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• ffmpeg select highest quality video track and audio track in specific language from m3u8

  17 juin 2019, par smfs

  I have a bunch of .m3u8 files that contain video tracks in different resolutions and bitrates, and audio tracks in different laguages.
  I want to select the highest quality video stream and if available the audio track in a specified language.

  I know how to select the audio track, currently I use

  -map 0:m:language:en? 

  like this

  ffmpeg -re -protocol_whitelist file,http,https,tcp,tls -i .\some_file.m3u8 -codec:a aac -c:v copy -f flv -map 0:m:language:en? rtmp://foo.com:1935/live/xyz

  With that I only stream audio if the specified audio language is available, or audio and video in the default configuration if it’s not.

  I want to stream the best video track (the one ffmpeg picks by default) in both cases.

• Can't upload folder with large amount of files to google storage. I using "@ffmpeg-installer/ffmpeg" and @google-cloud/storage

  20 juillet 2022, par Dmytro

  I upload file to google storage using "@ffmpeg-installer/ffmpeg" and @google-cloud/storage in my node.js App.
Step 1. file uploading to fs is in child processes - one process for each type of resolution (totaly six).
step 2. encription (converting to stream)
step 3. upload to google storage

  


  I use "Upload a directory to a bucket" in order to send the video from the client to the Google Cloud Storage bucket.

  


  This way is working fine only with small video.

  


  for example when I upload video with duration one hour it split on chunk and totally I get more three thousands files. But the problem occurs when there are more than 1500 files

  


  So actually i upload folder with large amount of files, but not all of this files are uploaded to cloud.

  


  maybe someone had the similar problem and helps fix it.

  


  


  


  const uploadFolder = async (bucketName, directoryPath, socketInstance) => {
    try {
      let dirCtr = 1;
      let itemCtr = 0;
      const fileList = [];

      const onComplete = async () => {
        const folderName = nanoid(46);

        await Promise.all(
          fileList.map(filePath => {
            const fileName = path.relative(directoryPath, filePath);
            const destination = `${ folderName }/${ fileName }`;

            return storage
              .bucket(bucketName)
              .upload(filePath, { destination })
              .then(
                uploadResp => ({ fileName: destination, status: uploadResp[0] }),
                err => ({ fileName: destination, response: err })
              );
          })
        );

        if (socketInstance) socketInstance.emit('uploadProgress', {
          message: `Added files to Google bucket`,
          last: false,
          part: false
        });

        return folderName;
      };

      const getFiles = async directory => {
        const items = await fs.readdir(directory);
        dirCtr--;
        itemCtr += items.length;
        for(const item of items) {
          const fullPath = path.join(directory, item);
          const stat = await fs.stat(fullPath);
          itemCtr--;
          if (stat.isFile()) {
            fileList.push(fullPath);
          } else if (stat.isDirectory()) {
            dirCtr++;
            await getFiles(fullPath);
          }
        }
      }

      await getFiles(directoryPath);

      return onComplete();
    } catch (e) {
      log.error(e.message);
      throw new Error('Can\'t store folder.');
    }
  };

  


  


  



• Running ffmpeg.exe through windows service fails to complete while dealing with large files

  28 avril 2013, par Harun

  I am using ffmpeg.exe to convert video files to flv format. For that purpose i use a windows service to run the conversion process in background. While trying to convert large files(i experienced it when the file size is >14MB) through windows service it gets stuck at the line which starts the process(ie, process.start();).

  But when i tried to execute ffmpeg.exe directly from command prompt it worked with out any problems.

  My code in windows service is as follows :

  private Thread WorkerThread; 
  
  protected override void OnStart(string[] args)
  
  { 
  
  
  
     WorkerThread = new Thread(new ThreadStart(StartHandlingVideo));
  
     WorkerThread.Start();
  
  }
  
  
  
  protected override void OnStop()
  
  { 
  
     WorkerThread.Abort();
  
  }
  
  
  
  private void StartHandlingVideo()
  
  {   
  
     FilArgs = string.Format("-i {0} -ar 22050 -qscale 1 {1}", InputFile, OutputFile);
  
     Process proc;
  
     proc = new Process();
  
  
  
     try
  
     {
  
  
  
       proc.StartInfo.FileName = spath + "\\ffmpeg\\ffmpeg.exe";
  
       proc.StartInfo.Arguments = FilArgs;
  
       proc.StartInfo.UseShellExecute = false;
  
       proc.StartInfo.CreateNoWindow = false;
  
       proc.StartInfo.RedirectStandardOutput = true;
  
       proc.StartInfo.RedirectStandardError = true;
  
  
  
       eventLog1.WriteEntry("Going to start process of convertion");
  
  
  
       proc.Start();
  
  
  
       string StdOutVideo = proc.StandardOutput.ReadToEnd();
  
       string StdErrVideo = proc.StandardError.ReadToEnd();
  
  
  
       eventLog1.WriteEntry("Convertion Successful");
  
       eventLog1.WriteEntry(StdErrVideo);               
  
   }
  
   catch (Exception ex)
  
   {
  
       eventLog1.WriteEntry("Convertion Failed");
  
       eventLog1.WriteEntry(ex.ToString());            
  
   }
  
   finally
  
   {
  
       proc.WaitForExit();
  
       proc.Close();
  
   }

  How can I get rid of this situation.