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• ffmpeg writing the output of the command to a text file doesn't work with C#

  5 février 2021, par Lifshitz

  I am using ffmpeg commands with C# processes. I used a command to change the audio of a video and it was working but I also wanted to write the output to a text file. The new command works from cmd but apparently, it does not work while using a C# process.
The command that does not work with the Process is :

  


  ffmpeg -i videoPath -i audioPath -c:v copy -map 0:v:0 -map 1:a:0 -shortest newVideoPath > textFilePath 2>&1


  


  And the working command is the same without the last part :

  


  ffmpeg -i videoPath -i audioPath -c:v copy -map 0:v:0 -map 1:a:0 -shortest newVideoPath


  


  Here is the C# code :

  


   Process proc = new Process();
 proc.StartInfo.FileName = ffmpegPath;
 proc.StartInfo.RedirectStandardError = true;
 proc.StartInfo.RedirectStandardOutput = true;
 proc.StartInfo.UseShellExecute = false;
 proc.StartInfo.CreateNoWindow = true;
 proc.StartInfo.Arguments = "-i " + videoPath + " -i " + newAudioPath + " -c:v copy" + " -map" + " 0:v:0 " + "-map 1:a:0 " + "-shortest " + newVideoPath + " > " + @"F:\Videos\log.txt"+ " 2>&1";
 proc.EnableRaisingEvents = true;
 proc.Exited += UpdateVideoSource;
 proc.Start();


  


  I checked the arguments over and over again, and looked for missing spaces but nothing worked.
What can be the problem ?

  


• avfilter/vf_fps : Work around msvc (c99wrap) build failure

  26 août 2013, par Pavel Koshevoy

  avfilter/vf_fps : Work around msvc (c99wrap) build failure
  c99wrap choked on initialization of .dbl start_time option with
  
  AV_NOPTS_VALUE : Unable to parse int64_t as expression primary
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavfilter/vf_fps.c

• Video Processing in background with work manager using ffmpeg

  24 novembre 2020, par Naseer Attari

  The problem comes when during the video processing user closes the application himself from the task manager then its processing stops.

  


  I am working on video file processing in android using FFMpeg, which is working perfectly but when I do close the application during processing from task manager then video processing has stopped working even I added all the work in work manager.

  


      @Override 
public Result doWork() {
        shellCommand = new ShellCommand();
        ffmpegBinary = new String[] {
            FileUtils.getFFmpeg(context).getAbsolutePath()
        };
        command = concatenate(ffmpegBinary, command);
        CommandResult commandResult = getCommandResult(command);
        if (command`enter code here`Result.success) {
            onSuccess(videoPath);
        } else {
            onFailure(videoPath);
        }
    }
    //getCommandResult
    private CommandResult getCommandResult(String[] command) {
        try {
            process = shellCommand.run(command, null);
    
            if (process == null) {
                return CommandResult.getDummyFailureResponse();
            }
            checkAndUpdateProcess();
            return CommandResult.getOutputFromProcess(process);
        } catch(Exception e) {} finally {
            Util.destroyProcess(process);
        }
        return CommandResult.getDummyFailureResponse();
    }


  


  As far as I can tell, when the application closes from the background then the parent process destroys it and is destroying all of its sub-process too, FFMpeg is using the android process to execute the command and check the video file status during video processing.

  


  Looking forward to hear from you.
Thanks