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• FFmpeg raw video size parameter

  3 novembre 2019, par Yanick Salzmann

  I am using libavformat in my library to read a stream of raw i420 images and transform them into an mp4 video. I’ve found CLI commands that perform this but since I am using the library in my program I need to reconstruct the same thing.

  Currently the code that is having a problem is looking like this :

          const auto raw_format = av_find_input_format("rawvideo");
  
          if (raw_format == nullptr) {
  
              log->error("Could not find RAW input parser in FFmpeg");
  
              throw std::runtime_error("RAW not found");
  
          }
  
  
  
          _format_context->pb = _io_context.get();
  
  
  
          AVDictionary *input_options = nullptr;
  
          av_dict_set(&input_options, "framerate", std::to_string(fps).c_str(), 0);
  
          av_dict_set(&input_options, "pix_fmt", "yuv420p", 0);
  
          av_dict_set(&input_options, "s:v", fmt::format("{}x{}", width, height).c_str(), 0);
  
          av_dict_set(&input_options, "size", fmt::format("{}x{}", width, height).c_str(), 0);
  
  
  
          auto formatPtr = _format_context.get();
  
          auto res = avformat_open_input(&formatPtr, "(memory file)", raw_format, &input_options);

  Finding the rawvideo is no problem, but it fails in avformat_open_input with the error : [2019-11-03 15:03:22.953] [11599:11663] [ffmpeg] [error] Picture size 0x0 is invalid

  I assumed the sizes are something I can insert using the input options, since in the CLI version it is passed using -s:v 1920x1080, however this does not seem to be true.

  Where do I have to specify the dimensions of my raw input stream ?

• Why my nodejs giving this problem while starting to run rtsp ?

  14 novembre 2019, par Rajaram

  While starting the server for the first time just after the code checkout , my react js project is throwing error "events.js:187 throw er ; // Unhandled ’error’ event" . I have node 13.1.0 and npm 6.12.1.

  [
  
    '-rtsp_transport',
  
    'tcp',
  
    '-i',
  
    'rtsp://user:user123@192.168.1.100:88/videoSub',
  
    '-f',
  
    'mpeg1video',
  
    '-b:v',
  
    '1000k',
  
    '-an',
  
    '-r',
  
    '24',
  
    '-'
  
  ]
  
  events.js:187
  
        throw er; // Unhandled 'error' event
  
        ^
  
  
  
  Error: spawn ffmpeg ENOENT
  
      at Process.ChildProcess._handle.onexit (internal/child_process.js:264:19)
  
      at onErrorNT (internal/child_process.js:456:16)
  
      at processTicksAndRejections (internal/process/task_queues.js:80:21)
  
  Emitted 'error' event on ChildProcess instance at:
  
      at Process.ChildProcess._handle.onexit (internal/child_process.js:270:12)
  
      at onErrorNT (internal/child_process.js:456:16)
  
      at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  
    errno: -2,
  
    code: 'ENOENT',
  
    syscall: 'spawn ffmpeg',
  
    path: 'ffmpeg',
  
    spawnargs: [
  
      '-rtsp_transport',
  
      'tcp',
  
      '-i',
  
      'rtsp://user:user123@192.168.1.100:88/videoSub',
  
      '-f',
  
      'mpeg1video',
  
      '-b:v',
  
      '1000k',
  
      '-an',
  
      '-r',
  
      '24',
  
      '-'
  
    ]
  
  }

• YouTube - MP4 to MP3 messes up

  23 novembre 2019, par theeSpark

  It’s supposed to download all the videos in the playlist and convert them to mp3. But all this does is make the mp4’s and 1 empty mp3 with a number higher than the max mp4. My newbie brain doesn’t know how to fix this...

  var ytpl = require('ytpl');
  
  var fs = require('fs-extra');
  
  var path = require('path');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var binaries = require('ffmpeg-static');
  
  var ytdl = require('ytdl-core');
  
  
  
  var output_dir = path.join(__dirname+"/dl");
  
  
  
  ytpl("PL8n8S4mVUWvprlN2dCAMoIo6h47ZwR_gn", (err, pl) => {
  
      if(err) throw err;
  
  
  
      let c = 0;
  
  
  
      pl.items.forEach((i) => {
  
          ytdl(i.url_simple+"", { filter: 'audioonly' }).pipe(fs.createWriteStream(output_dir+"/"+c+".mp4")).on('finish', () => {
  
              console.log("Finished MP4 DL, starting conversion...");
  
              ffmpeg(output_dir+"/"+c+".mp4")
  
                  .setFfmpegPath(binaries.path)
  
                  .format('mp3')
  
                  .audioBitrate(320)
  
                  .output(fs.createWriteStream(output_dir+"/"+c+".mp3"))
  
                  .on('end', () => {
  
                      console.log("Finished MP3 Convert...");
  
                  })
  
                  .run();
  
          });
  
          c++;
  
      });
  
  
  
  });