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• C# Process in loop reading error output, causes "No async read operation is in progress on the stream" error

  29 mai 2023, par TSLee

  I am trying to read the format of multiple video files using ffmpeg in an asynchronous operation of Process and facing an error, "No async read operation is in progress on the stream". According to https://social.msdn.microsoft.com/Forums/vstudio/en-US/c961f461-7afb-4a92-b0ae-f78c2003b5de/help-an-asynchronous-read-operation-is-already-in-progress-on-the-standardoutput-stream?forum=csharpgeneral, I think I have to use CancelErrorRead(), as BeginErrorReadLine() can't be launched more than once. I also wonder if I use this function in the wrong place, because the read operation has ended in process1.exited() ? But the operation can't proceed to the second index with this error.

  


  How could I use CancelErrorRead()/CancelOutputRead() properly and where should I place them on the code ? I also did an experiment in that I commented these two CancelRead(), and a different error "async read operation has been started on the stream" will appear.

  


              Process process1 = new Process();
            process1.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            process1.StartInfo.CreateNoWindow = true;
            process1.StartInfo.UseShellExecute = false;
            process1.StartInfo.FileName = ".\\ffmpeg.exe";
            process1.StartInfo.WorkingDirectory = ".\\";
            process1.EnableRaisingEvents = true;
            process1.StartInfo.RedirectStandardOutput = true; //if this is true, UseShellExecute must be false. true if output should be written to StandardOutput
            process1.StartInfo.RedirectStandardError = true;
            //indicates that the associated Process has written a line that's terminated with a newline
            process1.ErrorDataReceived += new DataReceivedEventHandler(inputHandler);
            process1.Exited += (ending, p) =>
            {
                flag = true;
                process1.CancelOutputRead();
                process1.CancelErrorRead();//
            };
            foreach (String file in inputList)
            {
                if (flag == true)
                {
                    flag = false;
                    process1.StartInfo.Arguments = "-i " + " \"" + file + "\"";
                    Console.WriteLine(process1.StartInfo.Arguments);
                    process1.Start();
                    process1.BeginOutputReadLine();//
                    process1.BeginErrorReadLine();
                    process1.WaitForExit(); //for asynchronous output
                }


            }
        }
        private void inputHandler(object sender, DataReceivedEventArgs l)
        {
             cba.Append(l.Data + "\n");
             videoInput = l.Data;
             //Console.WriteLine(cba);
             //Process p = sender as Process;
             Console.WriteLine(videoInput);

             this.BeginInvoke(new MethodInvoker(() =>
             {

              if (!String.IsNullOrEmpty(videoInput))
              {
                    if (videoInput.Contains("Stream #0:0"))
                    {
                        String subvideoInput1 = 
                        videoInput.Substring(videoInput.IndexOf("Stream #0:0"));
                        String video_inputType = subvideoInput1;
                        textBox1.Text += video_inputType + System.Environment.NewLine;
                        Console.WriteLine(video_inputType);
                     }
                     if (videoInput.Contains("Stream #0:1"))
                     {
                         String subvideoInput2 = 
                         videoInput.Substring(videoInput.IndexOf("Stream #0:1"));
                         Console.WriteLine(subvideoInput2.IndexOf("\n"));
                         Console.WriteLine(subvideoInput2);
                         String audio_inputType = subvideoInput2;
                         textBox1.AppendText(audio_inputType + System.Environment.NewLine);
                         Console.WriteLine(audio_inputType);
                     }
                     if (videoInput.Contains("Duration:"))
                     {
                         String videoinputDuration = 
                         videoInput.Substring(videoInput.IndexOf("Duration:"));
                         String subvideo_inputDuration = videoinputDuration.Substring(9);
                         String inputvideoDuration = 
                     subvideo_inputDuration.Remove(subvideo_inputDuration.IndexOf("."));
                         Console.WriteLine(inputvideoDuration);
                         double totalseconds = 
                         TimeSpan.Parse(inputvideoDuration).TotalSeconds;
                    
                    

                }
            }

        }));


    }


  


• Index error with MoviePy and OSError : MoviePy error : failed to read the duration of file

  24 août 2022, par Alejandro

  I made a small script to concatenate some clips. The names of the clips are stored in another text file that is read from.

