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• Fluent-ffmpeg Node.js overlay audio

  10 avril 2017, par Dineshkarthik Raveendran

  Using fluent-ffmpeg am trying to merge a set of videos into a single video, which am able to achieve with the following code :

     var ffmpeg = require('fluent-ffmpeg'),
  
          command = ffmpeg(), 
  
          videoNames = ['video1.mp4', 'video2.mp4', 'video3.mp4'];
  
  
  
      videoNames.forEach(function(videoName){
  
          command = command.addInput(videoName);
  
      });
  
      command.mergeToFile('output.mp4')
  
      .on('error', function(err) {
  
          console.log('Error ' + err.message);
  
      })
  
      .on('end', function() {
  
          console.log('Finished!');
  
      });

  In additon to the above am trying to overlay an audio to the merged video without removing the existing audio. What am trying to do is replicate the following command line using fluent-ffmpeg wrapper

  ffmpeg -i io1.mp4 -i io2.mp4 -i io3.mp4 -i io4.mp4 -i io5.mp4 -i io6.mp4 -i audio.mp3 -filter_complex '[0:a][1:a][2:a][3:a][4:a][5:a]concat=n=7:v=0:a=1,volume=1[aout];[6]volume=0.1[bout];[aout][bout]amerge=[tout];[0:v][1:v][2:v][3:v][4:v][5:v]concat=n=6:v=1:a=0[v1]' -map [v1] -map [tout] -c:a aac -b:a 96K  -shortest -y out.mp4

  Tried the following but unable to implement the filter_complex with streams properly

  var ffmpeg = require('fluent-ffmpeg'),
  
      command = ffmpeg(), 
  
      videoNames = ['video1.mp4', 'video2.mp4', 'video3.mp4'];
  
  
  
  videoNames.forEach(function(videoName){
  
      command = command.addInput(videoName);
  
  });
  
  command.addInput("myAudio.mp3")
  
          .audioFilters('volume=0.1'); // trying to overlay new audio without removing existing audio
  
  command.mergeToFile('output.mp4')
  
  .on('error', function(err) {
  
      console.log('Error ' + err.message);
  
  })
  
  .on('end', function() {
  
      console.log('Finished!');
  
  });

  Which throw the error Error ffmpeg exited with code 1: Cannot find a matching stream for unlabeled input pad 6 on filter Parsed_concat_0

• avio_open crashes, avcodec_copy_context doesn't work

  5 mars 2017, par Nulano

  I’m trying to port https://ffmpeg.org/doxygen/trunk/doc_2examples_2remuxing_8c-example.html to JavaCPP Presets for FFmpeg https://github.com/bytedeco/javacpp-presets/tree/master/ffmpeg.

  I have this so far :

  av_register_all();
  
  
  
  AVFormatContext inFmtCtx = new AVFormatContext(null);
  
  if (avformat_open_input(inFmtCtx, "file.ts", null, null) != 0)
  
      throw new Exception("Could not open input file");
  
  if (avformat_find_stream_info(inFmtCtx, (PointerPointer)null) != 0)
  
      throw new Exception("Failed to retrieve input stream information");
  
  av_dump_format(inFmtCtx, 0, "file.ts", 0);
  
  
  
  AVFormatContext outFmtCtx = new AVFormatContext(null);
  
  avformat_alloc_output_context2(outFmtCtx, null, null, "file2.ts");
  
  AVOutputFormat outFmt = outFmtCtx.oformat();
  
  for (int i = 0; i < inFmtCtx.nb_streams(); i++) {
  
      AVStream inStr = inFmtCtx.streams(i);
  
      AVStream outStr = avformat_new_stream(outFmtCtx, inStr.codec().codec());
  
      if (outStr.isNull()) throw new Exception("Failed allocating output stream");
  
      if (avcodec_copy_context(outStr.codec(), inStr.codec()) != 0)
  
          throw new Exception("Failed to copy context from input to"+
  
                              " output stream codec context");
  
      if ((outFmtCtx.oformat().flags() & AVFMT_GLOBALHEADER) != 0)
  
          outStr.codec().flags(outStr.codec().flags() | CODEC_FLAG_GLOBAL_HEADER);
  
  }
  
  av_dump_format(outFmtCtx, 0, "file2.ts", 1);
  
  
  
  if ((outFmt.flags() & AVFMT_NOFILE) == 0)
  
      if (avio_open(outFmtCtx.pb(), "file2.ts", AVIO_FLAG_WRITE) != 0)
  
          throw new Exception("Could not open output file");

  The problem is, that the avio_open call causes the JVM to crash with an access violation.

