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• Black overlay appears when merging a transparent video to another video

  13 juin 2012, par RakeshS

  This is what I have done so far :

  Command to create a transparent PNG image :

  convert -size 640x480 -background transparent -fill blue \
  
  -gravity South label:ROCK image1-0.png

  Command to create a transparent video :

  ffmpeg -loop 1 -f image2 -i image1-0.png -r 20 -vframes 100 \
  
  -vcodec png -pix_fmt bgra mov-1.mov

  (as per this post) - I expect this video to be a transparent video.

  Command to overlay a video with another :

  ffmpeg -i final-video.mov -sameq -ar 44100 \
  
  -vf "movie=mov-1.mov [logo];[in][logo] overlay=0:0 [out]" \
  
  -strict experimental final-video.mov

  Above commands works perfect and I have not faced any problem, but I don't get what I expect which is kinda watermarking effect, I want mov-1.mov to be transparent with final-video.mov.

  Questions :

  1. Is there any way to verify if the generated video is transparent ? other than merging ?
  2. Not sure why the above mov-1.mov is not transparent when it is merged with final-video.mov, any info to solve this problem would be great.

  Please help.

• FFMPEG - create video in with images and video file

  15 novembre 2018, par Pramod Gehlot

  I am creating video using ffmpeg
  I have some images and video so i want to create video with images and also video
  in node js

  my code

   ffmpeg()  .addInput(__dirname + '/test/fixtures/step_%1d.png')
  
   // .outputOptions(['[0:v]scale=200x200'])
  
  
  
   .complexFilter([
  
       // 'scale=640:480[rescaled]',
  
  
  
       {
  
           filter: 'zoompan',
  
           options: {
  
              x: '200',
  
               y: 'ih/2-(ih/zoom/2)',
  
               z: 'min(zoom+0.0005,1.5)',
  
              d: '125',
  
               s: "200x200",
  
  
  
           },
  
           // "inputs":'[0:v]scale=200x200'
  
       },
  
   ])
  
  
  
   .format('mp4')
  
   .videoBitrate('1024k')
  
   .videoCodec('mpeg4')
  
   .output(finalVideoPath)
  
   .on("error", function (er) {
  
       console.log("error occured: " + er.message);
  
   })
  
   .on('end', function () {
  
       console.log('Finished processing');
  
   }).run();

  I want to add video , how we can do in this code, Please help me

• WebM Video Codec in Skype 5.0 Group Video

  9 novembre 2010, par noreply@blogger.com (John Luther)

  Our friends at Skype recently released Skype 5.0 for Windows and Mac, which features a beta group video feature using VP8, the video codec in WebM. In the first half of 2010, approximately 40% of Skype-to-Skype calls were video calls and we’re excited that in the future many of those calls will be made using VP8.

  To check out the new group video feature, simply download the Skype Software.

  Note : For group video to work, everyone on the call needs the new Skype for Windows or Mac, a webcam and a broadband connection.

  For more info about Skype group video, visit the Skype website.