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• ffmpeg auto crop black frame and watermark

  4 juin 2018, par rbarab

  We are processing short videos. Most of them are 640x480, recorded by mobile. Many of them have a black frame on left and right.
  I would like to watermark the videos and currently using this command.

  ffmpeg -i IN.mp4 -i WATERMARK.png -filter_complex "overlay=main_w-overlay_w-10:main_h-overlay_h-10" OUT.mp4

  The problem is that if there is a frame, part of the watermark goes on the frame and only a part is on the actual content. Would like to place the watermark on the bottom right of the actual content.

  Are any of these possible, or any other ideas ?

  a, Dynamically detect the black frames and adjust the watermark position accordingly.

  b, Crop the black frame and watermark the content correctly in the same step.

  Thanks a lot for your help !

• ffmpeg frame accurate seek with minimum delay

  11 avril 2019, par Jumper1

  I have a project where I need to extract part of a video near the end of video files and it needs to be frame accurate. I can extract my segment frame accurately now using ’-vf’ filter command and it works very well. The only problem is for large high-resolution files, the seek time ends up being 10X the time required for the extraction/encoding part. Is there any other or faster way to extract videos frame accurately ?

  The working command that I am currently using is below :

  ffmpeg -i 'test_input.mp4' -vf 'trim=start_frame=134037:end_frame=135024,setpts=PTS-STARTPTS' -an -c:v libx264 -preset slow -f mp4 'test_output.mp4' -y 2>&1

• Node.JS : FFmpeg piped video encoding no thumbnail created

  12 avril 2013, par Sascha Heim

  I want to pipe the video during upload to ffmpeg for realtime thumbnail creation.
  All went fine but no thumbnail.jpg was created and the ffmpeg stderr hangs after the libraries version display.

  Updated : Ive updated my code but it also doesnt create a valid thumbnail.

  var formidable = require('formidable'),
  
          http = require('http'),
  
          sys = require('sys'),
  
          spawn = require('child_process').spawn;
  
  
  
  function spawnFfmpeg(exitCallback) {
  
      var args = ['-i', 'pipe:0', '-c:v', 'mjpeg', '-ss', '00:00:13', '-vframes', '1', '-s', '100x80', 'thumbnail.jpg']
  
      var ffmpeg = spawn('ffmpeg', args);
  
      console.log('Spawning ffmpeg ' + args.join(' '));
  
  
  
      ffmpeg.on('exit', exitCallback);
  
      ffmpeg.stderr.on('data', function(data) {
  
          console.log('grep stderr: ' + data);
  
      });
  
      return ffmpeg;
  
  }
  
  
  
  http.createServer(function(req, res) {
  
      if (req.url == '/' && req.method.toLowerCase() == 'get') {
  
          // show a file upload form
  
          res.writeHead(200, {'content-type': 'text/html'});
  
          res.end
  
                  (&#39;<form action="/upload" enctype="multipart/form-data" method="post">&#39;
  
                          + &#39;<input type="text" /><br />&#39;
  
                          + &#39;<input type="file" multiple="multiple" /><br />&#39;
  
                          + &#39;<input type="submit" value="Upload" />&#39;
  
                          + &#39;</form>&#39;
  
                          );
  
      } else if (req.url == &#39;/upload&#39; &amp;&amp; req.method.toLowerCase() == &#39;post&#39;) {
  
          // parse a file upload
  
          var form = new formidable.IncomingForm();
  
          form.maxFieldsSize = 29 * 1024 * 1024;
  
          // Handle each part of the multi-part post
  
          var ffmpeg = spawnFfmpeg(function(code) {
  
              console.log(&#39;child process exited with code &#39; + code);
  
              res.end();
  
          });
  
  
  
          var form = new formidable.IncomingForm();
  
          // Handle each part of the multi-part post
  
          form.onPart = function(part) {
  
              // Handle each data chunk as data streams in
  
              part.addListener(&#39;data&#39;, function(data) {
  
                  ffmpeg.stdout.pipe(res);
  
                  res.pipe(ffmpeg.stdin);
  
                  // Write each chunk to disk
  
                  //savedFile.write(data);
  
              });
  
          };
  
  
  
          // Do it
  
          form.parse(req);
  
          return;
  
      }
  
  }).listen(80, "127.0.0.1");
  
  
  
  process.on(&#39;uncaughtException&#39;, function(err) {
  
  });