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• C# capture specific frame from video file using ffmpeg takes too long

  6 septembre 2018, par Ditza

  I am trying to take specific frame from full HD video file. I am using Accord.Video.FFMPEG.
  The read ReadVideoFrame takes something like 200ms. I need It to be much faster.
  Am I doing something wrong or this is the time it should takes ? What should I use to get the frame in few milliseconds ?

  VideoFileReader reader = new VideoFileReader();
  
  reader.Open(source);
  
  int frameN = (int)Math.Floor(((reader.FrameRate).ToDouble() * pos.Milliseconds) / 1000);
  
  Bitmap bkg = reader.ReadVideoFrame(frameN);

  Thanks,
  Ditza

• FFMPEG join multiple video lost audio

  23 août 2018, par Ankur Tripathi

  I am trying to join 2-3 videos it’s working when all video has audio or without audio...

  Command= "-f concat -i files.txt -codec copy output.mp4"

  File.txt

  file ’0.mp4’

  file ’1.mp4’

  file ’2.mp4’

  Now the issue is when 0.mp4 is without audio and 1.mp4 is with audio and when i join these videos full audio lost in output.. output will be without audio.

  I want this join with all as it is like if 0.mp4 without audio then audio will not play for this and 1.mp4 play audio should play...

• Video Failed to transcode with FFmpeg with Rails app in my localhost

  25 avril 2017, par Takor

  I ve tried to upload videos using Carrierwave-video & FFmpeg. I’ve installed FFmpeg and there is no problem with installation. I have made configurations from ’ http://blog.41studio.com/upload-videos-using-carrierwave-ffmpeg/ ’ .But when I tried to upload video (.mov file), I have an error.

  Error

   Video Failed to transcode with FFmpeg. Check ffmpeg install and verify video is not corrupt or cut short. Original error: Failed encoding.Errors: encoded file is invalid. Full output: ffmpeg version 2.8.3 Copyright (c) 2000-2015 the FFmpeg developers built with Apple LLVM version 7.0.0 (clang-700.1.76) configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-libfaac --enable-nonfree --enable-vda libavutil 54. 31.100 / 54. 31.100 libavcodec 56. 60.100 / 56. 60.100 libavformat 56. 40.101 / 56. 40.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 40.101 / 5. 40.101 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/tanerkoroglu/Desktop/Wishpere2/public/uploads/tmp/1449435556-7186-2107/IMG_1756.MOV': Metadata: major_brand : qt minor_version : 0 compatible_brands: qt creation_time : 2015-10-17 12:19:27 Duration: 00:01:04.24, start: 0.000000, bitrate: 17176 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 17082 kb/s, 29.98 fps, 29.97 tbr, 600 tbn, 1200 tbc (default) Metadata: creation_time : 2015-10-17 12:19:27 handler_name : Core Media Data Handler encoder : H.264 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 85 kb/s (default) Metadata: creation_time : 2015-10-17 12:19:27 handler_name : Core Media Data Handler Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default) Metadata: creation_time : 2015-10-17 12:19:27 handler_name : Core Media Data Handler Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default) Metadata: creation_time : 2015-10-17 12:19:27 handler_name : Core Media Data Handler Please use -q:a or -q:v, -qscale is ambiguous [Parsed_movie_0 @ 0x7feb6bf00100] Failed to avformat_open_input '/Users/tanerkoroglu/Desktop/Wishpere2/app/assets/images/logo.png' [AVFilterGraph @ 0x7feb6bc09240] Error initializing filter 'movie' with args '/Users/tanerkoroglu/Desktop/Wishpere2/app/assets/images/logo.png' Error opening filters! 

  video_uploader.rb

  class VideoUploader < CarrierWave::Uploader::Base  
  
      include CarrierWave::Video
  
      process :encode
  
       def encode
  
         encode_video(:mp4, watermark: {path: File.join(Rails.root, "app/assets/images/logo.png")})
  
       end
  
  
  
     version :mp4 do
  
       def full_filename(for_file)
  
          super.chomp(File.extname(super)) + '.mp4'
  
       end
  
     end
  
   end 

  Gemfile

   gem 'carrierwave',             '0.10.0'
  
   gem 'carrierwave-video' 
  
   gem 'streamio-ffmpeg'