Newest 'ffmpeg' Questions - Stack Overflow

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  • ffmpeg and ffplay for windows send CRLF inside double quote

    14 juin 2016, par uingtea

    I want to pass multiple headers for ffplay or ffmpeg, it say I need to split with CRLF. on linux I can use \ or $'\r\n' but how for windows?

    SET CRLF=^
ffplay -v debug -i "http://example.com/test" -headers "Accept-Language: en-US,en;q=0.5%CRLF%Connection: keep-alive"

    debug log: Connection: keep-alive is not sent

    [http @ 04df3f40] No trailing CRLF found in HTTP header.
[http @ 04df3f40] request: GET /test HTTP/1.1 0KB sq=    0B f=0/0
User-Agent: Lavf/57.37.101
Accept: */*
Range: bytes=0-
Connection: close
Host: example.com
Icy-MetaData: 1
Accept-Language: en-US,en;q=0.5

    thanks

  • Rails 4 App Video Uploading CarrierWave AWS & Heroku - ffmpeg : command not found

    14 juin 2016, par still_learning

    Have a basic Rails 4 App where users can register and then upload a video.

    Can't get app working in production on Heroku with CarrierWave and AWS.

    Whenever I try upload a video I get the following error:

    Errno::ENOENT (No such file or directory - the ffprobe binary could not be found in /app/vendor/bundle/ruby/2.2.0/bin:/app/bin:/app/vendor/bundle/bin:/usr/local/bin:/usr/bin:/bin):


    Used brew to install ffmpeg and ffmpeg2theora on my system.

    Then used the Heroku Buildpacks to add ffmpeg to my Heroku App.

    $ heroku buildpacks
    === serene-temple-75731 Buildpack URLs
    1. heroku/ruby
    2. https://github.com/shunjikonishi/heroku-buildpack-ffmpeg


    But when I run:

    $ heroku run "ffmpeg -version"
    Running ffmpeg -version on ⬢ serene-temple-75731... up, run.8863
    bash: ffmpeg: command not found

    How do I get round this issue?

    Gemfile.rb

    gem 'carrierwave'
gem 'carrierwave-video'
gem 'video_thumbnailer'
gem 'carrierwave-ffmpeg'
gem "fog"

    video_uploader.rb

    class VideoUploader < CarrierWave::Uploader::Base
  include CarrierWave::RMagick
  include CarrierWave::Video
  include CarrierWave::FFmpeg
  include VideoThumbnailer

  storage :file

  version :mp4 do  
    process encode_video: [:mp4, custom: '-ss 00:00:00.000 -t 00:00:17.000', preserve_aspect_ratio: :height]
    def full_filename for_file
      png_name for_file, version_name, "mp4"
    end
  end
end

    initializers/carrierwave.rb

    CarrierWave.configure do |config|

  # Use local storage if in development or test
  if Rails.env.development? || Rails.env.test?
    CarrierWave.configure do |config|
      config.storage = :file
    end
  end

  # Use AWS storage if in production
  if Rails.env.production?
    CarrierWave.configure do |config|
      config.storage = :fog
    end
  end

  config.fog_credentials = {
    :provider               => 'AWS',
    :aws_access_key_id      => 'ENV["AWS_ACCESS_KEY_ID"]',
    :aws_secret_access_key  => 'ENV["AWS_SECRET_ACCESS_KEY"]',
  }
  config.fog_directory  = 'ENV["S3_BUCKET_NAME"]'
  #config.fog_host       = 'https://assets.example.com'
  #config.fog_public     = false
  config.fog_attributes = {'Cache-Control'=>'max-age=315576000'}
end

    Any suggestions? If you want more code just ask.

  • Python - Playing a video with audio (with OpenCV ?)

    14 juin 2016, par hoothoot

    This is probably a stupid question, and I have searched for this but didn't find a straightforward answer:

    Can you play a video with audio using OpenCV and FFMPEG?

    If not, what is the best way to do this? It seems so simple but I'm so new to Python that I don't know what to expect/what to search for.

    Thank you!

  • FFMPEG rotates images

    13 juin 2016, par Jaketr00

    I am trying to mass-resize images using FFMPEG, and I successfully did it using bash, but I noticed that some of the portrait images got rotated to landscape. Here is the original image, but as you see below, it gets rotated.

    Rotated image

    As you see above, the image is rotated. At first, I thought this was due to the -vf scale flag that I was using to resize the images, but I tried the following command and it still rotated the image.

    ffmpeg -i input.jpg output.jpg

    This doesn't happen with every image, and even not all the portrait images. Also, some images rotate clockwise, while some rotate counter-clockwise. And this isn't a random occurrence, all the images that originally rotated still rotate no matter how many times I run the command.

    Console Output

    ffmpeg version N-79942-gdc34fa6-tessus Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --as=yasm --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
  libavutil      55. 23.100 / 55. 23.100
  libavcodec     57. 38.100 / 57. 38.100
  libavformat    57. 35.100 / 57. 35.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 44.100 /  6. 44.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, image2, from '/Users/jaketr00/Desktop/IMG_1902.JPG':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 1025494 kb/s
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 5184x3456, 25 tbr, 25 tbn
[image2 @ 0x7ff751803e00] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
Output #0, image2, to '/Users/jaketr00/Desktop/IMG_19022.JPG':
  Metadata:
    encoder         : Lavf57.35.100
    Stream #0:0: Video: mjpeg, yuvj422p(pc), 5184x3456, q=2-31, 200 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc57.38.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=8.2 size=N/A time=00:00:00.04 bitrate=N/A speed=0.0753x   frame=    1 fps=0.0 q=8.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.0752x    
video:554kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

    Is there any way to stop this from happening?

  • Proccess audio/video stream with opencv and export to audio/video stream

    13 juin 2016, par user3373406

    I need read a stream of audio/video and process the video with openCV.Then export the same stream with the video processed. All this need to be in real time. Of course you will have a delay for the processing with openCV. Thank.

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