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• Video upload with carrierwave-video on Rails 4

  15 juin 2017, par MJRLGUE

  it’s been a while I am fighting to play a video in my rails app.

  I am using carrierwave-video, OS : Windows 10 64bits, to stream/show a video in user posts.

  Here is what I did :

  the file video_uploader.rb :

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
    include CarrierWave::Video
  
    storage :file
  
    def store_dir
  
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
  end

  in the file : _post.html.erb :

  with this line of code : <%= video_tag post.video_url :controls =>true %> I get a blank box with the size of the video.
  and I tried this too and still doesn’t work : <%= video_tag post.video.url if post.video? %>

  I tried ffmpeg too, I installed ffmpeg in my pc and I did include : process encode_video: [:mp4, callbacks: { after_transcode: :set_success } ] in video_uploader.rb file and I get this form error message :

  Video Failed to transcode with FFmpeg. Check ffmpeg install and verify
  video is not corrupt or cut short. Original error : ArgumentError

  Any suggestions please ?

• ffmpeg4android : overlay a video on video with opacity

  21 juin 2016, par LuongTruong

  I am using ffmpeg4android to edit video. Now, I am able to overlay a video on a video by using this command :

  String[] complexCommand = {"ffmpeg","-y" ,"-i", "/sdcard/videokit/in_big.mp4","-strict","experimental", "-vf", "movie=/sdcard/videokit/in_small.mp4 [watermark]; [in][watermark] overlay=main_w-overlay_w-0:0 [out]","-s", "320x240","-r", "30", "-b", "15496k", "-vcodec", "mpeg4","-ab", "48000", "-ac", "2", "-ar", "22050", "/sdcard/videokit/out.mp4"};

  Now, I want to change the opacity of the video "in_small.mp4" which will be on the top of another video.

  Some useful links :
  using ffmpeg to add overlay with opacity
  ffmpeg overlay video with semi transparent video
  

  From those links, I know that all_opacity should be the keyword in this case, but I do not know where to put it in the command.

  Please let me know if you have any ideas. Any suggestion would be appreciated !

• Save live video stream to a video file

  29 juin 2023, par VISHAL DAGA

  Trying to save live streaming video data into a (any) playable video file.
When I log the data I see the following (Put in comment in below code) :-

  


  axios.get(`http://192.168.1.33`, {&#xA;  responseType: &#x27;stream&#x27;,&#xA;}).then((response)=>{&#xA;  const stream = response.data&#xA;  stream.on(&#x27;data&#x27;, data => {&#xA;    console.log(data);  // <buffer 4c="4c" 28="28" a1="a1" 0c="0c" 0d="0d" 14="14" 0e="0e" e1="e1" 8e="8e" eb="eb" 52="52" 48="48" d0="d0" c0="c0" 4a="4a" 68="68" 7b="7b" 0b="0b" c7="c7" 7c="7c" d2="d2" 55="55" 21="21" 0a="0a" a9="a9" 63="63" 12="12" 96="96" 9b="9b" 00="00" ed="ed" 49="49" 42="42" 1a="1a" 16="16" a4="a4" 1e="1e" 94="94" 50="50" 20="20" a3="a3" d8="d8" d5="d5" 1386="1386" more="more" bytes="bytes">&#xA;                       // <buffer 0d="0d" cb="cb" 4b="4b" f7="f7" 77="77" 36="36" c8="c8" 42="42" 9d="9d" bb="bb" b3="b3" d6="d6" a3="a3" 72="72" 24="24" ff="ff" 00="00" 9e="9e" 29="29" b8="b8" 35="35" a5="a5" 48="48" ad="ad" e2="e2" 11="11" a9="a9" ec="ec" 38="38" 1d="1d" e1="e1" 91="91" 93="93" 73="73" bf="bf" a6="a6" 96="96" 62="62" 26="26" 57="57" f4="f4" a4="a4" 4258="4258" more="more" bytes="bytes">&#xA;                      // ....&#xA;</buffer></buffer>

  


  How can I save this data into a video file which can be played ? I am starting to read from live stream at a certain point in time and reading it for few seconds - ex. 5 seconds. I need to have a video of that 5 seconds.

  


  Note, when I use the url : http://192.168.1.33, I can see the video on the browser.