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• How to check when ffmpeg completes a task ?

  25 mai 2018, par Andrew

  I’m just learning how to use ffmpeg a few hours ago to generate video thumbnails.

  These are some results :

  

  

  I’d used the same size (width - height) to Youtube’s. Each image contains max 25 thumbnails (5x5) with the size 160x90.

  Everything looks good until :

  public async Task GetVideoThumbnailsAsync(string videoPath, string videoId)
  
  {
  
      byte thumbnailWidth = 160;
  
      byte thumbnailHeight = 90;
  
  
  
      string fps = "1/2";
  
  
  
      videoPath = Path.Combine(_environment.WebRootPath, videoPath);
  
  
  
      string videoThumbnailsPath = Path.Combine(_environment.WebRootPath, $"assets/images/video_thumbnails/{videoId}");
  
      string outputImagePath = Path.Combine(videoThumbnailsPath, "item_%d.jpg");
  
  
  
      Directory.CreateDirectory(videoThumbnailsPath);
  
  
  
      using (var ffmpeg = new Process())
  
      {
  
          ffmpeg.StartInfo.Arguments = $" -i {videoPath} -vf fps={fps} -s {thumbnailWidth}x{thumbnailHeight} {outputImagePath}";
  
          ffmpeg.StartInfo.FileName = Path.Combine(_environment.ContentRootPath, "FFmpeg/ffmpeg.exe");
  
          ffmpeg.Start();
  
      }
  
  
  
      await Task.Delay(3000);
  
  
  
      await GenerateThumbnailsAsync(videoThumbnailsPath, videoId);
  
  }

  I’m getting a trouble with the line :

  await Task.Delay(3000);

  When I learn the way to use ffmpeg, they didn’t mention about it. After some hours failed, I notice that :

  An mp4 video (1 min 31 sec - 1.93Mb) requires some delay time 1000ms. And other, an mp4 video (1 min 49 sec - 7.25Mb) requires some delay time 3000ms.

  If I don’t use Task.Delay and try to get all the files immediately, it would return 0 (there was no file in the directory).

  Plus, each file which has a difference length to the others requires a difference delay time. I don’t know how to calculate it.

  And my question is : How to check when the task has completed ?

  P/s : I don’t mean to relate to javascript, but in js, there is something called Promise :

  var promise = new Promise(function (done) {
  
      var todo = function () {
  
          done();
  
      };
  
  
  
      todo();
  
  });
  
  
  
  promise.then(function () {
  
      console.log('DONE...');
  
  });

  I want to edit the code like that.

  Thank you !

• Transcode each stream in a different thread with ffmpeg

  30 mai 2018, par hedgar2017

  Is there a way of forcing ffmpeg to encode each audio stream in a different thread ?

  ffmpeg
  
      -i audio1.ac3 -c:a libopus
  
      -i audio2.ac3 -c:a libopus
  
      -i audio3.ac3 -c:a libopus
  
      output.mkv

  I mean only ffmpeg’s own instruments, without multiple processes and other OS features.

  Normally, there is only one core saturated, so encoding a file with many audio streams is very long.

  Exact command :

  ffmpeg -loglevel verbose
  
      -i 'Ярость (Fury).mkv'
  
      -i 'Fury (2014) [Ukr & Eng, Sub Eng] BDRip-AVC [Hurtom & HELLYWOOD].mkv'
  
      -threads 0 -max_muxing_queue_size 65536 -avoid_negative_ts 1 -metadata title=2014.Fury.BDRip.HEVC.1080p
  
      -map 0:0 -c:v copy -metadata:s:v:0 title=2014.Fury.BDRip.HEVC.1080p -disposition:v:0 +defaug-[forced
  
      -map 0:2 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:0 language=eng -metadata:s:a:0 title=Original -disposition:a:0 +defaug-[forced
  
      -map 1:1 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:1 language=ukr -disposition:a:1 -default-forced
  
      -map 0:1 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:2 language=rus -metadata:s:a:2 title=Dub -disposition:a:2 -default-forced
  
