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• Capture Thumbnail Whilte Downloading Youtube Video

  31 décembre 2012, par Minime

  I want to capture a thumbnail of Youtube video on certain timeline. (e.g. 3.2sec)
  I used ytdl and fluent-ffmpeg with node.js to implement it.
  It was possible to capture a thumbnail when the downloading has finished.

  var fs = require('fs');
  
  var ytdl = require('ytdl');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var videostream = fs.createWriteStream('video.flv');
  
  var myytdl = ytdl('http://www.youtube.com/watch?v=A02s8omM_hI');
  
  myytdl.pipe(videostream);
  
  videostream.on('close',function() {
  
    console.log('Downloading complete...');
  
    var proc = new ffmpeg({ source: 'video.flv', nolog: true })
  
    .withSize('150x100')
  
    .takeScreenshots(1, '/home/test', function(err) {
  
      console.log(err || 'Screenshots were saved');
  
    });
  
  });

  However, I couldn't implement to capture a thumbnail while downloading. Basic idea of what I want to do is as below.

  1. Download Youtube video starting at X sec. (Worked)
  2. Pipe it to Readable/Writable(Duplex) Memory Stream (Need Advise)
  3. During downloading, check if stream has enough data to capture the first frame, which is at X sec. (Need Advise)
  4. Capture the first frame, then stop downloading

  For 2, I've realized that node.js will have Duplex Stream on coming v0.9.x, but it seems not working properly. Anyone who has good idea to implement bullet 2,3 ?

• `ffmpeg` `delogo` filter leaving traces at the logo locations

  26 mars 2023, par nlblack323

  I'm using ffmpeg delogo filter to remove these logos

  


  using :

  


  ffmpeg -i vid.mp4 -vf "delogo=x=27:y=158:w=344:h=93, delogo=x=44:y=839:w=531:h=77" out.mp4


  


  but this results in large noticeable marks at both logo locations. Besides, the replaced parts are terribly blurry and barely close to the actual colors. Is there a way to prevent or improve these results ?

  


• Batch overlay logo to directory of video files with scale watermark in percentage of video resolution

  28 septembre 2017, par Aariyan mind

  help me how to add auto scale watermark in percentage of video resolution code in this ?

  for %%I in ("C:\Users\demo\*.mp4") do ffmpeg.exe -i "%%I"  -filter_complex "movie=180n.png[watermark];[watermark][0]scale2ref=350*iw/2140:42*iw/2140[wm][v];[wm]setsar=1[logo];[v][logo] overlay=10:10:enable=not(between'(t,30,210)')[watermark]" -map "[watermark]" -map 0:a -codec:v libx264 -codec:a copy "C:\Users\files\%%~nI.mp4"
  
  pause