Recherche avancée

Sur d’autres sites (7073)

• How to scale an overlay on a video

  8 mars 2019, par Mahesh Verma

  What I am trying to do :

  How can I add an overlay image to a video that scales from frame A to frame B within time T.

  What I have achieved :

  I am able to add overlay like this :

  -filter_complex "[0:v][1:v] overlay=$X:$Y:enable='between(t,$START_TIME,$STOP_TIME)'"

  Where I am stuck :

  How can I add scaling here in this filter ?

  

• avcodec_encode_video2() error -1 : Could not encode video packet - javacv

  7 mars 2016, par 404error

  I want to create a video (mp4) from a set of images and want to add a background sound to it. The background sound can either be recorded or a file may be browsed using a content chooser in android.
  The following code creates the video when a new audio is recorded in 3gp format. However when i browse an audio file (mp3 for example), it shows this error and the video recorded cannot be played.

  the error shown is :

  org.bytedeco.javacv.FrameRecorder$Exception: avcodec_encode_video2() error -1: Could not encode video packet. :at video_settings$Generate.doInBackground(video_settings.java:298)

  the code at video_settings.java:298 is

                      recorder.record(frame2);

  relevant code is :

  protected Void doInBackground(Void... arg0) {
  
  
  
  
  
          try {
  
              FrameGrabber grabber1 = new FFmpegFrameGrabber(paths.get(0));
  
              FrameGrabber grabber2 = new FFmpegFrameGrabber(backgroundSoundPath);
  
              Log.d("hgbj", backgroundSoundPath);
  
              grabber1.start();
  
              grabber2.start();
  
  
  
              FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(video, 320,
  
                      240, grabber2.getAudioChannels());// 320, 240
  
              recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4);//
  
              recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);
  
              recorder.setFormat("mp4");
  
              recorder.setFrameRate(2);
  
              recorder.setVideoBitrate(10 * 1024 * 1024);
  
  
  
              recorder.start();
  
              Frame frame1, frame2;
  
              long timeLength = grabber2.getLengthInTime();
  
              System.out.println("total time = " + timeLength);
  
  
  
  
  
              for (int i = 0; i < paths.size(); i++) {
  
                  // record this frame and then record (numFrames*percentageTime[i]/100) number of frames of the audio.
  
                  frame1 = grabber1.grabFrame();
  
                  long startTime = System.currentTimeMillis();
  
                  recorder.setTimestamp(startTime * 1000);
  
                  recorder.record(frame1);
  
                  boolean first = true;
  
                  // while current time - start time < percentage time * total time / 100: record frame2
  
                  long temp = timeLength * percentageTime[i] / 100000 + startTime;
  
                  while (System.currentTimeMillis() <= temp) {
  
                      frame2 = grabber2.grabFrame();
  
                      if (frame2 == null) break;
  
                      if (first) {
  
                          recorder.setTimestamp(startTime * 1000);
  
                          first = false;
  
                      }
  
                      recorder.record(frame2);
  
                  }
  
                  if (i < paths.size() - 1) {
  
                      grabber1.stop();
  
                      grabber1 = new FFmpegFrameGrabber(paths.get(i + 1));
  
                      grabber1.start();
  
                  }
  
              }

  My question is : if its working for 3gp recorded files why isn’t it working for browsed mp3 files and what should I do to make it work ?
  I have tried changing the codecs, frame height width, video bitrate but dont know any way to determine what bitrate etc is compatible with a given codec/format.
  I am changing the content uri obtained from file browser into the real path so that’s not the issue.

• FFMPEG show encoding progress

  18 janvier 2016, par Mick Jack

  I am using ffmpeg to convert a video file large files take a long time to get encode. i will like to show a progress bar with a percentage/time remaining

  i saw and tried this example example but progress bar is not showing

  FFMPEG script and autorefresh both in upload.php

      <?php
  
  shell_exec("C:\\ffmpeg\\bin\\ffmpeg.exe -y -i ".$target_file." -c:v libx264 -s:v 854x480 -c:a copy \"{$newFileName}\" > logfile.txt 2>&1");
  
  
  
           ?>
  
  
  
          <code class="echappe-js">&lt;script src=&quot;https://code.jquery.com/jquery-2.1.1.min.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt;
          
  &lt;script&gt;<br />
  
          $(document).ready(function(){<br />
  
          setInterval(function(){<br />
  
          $(&quot;#screen&quot;).load('progress.php')<br />
  
          }, 10000);<br />
  
          });<br />
  
          &lt;/script&gt;
  
  

  Progress.php

  <?php
  
  
  
  $content = @file_get_contents('logfile.txt');
  
  
  
              if($content){
  
              //get duration of source
  
              preg_match("/Duration: (.*?), start:/", $content, $matches);
  
  
  
              $rawDuration = $matches[1];
  
  
  
              //rawDuration is in 00:00:00.00 format. This converts it to seconds.
  
              $ar = array_reverse(explode(":", $rawDuration));
  
              $duration = floatval($ar[0]);
  
              if (!empty($ar[1])) $duration += intval($ar[1]) * 60;
  
              if (!empty($ar[2])) $duration += intval($ar[2]) * 60 * 60;
  
  
  
              //get the time in the file that is already encoded
  
              preg_match_all("/time=(.*?) bitrate/", $content, $matches);
  
  
  
              $rawTime = array_pop($matches);
  
  
  
              //this is needed if there is more than one match
  
              if (is_array($rawTime)){$rawTime = array_pop($rawTime);}
  
  
  
              //rawTime is in 00:00:00.00 format. This converts it to seconds.
  
              $ar = array_reverse(explode(":", $rawTime));
  
              $time = floatval($ar[0]);
  
              if (!empty($ar[1])) $time += intval($ar[1]) * 60;
  
              if (!empty($ar[2])) $time += intval($ar[2]) * 60 * 60;
  
  
  
              //calculate the progress
  
              $progress = round(($time/$duration) * 100);
  
  
  
              echo "Duration: " . $duration . "<br />";
  
              echo "Current Time: " . $time . "<br />";
  
              echo "Progress: " . $progress . "%";
  
  
  
  }
  
  
  
  ?>

  ffmpeg

   shell_exec("C:\\ffmpeg\\bin\\ffmpeg.exe -y -i ".$target_file." -c:v libx264 -s:v 854x480 -c:a copy \"{$newFileName}\" > logfile.txt 2>&1");