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• c# Process data piping : 'The pipe has ended'

  9 août 2024, par user2224583

  There are two process I am handling. Ffmpeg and fpcalc.

  


  I have completed my appplication by encoding a wav file with ffmpeg, and reading it for purposes of chromaprinting with fpcalc.

  


  However, I think the next step is to skip the saving of a wav file, and pipe the data directly into the fpcalc process.

  


  I've been trying to understand how to pipe the stream data from ffpmeg stdout into the fpcalc process stdin.

  


  Some of the code I've been testing and reading (below) has come from other answers, with regards to piping data out of a Process object in c#, specifically with ffmpeg, found here on Stack

  


  private static void ExtractPCMAudio(string input, int duration)
    {
        Process proc = new Process();

        proc.StartInfo.FileName = @"ffmpeg.exe";
        proc.StartInfo.Arguments = $"-t 00:3:00 -i \"{input}\" -f wav -ac 1 -acodec pcm_s16le -ar 16000 -"; //"-" Dash pipes the stream
        proc.StartInfo.UseShellExecute = false;
        proc.StartInfo.RedirectStandardInput = true;
        proc.StartInfo.RedirectStandardOutput = true;

        proc.Start();

        FileStream baseStream = proc.StandardOutput.BaseStream as FileStream;

        byte[] audioBytes = null;
        int lastRead = 0;

        using (MemoryStream ms = new MemoryStream())
        {            
            byte[] buffer = new byte[4096];
            do
            {
                lastRead = baseStream.Read(buffer, 0, buffer.Length);
                ms.Write(buffer, 0, lastRead);
            } while (lastRead > 0);

            audioBytes = ms.ToArray();
        }
        
        proc.StandardInput.BaseStream.Close();
        
        baseStream.Close();
        FingerPrintAudio(audioBytes);
        Console.WriteLine("Done!");
        
    }


private static void FingerPrintAudio(byte[] audioBytes)
    {
        
        var fpcalc = "fpcalc.exe";
        var procStartInfo =
            new ProcessStartInfo(fpcalc, $" -raw -length 600 -json") 
            {
                RedirectStandardOutput = true,
                RedirectStandardInput = true,
                RedirectStandardError  = true,
                UseShellExecute        = false,
                CreateNoWindow         = true,
            };

        var process = new Process {StartInfo = procStartInfo};
        process.Start();            
        
        process.StandardInput.BaseStream.Write(audioBytes, 0, audioBytes.Length); //<--This is where the piping error happens.

        string processOutput = null;
        using (var sr = new StreamWriter("Test.json"))
        {
            while ((processOutput = process.StandardOutput.ReadLine()) != null)
            {
                sr.WriteLine(processOutput);
                Console.WriteLine(processOutput);
            }
            sr.Close();
        }
        
    }


  


  Throughout many variations of the code, posted above, I seem to encounter an error : 'the pipe has ended'.
I think it is a buffering error, where the process handling fpcalc is expecting more byte data, but is cut short ?

  


  Perhaps there is a better way to send stream data from one process and use it in a second process ?

  


• Error while downloading video stream with streamlink + ffmpeg : Pipe copy aborted error

  29 novembre 2020, par beta

  I am trying to download a big video with the following command with Streamlink. Streamlink in the background uses ffmpeg. So what I get is actually an ffmpeg error.

  


  This is the command I use :

  


  streamlink --loglevel debug --hls-live-restart -o test.mp4 "https://aivottjab-a.akamaihd.net/IAD/jab-assets/jab-prod-iad/out/v1/732334e942a4465b8af9b21077d4e61d/cenc-083bb0.mpd?encoding=segmentBase&amznDtid=AOAGZA014O5RE" best


  


  This is the error I get after 26GB are downloaded.

  


  [19:48:27,437][stream.dash][debug] Download of segment: https://aivottjab-a.akamaihd.net/IAD/jab-assets/jab-prod-iad/out/v1/732334e942a4465b8af9b21077d4e61d/cenc_video_117_0_5791117.mp4 complete
[download][test.mp4] Written 25.97 GB (2h24m58s @ 1.0 MB/s)                                                         
[19:49:27,503][stream.ffmpegmux][error] Pipe copy aborted: \\.\pipe\ffmpeg-12796-364
[19:49:27,518][stream.ffmpegmux][error] Pipe copy aborted: \\.\pipe\ffmpeg-12796-967


  


  Anyone knows why this comes up ?

  


  I am on Windows 10, Streamlink 1.7.0 and FFmpeg 4.3.1.

  


• How to pipe Csound output to ffmpeg for conversion without an intermediate file ?

  23 novembre 2020, par Ciro Santilli 郝海东冠状病六四事件法轮功

  On Ubuntu 20.04, Csound 6.13.0, ffmpeg 4.2.4 this plays fine :

  


  git clone https://github.com/csound/csound
cd csound
git checkout 92409ecce053d707360a5794f5f4f6bf5ebf5d24
csound examples/xanadu.csd


  


  and I can save to file with :

  


  csound -o xanadu.wav xanadu.csd
ffplay xanadu.wav


  


  or :

  


  csound -W -o stdout xanadu.csd > xanadu-stdout.wav


  


  and even convert from file :

  


  ffmpeg -i xanadu-stdout.wav xanadu-stdout.ogg
ffplay xanadu-stdout.ogg


  


  or :

  


  cat xanadu-stdout.wav | ffmpeg -f wav -i - xanadu.ogg


  


  or :

  


  csound -W -o stdout xanadu.csd | cat > xanadu-cat.wav



  


  So why does this fail from the direct pipe :

  


  csound -W -o stdout xanadu.csd | ffmpeg -f wav -i - xanadu.ogg


  


  or :

  


  csound -W -o stdout xanadu.csd | cat > xanadu-cat.wav
ffmpeg -y -f wav -i xanadu-cat.wav xanadu.ogg


  


  with :

  


  [wav @ 0x56093284c6c0] invalid start code d[163][3][0] in RIFF header
xanadu-cat.wav: Invalid data found when processing input


  


  So it seems that xanadu.wav and xanadu-cat.wav are different :

  


  $ diff -u xanadu.wav xanadu-cat.wav
Binary files xanadu.wav and xanadu-cat.wav differ


  


  and that makes the conversion fail.

  


  I know about :

  


  csound --ogg -o xanadu.ogg xanadu.csd


  


  which does work, but I just want to pipe into ffmpeg for fun.

  


  Also asked at : https://github.com/csound/csound/issues/1408