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• Using dragonfly and ffmpeg to process a video in Rails

  26 novembre 2015, par Maikell

  I am writing a Ruby on Rails 4 Web application, that gives the user an image-upload functionality. For this I followed this tutorial, which is using the gems

  dragonfly
  
  jquery-fileupload-rails
  
  remotipart

  This is working fine.
  Now I want to extend the image-upload functionality, to upload videos as well. But unfortunately I’m stuck with it. Here is what I have tried so far :

  config/initializers/dragonfly.rb

  require 'dragonfly'
  
  
  
  # Configure
  
  Dragonfly.app.configure do
  
    plugin :imagemagick
  
  
  
    secret 'd045734b043b4383a246c5c8daf2d3e31217dc8b030f21861e4fd16c4b72d382'
  
  
  
    url_format '/media/:job/:name'
  
  
  
    datastore :file,
  
              root_path: Rails.root.join('uploads/images/'),
  
              server_root: Rails.root.join('uploads')
  
  end
  
  
  
  Dragonfly.app(:videos).configure do
  
    secret 'd045734b043b4383a246c5c8daf2d3e31217dc8b030f21861e4fd16c4b72d382'
  
  
  
    url_format "/media/:job/:name"
  
  
  
    datastore :file,
  
              root_path: Rails.root.join('uploads/videos/'),
  
              server_root: Rails.root.join('uploads')
  
  end
  
  
  
  # Logger
  
  Dragonfly.logger = Rails.logger
  
  
  
  # Mount as middleware
  
  Rails.application.middleware.use Dragonfly::Middleware
  
  
  
  # Add model functionality
  
  if defined?(ActiveRecord::Base)
  
    ActiveRecord::Base.extend Dragonfly::Model
  
    ActiveRecord::Base.extend Dragonfly::Model::Validations
  
  end

  models/video.rb

  class Video < ActiveRecord::Base
  
    dragonfly_accessor :video, app_name: :videos do
  
      storage_options do |video|
  
        { path: "videos/#{Video.gen_uuid}-#{video.name}.webm" }
  
      end
  
    end
  
  end

  I upload the video with ajax. It is succesfully saved in the systems /tmp-directory. Than in the video-controller I call

  @video = Video.new[video_params]
  
  @video.save

  Now the video-params are correctly saved in the database, but the video is not saved in the given directory /uploads/videos Also my goal is, to process the video with ffmpeg, to convert it to a webm. ffmpeg is installed in the system and converting a video on the command line works fine.

  • But how do I get dragonfly to start the conversion process and save the video in the rails project ? Where do I have to put the ffmpeg-commands to dragonfly ?
  • Why does dragonfly not save the video in the directory uploads/videos ?

  Everything works fine with images and imagemagick. Only videos are causing problems.

• Issue when combining 2 video files [after matching the specs]

  6 décembre 2015, par Rune

  Basically I got a .mp4 and a .flv file which I want to concatenate (the .mp4 should be the intro).

  So after having asked a previous question regarding this I went ahead and converted the intro video to an .flv with matching specifications of the second video.

  First I got the specifications of the second (.flv) video using ffprobe. This was the output :

  {
  
      "streams": [
  
          {
  
              "index": 0,
  
              "codec_name": "h264",
  
              "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
  
              "profile": "High",
  
              "codec_type": "video",
  
              "codec_time_base": "1/50",
  
              "codec_tag_string": "[0][0][0][0]",
  
              "codec_tag": "0x0000",
  
              "width": 646,
  
              "height": 364,
  
              "coded_width": 656,
  
              "coded_height": 368,
  
              "has_b_frames": 2,
  
              "sample_aspect_ratio": "1:1",
  
              "display_aspect_ratio": "323:182",
  
              "pix_fmt": "yuv420p",
  
              "level": 30,
  
              "chroma_location": "left",
  
              "refs": 5,
  
              "is_avc": "true",
  
              "nal_length_size": "4",
  
              "r_frame_rate": "25/1",
  
              "avg_frame_rate": "25/1",
  
              "time_base": "1/1000",
  
              "start_pts": 80,
  
              "start_time": "0.080000",
  
              "bit_rate": "400000",
  
              "bits_per_raw_sample": "8",
  
              "disposition": {
  
                  "default": 0,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0
  
              }
  
          },
  
          {
  
              "index": 1,
  
              "codec_name": "aac",
  
              "codec_long_name": "AAC (Advanced Audio Coding)",
  
              "profile": "LC",
  
              "codec_type": "audio",
  
              "codec_time_base": "1/44100",
  
              "codec_tag_string": "[0][0][0][0]",
  
              "codec_tag": "0x0000",
  
              "sample_fmt": "fltp",
  
              "sample_rate": "44100",
  
              "channels": 2,
  
              "channel_layout": "stereo",
  
              "bits_per_sample": 0,
  
              "r_frame_rate": "0/0",
  
              "avg_frame_rate": "0/0",
  
              "time_base": "1/1000",
  
              "start_pts": 241,
  
              "start_time": "0.241000",
  
              "bit_rate": "96000",
  
              "disposition": {
  
                  "default": 0,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0
  
              }
  
          }
  
      ],
  
      "format": {
  
          "filename": "vid2.flv",
  
          "nb_streams": 2,
  
          "nb_programs": 0,
  
          "format_name": "flv",
  
          "format_long_name": "FLV (Flash Video)",
  
          "start_time": "0.080000",
  
          "duration": "371.920000",
  
          "size": "23876671",
  
          "bit_rate": "513587",
  
          "probe_score": 100,
  
          "tags": {
  
              "audiosize": "4476626",
  
              "canSeekToEnd": "true",
  
              "datasize": "23876671",
  
              "videosize": "19004263",
  
              "hasAudio": "true",
  
              "hasCuePoints": "false",
  
              "hasKeyframes": "true",
  
              "hasMetadata": "true",
  
              "hasVideo": "true",
  
              "lasttimestamp": "372",
  
              "metadatacreator": "flvtool++ (Facebook, Motion project, dweatherford)",
  
              "totalframes": "9298",
  
              "encoder": "Lavf56.36.100"
  
