Recherche avancée

Sur d’autres sites (3361)

• Insert video into another video both of different formats in a time efficient way

  7 février 2017, par Sharath Huddar

  I have an assignment which requires that the code I write takes a large video(1 to 3 hrs) and a smaller video (10-60 seconds) and the smaller video is inserted at intervals of 30 minutes into the larger video. Note that the videos are not necessarily in the same format.

  I tried to encode the large and the small video to a common format (mp4) and then split the large video based on time (while encoding it to mp4) and then concat all the videos in a predefined sequence (also while encoding to mp4). All these operations were carried out using FFMPEG.

  Although this method worked, it too close to 20 hours to perform the whole operation on an Intel NUC (having an i5 processor and 8GB RAM)

  Is there a faster way to do this without compromising on quality ?

• Getting same frame each time using FFmpegFrameGrabber.grabImage() in Android

  12 février 2017, par AlphabateCoder

  Trying to extract each frame from a video file using javaCV, FFFmpegFramGrabber and save as jpg, end up getting the same frame each time.

        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(cVideoFilePath+ "/" + "VID_20170211_132657.mp4");
  
      try {
  
          AndroidFrameConverter convertToBitmap = new AndroidFrameConverter();
  
          grabber.start();
  
  
  
          for (int i= 0; i< grabber.getFrameRate();i++){
  
  
  
               frame1 = grabber.grabImage();
  
              Bitmap bitmap = convertToBitmap.convert(frame1);
  
              String date = simpleDateFormat.format(new Date());
  
              File picfile = new File(file_name);
  
              if (!picfile.exists()) {
  
                  try {
  
                      picfile.createNewFile();
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
              }
  
              try {
  
  
  
                  FileOutputStream out = new FileOutputStream(picfile);
  
                  bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
  
                  out.flush();
  
                  out.close();
  
  
  
              } catch (IOException ex) {
  
  
  
              } finally {
  
  
  
              }
  
  }

• ffmpeg copy video in video with a specific time

  13 février 2017, par Alkl

  Im new in this topic (beginner) and Im german... So it’s a bit difficult to find the correct words...

  I’ll try to explain what I’ve done and what I want to do :

  1. Extract video area from the original video converted in PRORES codec :

     ffmpeg.exe -i test.mkv -ss 00:06:21.99 -t 00:00:01.94 -async 1 -strict -2 -c:v prores_ks -pix_fmt yuva444p10le -profile:v 4444 -bits_per_mb 8000 -s 1920x1080 cut_video.mov

  2. Edit the cut in After Effects

  3. Convert the PRORES in Matroska

     ffmpeg.exe -i "C :\Users\Alex\Desktop\ffmpeg-20170202-08b0981-win64-static\bin\cut_video\cut_video.mov" -vcodec ffv1 -acodec pcm_s16le temp.mkv

  4. Replace the video area in the originale video file at the time 00:06:21.99...

  I spend 4 hours for the two commands...
  So I despair at the fourth step. Is it possible ? Can you help me ?

  I made a picture, so you can understand better what Im doing... : http://i.imgur.com/HqlNxzW.jpg

  Best regards from germany,

  Alex