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• Android javacv FFMpeg overlay animated gif over video

  5 avril 2019, par Diego Perez

  I’m developing an Android app that creates a video (from an image plus an mp3 file) with javacv and FFMpeg and the video generation part is working fine, but my problem comes now that I would like to overlap a transparent background animated gif over the video, and I’m really stuck with it and I have no success on every attempt so far.

  To be honest it is being my first experience with javacv and FFMpeg, so I have little knowledge on how to work with filters.

  I’ll paste my complete video creation method below and let’s see if anyone can help me. Again, my problem is overlapping the animated gif, the video (removing the filter part) is being created just fine. The most I was able to achieve is overlapping a static (one frame) small gif (with no transparency) on the top left corner of video, but what I’d like to achieve is a transparent gif with the same dimensions of video over it.

  Maybe you will see nonsense code, but remember this is due to my lack of knowledge with javacv and FFMpeg filters.

  I hope anyone can help me.

  Thanks.

  PS. I have read this post : javaCV Android, Strange colors on overlay while streaming to rtmp server

  of @schw4ndi but I wasn’t able to do anything with it.

  static String recordVideo(JSONObject objJSON) {
  
  
  
      try {
  
          fileName = objJSON.has("file_name") ? String.valueOf(objJSON.getString("file_name")) : "";
  
          videoPath = objJSON.has("video_path") ? String.valueOf(objJSON.getString("video_path")) : "";
  
      } catch (JSONException e) {
  
          ExceptionHandler.logException(e);
  
      }
  
  
  
      String strReturn = Enum.Result.OK;
  
  
  
      if (!fileName.equals("") && !videoPath.equals("")) {
  
          try {
  
              String outputFilename = videoPath + "/" + fileName;
  
              //video grabber
  
              FrameGrabber grabber1 = new FFmpegFrameGrabber(outputFilename + ".jpg");
  
              //audio grabber
  
              FrameGrabber grabber2 = new FFmpegFrameGrabber(outputFilename + ".mp3");
  
  
  
              grabber1.start();
  
              grabber2.start();
  
  
  
              FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFilename + ".mp4", 1080, 1920,2);
  
  
  
              //video
  
              recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
  
              recorder.setVideoOption("tune", "zerolatency");
  
              recorder.setFrameRate(30);
  
              recorder.setVideoBitrate(128000);
  
              recorder.setVideoOption("crf", "28");
  
              recorder.setVideoQuality(0); //highest quality
  
              recorder.setVideoOption("preset", "fast");
  
              recorder.setFormat("mp4");
  
  
  
              //audio
  
              recorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);
  
              recorder.setSampleRate(44100);
  
              recorder.setAudioBitrate(128000);
  
              recorder.setAudioOption("crf", "0"); //no variable bitrate audio (constant rate factor)
  
              recorder.setAudioQuality(0); //highest quality
  
  
  
              FFmpegFrameFilter filter = null;
  
              try{
  
                  filter = new FFmpegFrameFilter("movie=" + videoPath + "/anim01.gif [logo];[in][logo]overlay=0:0:format=yuv420 [out]",1080, 1920);
  
                  filter.start();
  
              }catch (FrameFilter.Exception e){
  
                  e.printStackTrace();
  
              }
  
  
  
              recorder.start();
  
  
  
              Frame frame1, frame2 = null, frame3 = null;
  
  
  
              while ((frame1 = grabber1.grabFrame()) != null ||
  
                      (frame2 = grabber2.grabFrame()) != null) {
  
                  if (frame1 != null) filter.push(frame1);
  
                  frame3 = filter.pull();
  
                  //recorder.record(frame1);
  
                  recorder.record(frame3, avutil.AV_PIX_FMT_YUV420P);
  
                  recorder.record(frame2, avutil.AV_PIX_FMT_YUV420P);
  
              }
  
  
  
              recorder.stop();
  
              grabber1.stop();
  
              grabber2.stop();
  
              filter.stop();
  
  
  
          } catch (Exception e) {
  
              strReturn = Enum.Result.KO;
  
              ExceptionHandler.logException(e);
  
          }
  
      }
  
  
  
      return strReturn;
  
  }

• How to use ffmpeg to make a video from one still image with height from 0 to 100% animation，

  30 août 2021, par Xiang Chen

  I want use a still image to make a transparent webm video, this video needs to have the following style :

  


  

  1. The image height auto increase from 0 to 100% in specific time.

  


  2. I don't want scroll effect , what i want is just like the image spread from top to bottom

  


  


  Below is my demo image :

  


  

  


  This is the effect I want :

  


  

  


  Black color part represent transparency.

  


• How to use ffmpeg make a video from one still image with height from 0 to 100% animation

  28 août 2021, par Xiang Chen

  I want use a still image to make a transparent webm video, this video needs to have the following style :

  


  

  1. the image height auto increase from 0 to 100% in specific time.

  


  2. I don't want scroll effect , what i want is just like the image spread from top to bottom

  


  


  below is my demo image

  


  Please help me , thanks a lot