  Stack: [0x00000000037e0000,0x00000000038e0000],  sp=0x00000000038df6d0,  free space=1021k
  
  Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
  
  C  [avformat-57.dll+0x28877]
  
  C  [jniavformat.dll+0x383cb]
  
  C  0x0000000003bcdfcc
  
  
  
  Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
  
  j  org.bytedeco.javacpp.avformat.avio_open(Lorg/bytedeco/javacpp/avformat$AVIOContext;Ljava/lang/String;I)I+0
  
  j  TestRemuxer.main([Ljava/lang/String;)V+226
  
  v  ~StubRoutines::call_stub

  This is the output (without the crash message) :

  Input #0, mpegts, from 'file.ts':
  
    Duration: 00:00:17.60, start: 0.000000, bitrate: 1016 kb/s
  
    Program 1 
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 636x480 [SAR 900:901 DAR 45:34], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
  
      Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 194 kb/s
  
  Output #0, mpegts, to 'file2.ts':
  
      Stream #0:0: Unknown: none
  
      Stream #0:1: Unknown: none

  I suspect the cause of the access violation is the same as what causes the output streams to be unknown. However, if I pause debugging on the second av_dump_format call, I can use Evaluate to verify, that the codecs were copied properly. (I checked the FFmpeg sources, and I know that a stream is dumped as Unknown, if and only if its codec_type is set to an invalid value, however the value is correctly 0 for the first stream and 1 for the second stream.)

• How can I use my exe in a new Process() call ?

  24 février 2017, par looksgoodhoss

  I am working on a project where I create a 10 second sample from a video. To do this, I am using FFMPEG. I would like for the user to upload their own video where the sampling will then take place. The processing will be done in an Azure worker-role and that is where my problem lies.

  If I execute the following command (excuse the absolute paths, they’re my next problem) in Command Prompt then the sampling is completed successfully.

  ffmpeg -t 10 -i C:\Users\looksgoodhoss\Documents\Videos\video.mp4 -map_metadata 0 -acodec copy C:\Users\looksgoodhoss\Documents\Videos\vid.mp4 -y

  I am trying to bring this command into my Visual Studio project via a new Process() call. The video.mp4 and vid.mp4 are trivial names to test and work out my bug.

  bool success = false;
  
              string EXEArguements = @"ffmpeg -t 10 -i C:\Users\looksgoodhoss\Documents\Videos\video.mp4 -map_metadata 0 -acodec copy C:\Users\looksgoodhoss\Documents\Videos\vid.mp4 -y";
  
              string EXEPath = Path.Combine(Environment.GetEnvironmentVariable("RoleRoot") + @"\", @"approot\ffmpeg.exe");
  
  
  
              try
  
              {
  
                  Process proc = new Process();
  
                  //proc.StartInfo.FileName = @"C:\FFMPEG\bin\ffmpeg";
  
                  proc.StartInfo.FileName = EXEPath;
  
                  proc.StartInfo.Arguments = EXEArguements;
  
                  proc.StartInfo.CreateNoWindow = true;
  
                  proc.StartInfo.UseShellExecute = false;
  
                  proc.StartInfo.ErrorDialog = false;
  
  
  
                  Trace.TraceInformation("FFMPEG completed."); // is shown in log
  
  
  
                  proc.Start();
  
                  proc.WaitForExit();
  
                  success = true;
  
              }
  
              catch (Exception e)
  
              {
  
                  throw;
  
              }
  
              return success;

  The message "FFMPEG completed" is shown in the Compute Emulator UI and so I know that this block of code is executing, however, they’re is no sample video created despite the command being the same.

  Am I executing FFMPEG incorrectly in my Visual Studio project ? I think this is my problem because the same command can successfully be performed through Command Prompt.

  Any help or advice would be greatly appreciated,

  Thanks.