);
                string folderName = ("W_s" + start);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("mkdir " + folderName);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("cd " + folderName);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("ffmpeg -ss " + start + " -t " + (duration / 6) + " -i " + source + " a.mp4");
                //wait until a.mp4 appears
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\a.txt") == false)
                {
                    /*aha got a live one!*/FXcmd.StandardInput.WriteLine(" echo a > a.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -i a.mp4 -vf reverse -af areverse b.mp4");
                //wait until b.mp4 appears
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\b.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo b > b.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -ss " + start + " -t " + (duration / 3) + " -i " + source + " c.mp4");
                //wait until c.mp4 appears
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\c.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo c > c.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -i c.mp4 -vf reverse -af areverse d.mp4");
                //wait until d.mp4 appears
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\d.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo d > d.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                string[] concatList = { "file 'a.mp4'", "file 'b.mp4'", "file 'c.mp4'", "file 'd.mp4'" };
                //FXcmd.StandardInput.Write("del a.txt, b.txt, c.txt, d.txt");
                //System.Threading.Thread.Sleep(1000);
                System.IO.File.WriteAllLines(("FxSource(Temporary)\\" + folderName + "\\concatList.txt"), concatList);
                System.Threading.Thread.Sleep(1500);
                FXcmd.StandardInput.WriteLine("ffmpeg -f concat -i concatList.txt -c copy " + folderName + ".mp4");
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\" + "1.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo 1 > 1.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("copy " + folderName + ".mp4 ..");
                while (File.Exists("FxSource(Temporary)\\" + folderName + ".mp4") == false)
                {
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("cd ..");
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("cls");
                FXcmd.StandardInput.Flush();
            }
        }
        public void CrashStutter(int start, int duration)
        {
            if (fxstart == true)
            {
                string folderName = ("Cs_s" + start);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("mkdir " + folderName);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("cd " + folderName);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("ffmpeg -ss " + start + " -t 0.1" + " -i " + source + " a.mp4");
                System.Threading.Thread.Sleep(100);
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\a.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo a > a.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -stream_loop "+10*duration+" -i a.mp4 "+folderName+".mp4");
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\" + "1.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo 1 > 1.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("copy " + folderName + ".mp4 ..");
                while (File.Exists("FxSource(Temporary)\\" + folderName + ".mp4") == false)
                {
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("cd ..");
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("cls");
                FXcmd.StandardInput.Flush();
            }
        }
        public void CrashBeep(int start, int duration)
        {
            //this effect cannot last longer than 7 seconds
            double contrast = 25;
            double red = 0.75;
            if (fxstart == true)
            {
                string folderName = ("Cb_s" + start);
                FXcmd.StandardInput.WriteLine("mkdir " + folderName);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("cd " + folderName);
                System.Threading.Thread.Sleep(100);
                /*gets stuck*/FXcmd.StandardInput.WriteLine("ffmpeg -i "+source+ " -vf fps=1 a.jpg");
                System.Threading.Thread.Sleep(100);
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\a.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo a > a.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -i a.jpg -vf eq=contrast="+contrast+" b.jpg");
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\b.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo b > b.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -i b.jpg -vf colorbalance=rm=" + red + " c.jpg");
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\c.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo > c.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -loop 1 -i c.jpg -c:v libx264 -t "+ duration +" -pix_fmt yuv420p -vf scale=1920:1080 d.mp4");
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\d.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo d > d.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("cd ..");
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("copy beep.mp3 "+folderName+"/beep.mp3");
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("cd "+folderName);
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("ffmpeg -i beep.mp3 -ss 0 -t " + duration + " e.mp3");
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\e.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo e > e.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("ffmpeg -i d.mp4 -i e.mp3 -c copy -map 0:v:0 -map 1:a:0 " + folderName + ".mp4");
                while (File.Exists("FxSource(Temporary)\\" + folderName + "\\" + "1.txt") == false)
                {
                    FXcmd.StandardInput.WriteLine(" echo 1 > 1.txt");
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("copy " + folderName + ".mp4 ..");
                while (File.Exists("FxSource(Temporary)\\" + folderName + ".mp4") == false)
                {
                    System.Threading.Thread.Sleep(1500);
                }
                FXcmd.StandardInput.WriteLine("cd ..");
                System.Threading.Thread.Sleep(100);
                FXcmd.StandardInput.WriteLine("cls");
                FXcmd.StandardInput.Flush();
            }
        }


  



  Any suggestions ? Thanks !

  


• Cannot use FFmpeg in Xcode iOS Project (file .h not found)

  19 mars 2016, par BlackBox

  I followed almost step by step this guide.

  Almost because I downloaded, as a user suggested, ffmpeg ios library already built from here

  I followed from "Linking static libraries in Xcode" but I cannot import anyway the header files of ffmpeg. (So I got the .a files)

  For example

  #include "avformat.h"
  
  // or
  
  #import "libavformat/avformat.h"
  
  // or
  
  #import <libavformat></libavformat>avformat.h>

  Everything that I use does not work.

  I specify that those .a files are currently in my project directory, indeed, if I import the .a file, it doesn’t complain that it isn’t found, but when compiling, it complains about UTF-8 stuff because .a files are object libraries and cannot be imported that way.

  I put also the Header Search Paths for the project as it was suggested and the config.log file but nothing.

  Also I see libraries are missing from every project example of FFmpeg I was able to find on GitHub.

  Any ideas ?

• Run avconv in python and direct stdout/stderr to a file

  19 février 2016, par tdk

  I wish to run Avconv commands and record the logs in a file. In the Ubuntu terminal this can be accomplished using &>> operator after the actual command enclosed in parenthesis i.e.

  (avconv -i SRCFILE -ss 00:15:00 -t 00:30:00 TARGETFILE -threads auto) &>> LOGFILE

  The above command works perfectly when run in the terminal.

  Now I have a number of such commands to run, and thought running them through Python would be good.

  1. I tried using the os.system(command_string) way
     , which when run does not pack the Avconv output to the LOGFILE, and the avconv command seems to execute after the Python script is done - evidenced by some string outputs I put in for debugging. I’m also getting some permission errors. Here is how the first portion of output looks like

     AVCONV COMMAND EXECUTED
     
     sh: 1: : Permission denied
     
     sh: 1: : Permission denied
     
     sh: 1: 
     
     
     
     
     
     PROGRAM DONE
     
     : Permission denied
     
     $ avconv version 11.2-6:11.2-1, Copyright (c) 2000-2014 the Libav developers
     
       built on Jan 18 2015 05:12:33 with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu2)
     
     Trailing options were found on the commandline.
     
     Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ...

  2. I also tried using the subprocess.call() method for which I get the following error (NOTE : all files exist)

     Traceback (most recent call last):
     
       File "/home/usr/cnv.py", line 61, in <module>
     
         main()
     
       File "/home/usr/cnv.py", line 46, in main
     
         subprocess.call(newcmd)
     
       File "/usr/lib/python2.7/subprocess.py", line 522, in call
     
         return Popen(*popenargs, **kwargs).wait()
     
       File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
     
         errread, errwrite)
     
       File "/usr/lib/python2.7/subprocess.py", line 1335, in _execute_child
     
         raise child_exception
     
     OSError: [Errno 2] No such file or directory
     
     </module>

  I wish to run multiple (think 50+) commands of Avconv similar to the version shown at the top, and have the logs saved in a file instead of in stdout. How do I do this - in Python or otherwise ?