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• ffmpeg crash when updating overlay file (c# console app)

  24 décembre 2024, par Vlad Stefan

  I am trying to develop a console app that can record the screen and have cpu/ram/gpu usage of the machine noted on the recording. The problem i am facing is that after a while (2-3 hours) the recording stops because ffmpeg is trying to read the file text while my C# code tries to update the file. I managed to find out that I should use a temp file and replace the original instead of rewriting the whole file but that way I encounter another problem, ffmpeg will try to read the file while the file is replaced or even for that split second when is considered deleted. Any ideas what I should do ? How should the method with the temp file be managed or how can I make the method that updates the same file stable ? I was even thinking to increment the ffmpeg reload frames since it might narrow the chances of crashing but it's not a 100% crash proof solution.

  


  Error message received from ffmpeg with updating only the text from the file :

  


  Error: [Parsed_drawtext_0 @ 000001e68fd95dc0] [FILE @ 0000009fb7ffee70] Error occurred in CreateFileMapping()
Error: [Parsed_drawtext_0 @ 000001e68fd95dc0] The text file 'OverlayFiles/OverlayFile_MyPC.txt' could not be read or is empty
Error: [vf#0:0 @ 000001e68fd48300] Error while filtering: Operation not permitted
Error: [vf#0:0 @ 000001e68fd48300] Task finished with error code: -1 (Operation not permitted)


  


  Error message received from ffmpeg with the use of a temp file that's replacing the original file :

  


  Error: [Parsed_drawtext_0 @ 0000014c815e6200] [FILE @ 000000253d7fee70] Cannot read file 'OverlayFiles/OverlayFile_MyPC.txt': Permission denied
Error: [Parsed_drawtext_0 @ 0000014c815e6200] The text file 'OverlayFiles/OverlayFile_MyPC.txt' could not be read or is empty
Error: [vf#0:0 @ 0000014c81597280] Error while filtering: Permission denied
Error: [vf#0:0 @ 0000014c81597280] Task finished with error code: -13 (Permission denied)
Error: [vf#0:0 @ 0000014c81597280] Terminating thread with return code -13 (Permission denied)


  


  ffmpeg arguments :

  


  string arguments = $"-video_size 1920x1080 -framerate 30 -f gdigrab -i desktop -c:v libx264rgb -crf 0 -preset ultrafast -color_range 2 " +
                   $"-vf \"drawtext=fontfile=C\\\\:/Windows/fonts/consola.ttf:fontsize=30:fontcolor='white':textfile={overlayFilePath_}:boxcolor=0x00000080:box=1:x=10:y=H-210:reload=1\" \"" + 
                   outputFile + "\"";


  


  The code that updates the overlay file (1st version) :

  


  public void UpdateOverlayText(string filePath)
{
    string usage = GetSystemUsage(filePath);  // Get the system usage data

    try
    {
        // Open the file with FileShare.ReadWrite to allow other processes to read it while writing
        using (var fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite))
        {
            using (var writer = new StreamWriter(fileStream))
            {
                writer.Write(usage);  // Write the system usage data to the file
            }
        }

        // Ensure file permissions are set correctly after writing
        SetFilePermissions(filePath);
    }
    catch (IOException ex)
    {
        Console.WriteLine($"Error updating overlay file: {ex.Message}");
    }
}


  


  (UPDATE)Code that updates overlay file using MemoryStream :

  


  public void UpdateOverlayText(string filePath)
{
    string usage = GetSystemUsage(filePath);

    try
    {
        using (var memoryStream = new MemoryStream())
        {
            using (var writer = new StreamWriter(memoryStream))
            {
                writer.Write(usage);
                writer.Flush();

                memoryStream.Position = 0;

                File.WriteAllBytes(filePath, memoryStream.ToArray());
            }
        }

        SetFilePermissions(filePath);
    }
    catch (IOException ex)
    {
        Console.WriteLine($"Error updating overlay file: {ex.Message}");
    }
}


  


  Code tested using MemoryStream and Temp file :

  


  public void UpdateOverlayText(string filePath)
{
    string usage = GetSystemUsage(filePath);
    string tempFilePath = filePath + ".tmp";
    try
    {
        // Write to a temporary file first
        using (var memoryStream = new MemoryStream())
        {
            using (var writer = new StreamWriter(memoryStream))
            {
                writer.Write(usage);
                writer.Flush();

                memoryStream.Position = 0;
                File.WriteAllBytes(tempFilePath, memoryStream.ToArray());
            }
        }
        File.Replace(tempFilePath, filePath, null);
    }
    catch (IOException ex)
    {
        Console.WriteLine($"Error updating overlay file: {ex.Message}");
    }
    finally
    {
        if (File.Exists(tempFilePath))
        {
            File.Delete(tempFilePath);
        }
    }
}


  


  Thanks in advance for your help and sorry for any typo or wrong phrases I used.

  


• Show the filename being processed when using an input list and an error occurs ?

  17 février 2024, par GeoNomad

  I am concatenating a large number of short files using a list.

  


  One in a hundred seems to have an error of one sort or another which stops the processing.

  


  


  1. Is there a way to tell ffmpeg to just drop the bad frame or even bad file and continue ?

     


  


  2. If not, is there a way to know what file has the error so I can just remove that file from the list ?

     


  


  


  ffmpeg -safe 0  -f concat -i list.txt -c copy FEEDER.mp4

  


  I have tried -loglevel verbose, but that did not help.

  


  [concat @ 0000022d22b23480] h264_mp4toannexb filter failed to receive output packet
Error demuxing input file 0: Invalid data found when processing input
Terminating demuxer thread 0
list.txt: Invalid data found when processing input


  


  How do I find out which file of the several hundred files in list.txt is the culprit ?

  


  As it happens, these files have time stamps and I can find it by looking at the last output frame and then deleting the appropriate file. But it seems there should be a better way.

  


  FWIW I am working in Windows cmd.exe or Powershell Terminal

  


• How can I debug this rtmp stream ? It wont play on Vlc, and logs show no error

  12 avril 2020, par SquirrelSenpai

  I am creating a rtmp stream using FFMPEG and sending the data to local NGINX server with the RTMP module.

  



  When playing the stream in VLC I am unable to hear any music. Have I missed something ?

  



  No FFMPEG errors according to logs

  



  fmpeg -hide_banner -loglevel warning -i http://x.x.x.x:8138 -f mp3 rtmp://localhost/live


  



  To test VLC >> Open Network Stream >> rtmp ://localhost/live

  



  Nginx.conf

  



  worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

rtmp_auto_push on;

rtmp{

        server{

                listen 1935;

                application live {

                        # enable live streaming
                        live on;
                        record off;

                        # publish only from localhost
                        allow publish all;
                        allow play all;

                }

        }

}