  


  I get the error first that

  


  in ffmpeg_parse_infos
line = [l for l in lines if keyword in l][index]
IndexError: list index out of range


  


  then during that exception above, another occurs below

  


  Traceback (most recent call last):&#xA;  File "e:\Projects\TwitchMontage\VideoCompilation\src\create_video.py", line 32, in <module>&#xA;    clips = create_clips_from_list(list)&#xA;  File "e:\Projects\TwitchMontage\VideoCompilation\src\create_video.py", line 20, in create_clips_from_list&#xA;    clip = VideoFileClip(str(video_file_path))&#xA;  File "C:\Users\Alejandro\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\VideoFileClip.py", line 88, in __init__&#xA;    self.reader = FFMPEG_VideoReader(filename, pix_fmt=pix_fmt,&#xA;  File "C:\Users\Alejandro\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\ffmpeg_reader.py", line 35, in __init__&#xA;    infos = ffmpeg_parse_infos(filename, print_infos, check_duration,&#xA;  File "C:\Users\Alejandro\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\ffmpeg_reader.py", line 289, in ffmpeg_parse_infos&#xA;    raise IOError(("MoviePy error: failed to read the duration of file %s.\n"&#xA;OSError: MoviePy error: failed to read the duration of file E:\Projects\TwitchMontage\VideoCompilation\VideoFiles\raw_clips\clip0.mp4&#xA;</module>

  


  I suspect something is wrong with FFMPEG but I have no idea what to change to fix this. Is there any manipulation I can make to FFMPEG or the videos themselves to make them work with moviepy ?

  


  Code is below :

  


  import os
from moviepy.editor import VideoFileClip, concatenate_videoclips

PATH_TO_VALID_CLIPS = 'VideoCompilation/ClipData/valid_clips.txt'
PATH_TO_RAW_CLIPS = 'E:\Projects\TwitchMontage\VideoCompilation\VideoFiles\\raw_clips'
os.environ['IMAGEIO_FFMPEG_EXE'] = 'ffmpeg'

def read_valid_clips_list():
    #read valid clips
    file = open(PATH_TO_VALID_CLIPS, 'r')
    list = file.readlines()
    return list

def create_clips_from_list(list):
    clips = []
    for i, filename in enumerate(list):
        print(str(i) + '\n')
        video_file_path = os.path.abspath(os.path.join(PATH_TO_RAW_CLIPS, filename))
        print(video_file_path + '\n')
        clip = VideoFileClip(str(video_file_path))
        clips.append(clip)

    return clips

def create_draft(clips):
    draft = concatenate_videoclips(clips)
    draft.write_videofile("VideoCompilation/VideoFiles/videos/draft.mp4")
    return draft

list = read_valid_clips_list()
clips = create_clips_from_list(list)
draft = create_draft(clips)


  


  EDIT :

  


  I discovered something strange. When I manually create the combined video, there are no errors but the video created is corrupted and unplayable.

  


  

  


• ERROR in ./node_modules/fluent-ffmpeg/index.js Module not found : Error : Can't resolve './lib-cov/fluent-ffmpeg'

  3 octobre 2023, par yasgur99

  When I do yarn add fluent-ffmpeg i get this issue :

  



  WARNING in ./node_modules/electron-debug/index.js 96:45-58
Critical dependency: the request of a dependency is an expression
 @ dll renderer

WARNING in ./node_modules/electron-debug/index.js 97:61-74
Critical dependency: the request of a dependency is an expression
 @ dll renderer

WARNING in ./node_modules/fluent-ffmpeg/lib/options/misc.js 27:21-40
Critical dependency: the request of a dependency is an expression
 @ ./node_modules/fluent-ffmpeg/lib/fluent-ffmpeg.js
 @ ./node_modules/fluent-ffmpeg/index.js
 @ dll renderer

ERROR in ./node_modules/fluent-ffmpeg/index.js
Module not found: Error: Can't resolve './lib-cov/fluent-ffmpeg' in '/Users/yasgur99/Documents/desktopapp/node_modules/fluent-ffmpeg'
 @ ./node_modules/fluent-ffmpeg/index.js 1:48-82
 @ dll renderer


  



  They said they fixed it in this GitIssue : here

  



  Anyone have any advice ?

  



  Some notes : Im using babel, I'm building an electron application