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• How to stream with ffmpeg via http protocol

  29 juillet 2022, par Boehmi

  I'm currently doing a stream that is supposed to display correctly within Flowplayer. 
First I send it to another PC via RTP. Here, I also checked with VLC that the codec etc. arrive correctly, which they do.

  



  Now I want to expose this stream to Flowplayer as a file, so it can be displayed, via something I used in VLC : 
http://localhost:8080/test.mp4
for example.

  



  The full line I got is : ffmpeg -i input -f mp4 http://localhost:8080/test.mp4

  



  However, no matter how I try to do this, I only get an input/output error. Is this only possible with something like ffserver or another ?

  



  What I think is this doesn't work because ffmpeg can't act as a server ; on VLC it works since it can. (Though VLC ruins the codecs I set and it can't be read afterwards for some reason)

  



  A (sort of) workaround I can use is saving the RTP stream to a file, and then letting flowplayer load it. This, however, only works once the file is not accessed anymore ; I get a codec error otherwise.

  


• How to concat the mp3 file and webm file into a new webm file ?

  12 août 2015, par it_is_a_literature

  There is a webm file that contains no audio. I want to merge an audio file with this video. I’ve tried the following command :

  ffmpeg -i /home/test.mp3  -i /home/output.webm -vcodec copy -acodec copy /home/newtest.webm

  And received the error :

  Could not write header for output file #0 (incorrect codec parameters ?):         Invalid argument.

• Can not find file with ffmpeg

  3 août 2018, par P.Ung

  I am programming a server in node.js to process a audio file.
  I save the file with this code :

  app.use(upload());
  
  app.get("/", function (req, res) {
  
  res.sendFile("index.html")
  
  });
  
  //Uploaded files will be saved
  
  app.post("/", function (req, res) {
  
  if (req.files) {
  
      var file = req.files.filename,
  
          filename = file.name;
  
      file.mv("./upload/" + filename, function (err) {
  
          if (err) {
  
              console.log("err");
  
          }
  
          else {
  
              res.send("Done");
  
              console.log(filename);
  
              convert(filename);
  
  
  
          }
  
      })
  
  }
  
  })

  I save the file in my upload directory. There everthing works great but now comes the problem.
  I convert the file with ffmpeg

  function convert(filename) {    
  
  var realName = "./upload/" + filename;
  
  var newName = "./output/" + filename.substr(0, filename.length - 4) + ".flac";
  
  ffmpegN = ffmpeg(realName);
  
  ffmpegN.audioBitrate(16).audioFrequency(16000).withAudioCodec('flac').format("flac").save(outputFile);
  
  
  
  ffmpeg(realName)
  
      .toFormat('flac')
  
      .on('error', (err) => {
  
          console.log('An error occurred: ' + err.message);
  
      })
  
      .on('progress', (progress) => {
  
          // console.log(JSON.stringify(progress));
  
          console.log('Processing: ' + progress.targetSize + ' KB converted');
  
      })
  
      .on('end', () => {
  
          console.log('Processing finished !');
  
      })
  
      .save(newName);//path where you want to save your file    
  
  SpeechToText(newName);
  
  }

  Then I want to pass this file to the google speech api. But then I get the error that the file is not found
  Here is the code for the Speech Api :

  function SpeechToText(path) {
  
  // The name of the audio file to transcribe
  
  const fileName = path;
  
  
  
  // Reads a local audio file and converts it to base64
  
  const file = fs.readFileSync(fileName);
  
  const audioBytes = file.toString('base64');
  
  
  
  // The audio file's encoding, sample rate in hertz, and BCP-47 language code
  
  const audio = {
  
      content: audioBytes,
  
  };
  
  const config = {
  
      encoding: 'FLAC',        
  
      languageCode: 'de-DE',
  
  };
  
  const request = {
  
      audio: audio,
  
      config: config,
  
  };
  
  
  
  // Detects speech in the audio file
  
  client
  
      .recognize(request)
  
      .then(data => {
  
          const response = data[0];
  
          const transcription = response.results
  
              .map(result => result.alternatives[0].transcript)
  
              .join('\n');
  
          console.log(`Transcription: ${transcription}`);
  
      })
  
      .catch(err => {
  
          console.error('ERROR:', err);
  
      });
  
  }

  The thing is that if I upload a file everything works. But if I try it for a second time the error occurs :

  fs.js:646
  
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
  
               ^
  
  
  
  Error: ENOENT: no such file or directory, open                 
  
  'C:\Users\paulu\desktop\API\output\sample.flac'
  
  at Object.fs.openSync (fs.js:646:18)
  
  at Object.fs.readFileSync (fs.js:551:33)
  
  at SpeechToText (C:\Users\paulu\desktop\API\server.js:68:21)
  
  at convert (C:\Users\paulu\desktop\API\server.js:121:5)
  
  at C:\Users\paulu\desktop\API\server.js:50:17
  
  at doMove (C:\Users\paulu\desktop\API\node_modules\express- 
  
  fileupload\lib\index.js:152:17)
  
  at WriteStream.<anonymous> (C:\Users\paulu\desktop\API\node_modules\express- 
  
  fileupload\lib\in                             dex.js:182:15)
  
  at emitNone (events.js:106:13)
  
  at WriteStream.emit (events.js:208:7)
  
  at fs.close (fs.js:2094:12)
  
  </anonymous>

  Thank you for all answers !