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• How to set watermark resolution according to video resolution ?

  10 avril 2018, par Kiran

  Here i am trying to create a video editor with top and bottom text.I can set 2 text on top and bottom with different size, color and fonts for that text and i am converting that text to image and adding as watermark.

  But when resolution of video decreases the size of watermark image increase and vise versa.I am using ffmpeg commands.Now i am calculating like as shown below.

    if (video_width <= 300) {
  
  
  
                  Log.e("less than", "300");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width / 2 + 30) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height / 2 + 15));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width / 2 + 30) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height / 2 + 15));
  
  
  
              } else if (video_width > 300 && video_width <= 400) {
  
  
  
                  Log.e("less than", "400");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width / 2 + 130) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height / 2 + 70));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width / 2 + 130) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height / 2 + 70));
  
  
  
              } else if (video_width > 400 && video_width <= 600) {
  
                  Log.e("btw ", "400 and 600");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width + 80) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height + 40));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width + 80) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height + 40));
  
              } else if (video_width > 600 && video_width <= 1000) {
  
                  Log.e("btw ", "600 and 1000");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width + 100) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height + 100));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width + 100) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height + 100));
  
  
  
              } else if (video_width > 1000) {
  
                  Log.e("grthr than ", "1000");
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width * 2 + 20) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height * 2 + 20));
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width * 2 + 20) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height * 2 + 20));
  
  
  
              }

  This will not give accurate results.Can anyone suggest any other calculation methods.I have also tried with "drawtext" method .It also have same issue.

• how to add watermark in multiple areas using ffmpeg ?

  7 mars 2018, par kunal

  i am using laravel framework and also using ffmpeg php library. Actually i have done almost 70% of work. But the problem i faced is to show watermark at multiple areas on video. I have done the watermark on top-left corner that is running very fine on that video. But i want to add watermark in top-left, bottom-left, bottom-right. I have used this code for top-left watermark (for video) :-

  $inputVideo = public_path('input/airplane_flight_airport_panorama_1080.mp4');
  
  $outputVideo = public_path('uploads/output.mp4');
  
  $watermark = public_path('input/watermark.jpg');
  
  
  
  $wmarkvideo = "ffmpeg -i ".$inputVideo." -i ".$watermark." -filter_complex ". '"overlay=x=(main_w-overlay_w):y=(main_h-overlay_h)/(main_h-overlay_h)"'." ".$outputVideo;
  
  exec($wmarkvideo );

  Please help me how can i add watermark on top-left, bottom-left, bottom-right in these areas. Thanks in advance :)

• FFMPEG to add watermark over video C# WPF Application

  7 mars 2018, par Viakode

  I am able to merge PNG and Video now, but what happeming is, the quality of PNG is downgrading a lot.

  Is there any way not to loose png and video quality after execution.

  I tried this :

  public void AddWaterMark(string orginalVideoPath, string waterMarkPath, string outPutVideoPath)
  
          {
  
              string ffmpeg = System.AppDomain.CurrentDomain.BaseDirectory + @"\Tools\\ffmpeg.exe";
  
  
  
              System.Diagnostics.Process ffmpegProcess = new System.Diagnostics.Process();
  
  
  
              System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
  
  
  
              startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
  
  
  
                          startInfo.Arguments = " -y -i " + orginalVideoPath + " -i " + waterMarkPath + " -filter_complex \"[1][0]scale2ref[i][m];[m][i] overlay[v]\" -map \"[v]\" -map 0:a? -ac 2" + outPutVideoPath;
  
  
  
              try
  
              {
  
                  System.Diagnostics.Process.Start(startInfo).WaitForExit();
  
              }
  
              catch (Exception err)
  
              {
  
                  MessageBox.Show(err.Message);
  
              }
  
          }

  Thanks