          }
  
      }
  
  }

  Here’s my command :

  -i prefix.mp4 -b:v 400k -b:a 96k -r 25 -ar 44100 -acodec aac -vf scale=646:364 -strict -2 prefix.flv.

  This produces the following output (as well as the video file) :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55.  4.100 / 55.  4.100
  
    libavcodec     57.  7.100 / 57.  7.100
  
    libavformat    57.  8.102 / 57.  8.102
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 12.100 /  6. 12.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'prefix.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.8.102
  
    Duration: 00:00:05.31, start: 0.000000, bitrate: 1589 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1205 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 384 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, flv, to 'prefix.flv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.8.102
  
      Stream #0:0(und): Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 646x364 [SAR 2912:2907 DAR 16:9], q=2-31, 400 kb/s, 25 fps, 1k tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.7.100 flv
  
      Stream #0:1(und): Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, 5.1, fltp, 96 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc57.7.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> flv1 (flv))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=   79 fps=0.0 q=10.7 size=     381kB time=00:00:03.43 bitrate= 908.7kbits/frame=  132 fps=0.0 q=10.1 Lsize=     548kB time=00:00:05.31 bitrate= 844.1kbits/s
  
  video:479kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.161623%
  
  [aac @ 0000021aa893eae0] Qavg: 177.292

  I then run the outputted video file and it runs just like the old one.

  I then concatenate the ouputted intro file with my main video file using the following command (tmp.txt contains the 2 files) :

  -f concat -i tmp.txt -c copy newvid.flv

  This produces the following output :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55.  4.100 / 55.  4.100
  
    libavcodec     57.  7.100 / 57.  7.100
  
    libavformat    57.  8.102 / 57.  8.102
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 12.100 /  6. 12.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, concat, from 'tmp.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 496 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 646x364, 400 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac (LC), 44100 Hz, 5.1, fltp, 96 kb/s
  
  [flv @ 00000257b5f0e180] Codec for stream 0 does not use global headers but container format requires global headers
  
  [flv @ 00000257b5f0e180] Codec for stream 1 does not use global headers but container format requires global headers
  
  Output #0, flv, to 'newvid.flv':
  
    Metadata:
  
      encoder         : Lavf57.8.102
  
      Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 646x364, q=2-31, 400 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, 5.1, 96 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [flv @ 00000257b56947e0] Packet mismatch 486539264 7424
  
  [flv @ 00000257b56947e0] Auto-inserting h264_mp4toannexb bitstream filter
  
  [flv @ 00000257b5f0e180] Non-monotonous DTS in output stream 0:0; previous: 5263, current: 5255; changing to 5263. This may result in incorrect timestamps in the output file.
  
  frame= 6359 fps=0.0 q=-1.0 size=   15906kB time=00:04:14.30 bitrate= 512.4kbits/frame= 9428 fps=0.0 q=-1.0 Lsize=   23835kB time=00:06:17.05 bitrate= 517.8kbits/s
  
  video:19016kB audio:4403kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.777447%

  When I try to run the final video (newvid.flv) it plays like this :

  It starts off playing the intro just fine.
  However, when the intro is finished the video freezes while the sound of the actual video continues for the entire duration of the video.

  Thus in conclusion what is lacking is the video of the second vid (the audio is fine).

  I’m new at using ffmpeg but I’ve tried my best to solve this, which is why I’m asking for your help.

  I’d certainly appreciate if someone could help me out.

• How can I efficient process a video on a per-request basis ?

  18 décembre 2015, par mipadi

  I’m working on a web application in which a watermark must be applied to a video before it is sent to the user. Currently this watermark is static, and is created using ffmpeg when a video is updated. However, the application is changing so that a unique watermark will be added to the video for every request made for the video. This prevents a problem, as the video files may be fairly large and adding a watermark may be time-consuming (e.g., in some cases it may take over a minute to add a watermark), but the watermarks cannot be added on upload.

  I figured that streaming video could be a solution and implemented a solution using the nginx-rtmp-module, but several problems cropped up :

  1. RTMP solutions are a no-go as they appear to require Flash. This application must be supported on devices that don’t support Flash at all, or don’t (and won’t) have it installed.
  2. I have considered using MPEG-DASH, but that enjoys only limited support. Namely, it is not supported on versions of Firefox targeted by the application, nor is it supported on iOS or some versions of Safari.
  3. I have considered HLS, but that enjoys even more limited support than MPEG-DASH.
  4. Regardless, I haven’t actually been able to get Dash.js (the reference player for MPEG-DASH streams) to work, although that may be due to an encoding issue, I’m not sure.

  I wondered if there is a better (perhaps simpler) solution to this problem ; perhaps streaming video isn’t the way to go at all ? Is there an efficient way to transcode a video file on-the-fly and start sending it to the browser quickly ?

  I am not against using solutions like node.js or other platforms/frameworks, and solutions can use HTML5 <video></video> if necessary.