      -map 0:10 -c:s copy -metadata:s:s:0 language=eng -metadata:s:s:0 title=Original -disposition:s:0 -default-forced
  
      -f matroska ./2014.Fury.BDRip.HEVC.1080p.mkv

  Log :

  ... inputs ...
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:2 -> #0:1 (dts (dca) -> opus (libopus))
  
    Stream #1:1 -> #0:2 (ac3 (native) -> opus (libopus))
  
    Stream #0:1 -> #0:3 (ac3 (native) -> opus (libopus))
  
    Stream #0:10 -> #0:4 (copy)
  
  Press [q] to stop, [?] for help
  
  [graph_2_in_0_1 @ 0000019ca2cb29c0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_3 @ 0000019ca2cb20c0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_3'
  
  [auto_resampler_0 @ 0000019ca2cb27c0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca2c9f3c0] No bit rate set. Defaulting to 384000 bps.
  
  [graph_0_in_0_2 @ 0000019ca2cb1ac0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_1 @ 0000019ca2cb1bc0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_1'
  
  [auto_resampler_0 @ 0000019ca2cb14c0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca292c980] No bit rate set. Defaulting to 384000 bps.
  
  [graph_1_in_1_1 @ 0000019ca2cb2bc0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_2 @ 0000019ca2cb26c0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_2'
  
  [auto_resampler_0 @ 0000019ca2cb0dc0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca292e980] No bit rate set. Defaulting to 384000 bps.
  
  Output #0, matroska, to './2014.Fury.BDRip.HEVC.1080p.mkv':
  
    Metadata:
  
      DATE_RELEASED   : 2014
  
      title           : 2014.Fury.BDRip.HEVC.1080p
  
      Released by     : Buba5473 for NNM-Club
  
      Copyright       : Encoded by Goor80
  
      encoder         : Lavf58.12.100
  
      Chapter #0:0: start 0.000000, end 478.228000
  
      Metadata:
  
        title           : Chapter 01
  
      ... chapters ...
  
      Stream #0:0: Video: hevc (Main 10), 1 reference frame, yuv420p10le(tv), 1920x800 (0x0) [SAR 1:1 DAR 12:5], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s (default)
  
      Stream #0:2(ukr): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s
  
      Stream #0:3(rus): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s
  
      Stream #0:4(eng): Subtitle: subrip
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=6175.5kbits/s speed=10.2x
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=7530.8kbits/s speed=8.74x
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=7955.1kbits/s speed=9.02x
  
  frame=156607 fps=205 q=-1.0 size= 8321971kB time=01:48:51.85 bitrate=10437.1kbits/s speed=8.55x
  
  ... not finished yet ...

  fps is always around 3000/number_of_audio_channels, meaning all audio transcoding is done with the only thread.

• ffmpeg install within existing Node.js docker image

  1er septembre 2021, par Peza

  I need to use ffmpeg in a Node.js application that runs in a docker container (created using docker-compose). I'm very new to Docker, and would like to know how to command Docker to install ffmpeg when creating the image.

  



  DockerFile

  



  FROM node:carbon
WORKDIR /usr/src/app

# where available (npm@5+)
COPY package*.json ./
RUN npm install -g nodemon
RUN npm install --only=production
COPY . .

EXPOSE 3000
CMD [ "npm", "start" ] 


  



  package.json :

  



  {
  "name": "radcast-apis",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node ./bin/www",
    "dev": "nodemon --inspect-brk=0.0.0.0:5858 ./bin/www"
  },
  "dependencies": {
    "audioconcat": "^0.1.3",
    "cookie-parser": "~1.4.3",
    "debug": "~2.6.9",
    "express": "~4.16.0",
    "firebase-admin": "^5.12.1",
    "http-errors": "~1.6.2",
    "jade": "~1.11.0",
    "morgan": "~1.9.0"
  },
  "devDependencies": {
    "nodemon": "^1.11.0"
  }
}


  



  docker-compose.yml :

  



  version: "2"
services:
  web:
    volumes:
    - "./app:/src/app"
    build: .
    command: npm run dev
    ports:
    - "3000:3000"
    - "5858:5858"