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• No such file or directory Error with FFMPEG screenshot and CarrierWave custom model method

  9 juillet 2013, par dodgerogers747

  I am using AWS CORS to upload videos to my site, all of which works as planned.

  I have the following model method which runs as an after_create callback (for speed) to take a screenshot from the video file on AWS. I plan to move this out into a delayed job but I don't think this will solve this particular issue. Please advise if mistaken.

  I use FFMPEG to take a screenshot from the AWS self.file location, I then send the file to CarrierWave by saving the file to self.screenshot where it is uploaded to AWS.

  Approx. 50% of the time it errors out with Errno::ENOENT - No such file or directory for the location of the screenshot image.

  How can I rectify my code to remove this error and how come it only occurs around 50% of the time ? If anyone needs more code just shout.

  video.rb

  after_create :take_screenshot
  
  
  
  mount_uploader :screenshot, ImageUploader
  
  
  
    def take_screenshot
  
      location = "#{Rails.root}/public/uploads/tmp/screenshots/#{unique}_#{File.basename(file)}.jpg"
  
      system `ffmpeg #{log_level} -i #{self.file} -ss 00:00:0#{time_frame} -vframes 1 #{location}`
  
      logger.debug "Trying to take screenshot from #{self.file}"
  
      #pass the actual file to CarrierWave to handle the image upload
  
      self.screenshot = File.open(location)
  
      self.save
  
      logger.debug "Deleting tmp file: #{location}: #{File.delete(location)}" if self.screenshot.present?
  
    end
  
  
  
  def unique
  
      (0..6).map{(65+rand(26)).chr}.join
  
    end
  
  
  
  def log_level
  
      "-loglevel panic"
  
    end
  
  
  
    def time_frame
  
      rand(0..3)
  
    end

  Stack trace :

  Started POST "/videos" for 127.0.0.1 at 2013-07-10 03:58:49 +0800
  
  Processing by VideosController#create as JS
  
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"6M1Ia+Ag2E3HVKH2PO/p7jewxSpMPdWeVHGA933Bzjw=", "video"=>{"file"=>"http://bucketname.s3.amazonaws.com/uploads/video/file/671a87fb-91de-4eaf-a38a-1b25c51798e5/Good_7iron.m4v"}}
  
    User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 9 LIMIT 1
  
     (0.1ms)  BEGIN
  
    SQL (0.2ms)  INSERT INTO `videos` (`created_at`, `file`, `question_id`, `screenshot`, `updated_at`, `user_id`) VALUES ('2013-07-09 19:58:49', 'http://bucketname.s3.amazonaws.com/uploads/video/file/671a87fb-91de-4eaf-a38a-1b25c51798e5/Good_7iron.m4v', NULL, NULL, '2013-07-09 19:58:49', 9)
  
  Trying to take screenshot from http://bucketname.s3.amazonaws.com/uploads/video/file/671a87fb-91de-4eaf-a38a-1b25c51798e5/Good_7iron.m4v
  
     (0.8ms)  ROLLBACK
  
  Completed 500 Internal Server Error in 3550ms
  
  
  
  Errno::ENOENT - No such file or directory - /Users/me/rails/project/public/uploads/tmp/screenshots/WCACLIC_Good_7iron.m4v.jpg:
  
    app/models/video.rb:24:in `initialize'
  
    app/models/video.rb:24:in `open'
  
    app/models/video.rb:24:in `take_screenshot'

• How to ask QtCreator to use a custom build library on user path instead of using system library

  23 février 2018, par shang12

  My Ubuntu has ffmpeg library in /usr/lib/x86_64-linux-gnu. I also rebuild ffmpeg from source and install it into my home directory.
  In project file, I have added following lines :

  TARGET = testFFmpeg
  
  INCLUDEPATH += /home/kiet/ffmpeg/include
  
  LIBS += -L/home/kiet/ffmpeg/lib/ -lavcodec -lavformat -lavutil -lswscale

  I build my project successfully. But my binary file still links to ffmpeg in /usr/lib/x86_64-linux-gnu

  ldd testFFmpeg | grep libav
  
  
  
  libavcodec-ffmpeg.so.56 => /usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56 (0x00007f9085ce7000)
  
  libavformat-ffmpeg.so.56 => /usr/lib/x86_64-linux-gnu/libavformat-ffmpeg.so.56 (0x00007f90858e9000)
  
  libavutil-ffmpeg.so.54 => /usr/lib/x86_64-linux-gnu/libavutil-ffmpeg.so.54 (0x00007f908567a000)

  How can I ask qmake to find library in my folder first ?

• How to add custom configure option with VCPKG when building FFMPEG ?

  1er novembre 2024, par NickWuzh

  Does anyone know how to enable x11grab format in FFMPEG with VCPKG ?

