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• FFMPEG combining MP4 videos with same encoding not working, only showing first video

  13 avril 2020, par Ayudh

  My mp4 videos have the same encoding : h264

  



  I know because I ran this command on them :

  



  ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 a.mp4

  



  Now I combine them using the following command :

  



  ffmpeg -loglevel quiet -f concat -safe 0 -i video-list.txt -c copy video-final.mp4

  



  my video-list.txt file looks like this :

  



  file 'a.mp4'
file 'b.mp4'
file 'c.mp4'


  



  Now the video-final.mp4 which is the combined video actually has duration which is equal to the sum of its' component videos and also is quite larger in size. The issue is that when I play the video, it only plays the first video then stops.

  



  What's going on here ? Any insight would be appreciated.

  



  I've looked at : ffmpeg : Combine/merge multiple mp4 videos not working, output only contains the first video and the answers suggested there are the ones I'm using : specifically, concating from a text file containing the component videos.

  


• Batch combining multiple audio files with same picture to create mp4 files

  31 décembre 2017, par Mikael

  I need some help with batch combining hundreds of audio files (mp3s) that I fully own with the same picture to create mp4 files with identical names as the audios. It would be even better if I could do this on a parent directory with the audio files spread out in subdirectories rather than have all the audios in one large folder.

  I’ve tried using ffmpeg but am unable to do this in batch and on files with names that includes spaces. There are also seems to be some discrepancies between different ffmpeg versions but I’m using the latest one (20171229)

• Combining audio and video streams in ffmpeg in nodejs

  10 juillet 2015, par LouisK

  This is a similar question to Merge WAV audio and WebM video but I’m attempting to deal with two streams instead of static files. It’s kind of a multi-part question.

  It may be as much an ffmpeg question as a Node.js question (or more). I’ve never used ffmpeg before and haven’t done a ton of streaming/piping.

  I’m using Mauz-Khan’s MediaStreamCapture (an expansion on RecordRTC) in conjunction with Socket.io-stream to stream media from the browser to the server. From webkit this delivers independent streams for audio and video which I’d like to combine in a single transcoding pass.

  Looking at FFmpeg’s docs it looks like it’s 100% capable of using and merging these streams simultaneously.

  Looking at these NPM modules :

  https://www.npmjs.com/package/fluent-ffmpeg and https://www.npmjs.com/package/stream-transcoder

  Fluent-ffmpeg’s docs suggest it can take a stream and a bunch of static files as inputs, while stream-transcoder only takes a single stream.

  I see this as a use case that just wasn’t built in (or needed) by the module developers, but wanted to see if anyone had used either (or another module) to accomplish this before I get on with forking and trying to add the functionality ?

  Looking at the source of stream-transcoder it’s clearly setup to only use one input, but may not be that hard to add a second to. From the ffmpeg perspective, is adding a second input as simple as adding an extra source stream and an extra ’-i’ in the command ? (I think yes, but can foresee a lot of time burned trying to figure this out through Node).

  This section of stream-transcoder is where the work is really being done :

  /* Spawns child and sets up piping */
  
  Transcoder.prototype._exec = function(a) {
  
  
  
      var self = this;
  
  
  
      if ('string' == typeof this.source) a = [ '-i', this.source ].concat(a);
  
      else a = [ '-i', '-' ].concat(a);
  
  
  
      var child = spawn(FFMPEG_BIN_PATH, a, {
  
          cwd: os.tmpdir()
  
      });
  
      this._parseMetadata(child);
  
  
  
      child.stdin.on('error', function(err) {
  
          try {
  
              if ('object' == typeof self.source) self.source.unpipe(this.stdin);
  
          } catch (e) {
  
              // Do nothing
  
          }
  
      });
  
  
  
      child.on('exit', function(code) {
  
          if (!code) self.emit('finish');
  
          else self.emit('error', new Error('FFmpeg error: ' + self.lastErrorLine));
  
      });
  
  
  
      if ('object' == typeof this.source) this.source.pipe(child.stdin);
  
  
  
      return child;
  
  
  
  };

  I’m not quite experienced enough with piping and child processes to see off the bat where I’d add the second source - could I simply do something along the lines of this.source2.pipe(child.stdin) ? How would I go about getting the 2nd stream into the FFmpeg child process ?