Recherche avancée

Sur d’autres sites (6663)

• C# How do I set the volume of sound bytes[]

  23 juillet 2016, par McLucario

  Im trying to change the volume of sound bytes[] in C#. Im reading a sound file with FFMPEG and and wanna change the volume on the fly. I found some examples and but I didnt understand them.

  public void SendAudio(string pathOrUrl)
  
  {
  
      cancelVid = false;
  
      isPlaying = true;
  
  
  
      mProcess = Process.Start(new ProcessStartInfo
  
      { // FFmpeg requireqs us to spawn a process and hook into its stdout, so we will create a Process
  
          FileName = "ffmpeg",
  
          Arguments = "-i " + (char)34 + pathOrUrl + (char)34 + // Here we provide a list of arguments to feed into FFmpeg. -i means the location of the file/URL it will read from
  
          " -f s16le -ar 48000 -ac 2 pipe:1", // Next, we tell it to output 16-bit 48000Hz PCM, over 2 channels, to stdout.
  
          UseShellExecute = false,
  
          RedirectStandardOutput = true, // Capture the stdout of the process
  
          Verb = "runas"
  
      });
  
  
  
      while (!isRunning(mProcess)) { Task.Delay(1000); }
  
  
  
      int blockSize = 3840; // The size of bytes to read per frame; 1920 for mono
  
      byte[] buffer = new byte[blockSize];
  
      byte[] gainBuffer = new byte[blockSize];
  
      int byteCount; 
  
  
  
      while (true && !cancelVid) // Loop forever, so data will always be read
  
      {
  
          byteCount = mProcess.StandardOutput.BaseStream // Access the underlying MemoryStream from the stdout of FFmpeg
  
          .Read(buffer, 0, blockSize); // Read stdout into the buffer
  
  
  
          if (byteCount == 0) // FFmpeg did not output anything
  
              break; // Break out of the while(true) loop, since there was nothing to read.
  
  
  
          if (cancelVid)
  
              break;
  
  
  
          disAudioClient.Send(buffer, 0, byteCount); // Send our data to Discord
  
      }
  
      disAudioClient.Wait(); // Wait for the Voice Client to finish sending data, as ffMPEG may have already finished buffering out a song, and it is unsafe to return now.
  
      isPlaying = false;
  
      Console.Clear();
  
      Console.WriteLine("Done Playing!");

• Converting ffmpeg CLI command to ffmpeg-python to get bytes of a MPEG Transport Stream data stream ?

  28 août 2023, par kdeckerr

  I have the following code to get the bytes representing the data stream of a .ts video :

  


  def get_datastream_bytes(mpeg_ts_filepath):
    ffmpeg_command = [
        'ffmpeg', '-hide_banner', '-loglevel', 'quiet',
        '-i', mpeg_ts_filepath,
        '-map', '0:d',
        '-c', 'copy',
        '-copy_unknown',
        '-f', 'data',
        'pipe:1'
    ]

    try:
        output_bytes = subprocess.check_output(ffmpeg_command, stderr=subprocess.STDOUT)
        print("Output bytes length:", len(output_bytes))
        return output_bytes
    except subprocess.CalledProcessError as e:
        print("Error:", e.output)


  


  I can then wrap the returned value in io.BytesIO and parse the resulting bytes using another library (klvdata).

  


  This code was fashioned upon a ffmpeg CLI command I adapted from this SO Answer.

  


  ffmpeg -i "C:\inputfile.ts" -map 0:d -c copy -copy_unknown -f:d data pipe:1


  


  ---

  


  What I would really like to do is utilize the Python ffmpeg bindings in ffmpeg-python so that users do not have to install ffmpeg locally. Thus, I have attempted to get a bytes stream from an ffmpeg call like so :

  


  bytestream = (
    ffmpeg.input(input_file)
        .output("pipe:", format="data", codec="copy", copy_unknown=True)
        .run(capture_stdout=True)
)


  


  Though, this and many other, attempts at utilizing ffmpeg-python generally end with the same error :

  


  


  Output #0, data, to 'True' :
[out#0/data @ 00000...] Output file does not contain any stream
Error opening output file True.
Error opening output files : Invalid argument
Traceback (most recent call last) :
...
raise Error('ffmpeg', out, err)
ffmpeg._run.Error : ffmpeg error (see stderr output for detail)

  


  


  ---

  


  How do I convert the ffmpeg CLI command

  


  ffmpeg -i "C:\inputfile.ts" -map 0:d -c copy -copy_unknown -f:d data pipe:1


  


  To an ffmpeg-python call ?

  


• reading ffmpeg output and sending it to a form

  3 juillet 2013, par Aeon2058

  I can run arguments through ffmpeg just fine, but I need to be able to read its output LIVE as it streams (as you may know, ffmpeg can take a while, and it updates its stderr twice a second with current frame, etc).

  I have a form called prog that was declared globally with ProgressForm prog = new ProgressForm(); The user inputs a folder of video files, some data is gathered, and then a button is pushed to start the encoding process with ffmpeg. The button_click event creates a new thread like so :

   runFFMpeg = new Thread(run_ffmpeg);
  
   runFFMpeg.start();

  runFFMpeg was initialized globally earlier with private Thread runFFMpeg;.

  Now I have the method run_ffmpeg :

  private void run_ffmpeg()
  
  {
  
      string program = "C:\\ffmpeg64.exe";
  
      string args = //some arguments that I know work;
  
  
  
      ProcessStartInfo run = new ProcessStartInfo(program,args);
  
      run.UseShellExecute = false;
  
      run.CreateNoWindow = true;
  
      run.RedirectStandardOutput = true;
  
      run.RedirectStandardError = true;
  
      Process runP = new Process();
  
      runP = Process.Start(run);
  
      runP.WaitForExit();
  
  
  
      //NOW WHAT?
  
  
  
   }

  I'm not sure what to do now to get the data LIVE, but if I can, I would be updating prog, which has a number of controls, including progress bars, etc. Typical output (that I'm interested in) looks like "frame= 240 fps= 12.8 q=0.0 size= 1273802kB time=00:00:08.008 bitrate=4415.2kbits/s dup=46 drop=0". I know how to parse that to get what I need, I just need that line !