  


  I'm building FFMPEG in vcpkg manifest mode. Here is my vcpkg.json :

  


  {
  "name": "project",
  "version": "1.0.0",
  "dependencies": [
    {
      "name": "ffmpeg",
      "features": [
        "avcodec",
        "avdevice",
        "avfilter",
        "avformat",
        "bzip2",
        "ffmpeg",
        "lzma",
        "postproc",
        "swresample",
        "swscale",
        "x264",
        "zlib"
      ]
    },
    "iniparser",
    "jsoncpp",
    "spdlog"
  ]
}



  


  And I want to enable x11grab configuration in order to capture screen in Linux, but I found no feature was adapted.
Soon I found that —enable-libxcb was needed in configure and it was autodetect. So I build and install libxcb with source. And pkg-config can find it :

  


  $ pkg-config --modversion xcb
1.17.0


  


  But it doesn't work because in default it is —disable-autodetect in $VCPKG_ROOT/ports/ffmpeg/portfile.cmake :

  


  set(OPTIONS "--enable-pic --disable-doc --enable-debug --enable-runtime-cpudetect --disable-autodetect")


  


  I try to modify $VCPKG_ROOT/ports/ffmpeg/portfile.cmake —enalbe-autodetect, but it doesn't work either. Here is the short message when appling vcpkg install --triplet x64-linux-release

  


  -- Using source at /usr/local/src/cpp/third-party/vcpkg/buildtrees/ffmpeg/src/n7.0.2-8cb3114be3.clean
-- Getting CMake variables for x64-linux-release
-- Building Options: --enable-pic --disable-doc --enable-debug --enable-runtime-cpudetect --disable-autodetect --target-os=linux --enable-pthreads --cc=gcc --host_cc=gcc --cxx=g++ --nm=nm --ar='ar' --ranlib=ranlib --strip=strip --enable-gpl --enable-ffmpeg --disable-ffplay --disable-ffprobe --enable-avcodec --enable-avdevice --enable-avformat --enable-avfilter --enable-postproc --enable-swresample --enable-swscale --disable-alsa --disable-amf --disable-libaom --disable-libass --disable-avisynth --enable-bzlib --disable-libdav1d --disable-libfdk-aac --disable-libfontconfig --disable-libharfbuzz --disable-libfreetype --disable-libfribidi --disable-iconv --disable-libilbc --enable-lzma --disable-libmp3lame --disable-libmodplug --disable-cuda --disable-nvenc --disable-nvdec  --disable-cuvid --disable-ffnvcodec --disable-opencl --disable-opengl --disable-libopenh264 --disable-libopenjpeg --disable-libopenmpt --disable-openssl --disable-libopus --enable-sdl2 --disable-libsnappy --disable-libsoxr --disable-libspeex --disable-libssh --disable-libtensorflow --disable-libtesseract --disable-libtheora --disable-libvorbis --disable-libvpx --disable-libwebp --enable-libx264 --disable-libx265 --disable-libxml2 --enable-zlib --disable-libsrt --disable-libmfx --enable-cross-compile --pkg-config="/bin/pkg-config" --pkg-config-flags=--static
-- Building Release Options: --enable-optimizations --extra-ldflags=-L"/usr/local/src/cpp/cmq/build/vcpkg_installed/x64-linux-release/lib"
-- Building ffmpeg for Release


  


  $ ffmpeg -devices
ffmpeg version 7.0.2 Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 14.2.0 (GCC)
  configuration: --prefix=/usr/local/src/cpp/third-party/vcpkg/packages/ffmpeg_x64-linux-release --enable-pic --disable-doc --enable-debug --enable-runtime-cpudetect --disable-autodetect --target-os=linux --enable-pthreads --cc=gcc --host_cc=gcc --cxx=g++ --nm=nm --ar=ar --ranlib=ranlib --strip=strip --enable-gpl --enable-ffmpeg --disable-ffplay --disable-ffprobe --enable-avcodec --enable-avdevice --enable-avformat --enable-avfilter --enable-postproc --enable-swresample --enable-swscale --disable-alsa --disable-amf --disable-libaom --disable-libass --disable-avisynth --enable-bzlib --disable-libdav1d --disable-libfdk-aac --disable-libfontconfig --disable-libharfbuzz --disable-libfreetype --disable-libfribidi --disable-iconv --disable-libilbc --enable-lzma --disable-libmp3lame --disable-libmodplug --disable-cuda --disable-nvenc --disable-nvdec --disable-cuvid --disable-ffnvcodec --disable-opencl --disable-opengl --disable-libopenh264 --disable-libopenjpeg --disable-libopenmpt --disable-openssl --disable-libopus --disable-sdl2 --disable-libsnappy --disable-libsoxr --disable-libspeex --disable-libssh --disable-libtensorflow --disable-libtesseract --disable-libtheora --disable-libvorbis --disable-libvpx --disable-libwebp --enable-libx264 --disable-libx265 --disable-libxml2 --enable-zlib --disable-libsrt --disable-libmfx --enable-cross-compile --pkg-config=/bin/pkg-config --pkg-config-flags=--static --enable-optimizations --extra-ldflags=-L/usr/local/src/cpp/cmq/vcpkg_installed/x64-linux-release/lib --arch=x86_64 --enable-asm --enable-x86asm
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 ---
 D  lavfi           Libavfilter virtual input device
 DE oss             OSS (Open Sound System) playback