Recherche avancée

Sur d’autres sites (10977)

• How to use mjpeg or mpeg4 encoders to create a video from jpegs via code ?

  26 mars 2012, par Jona

  I'm not sure how to start I'm new to ffmpeg but determined to figure it out.

  I already got everything ready to start using ffmpeg but I'm not sure what class to call to start encoding jpeg's to video mjpeg or mpeg4.

  Any help greatly appreciated !

• Fast video compression like Whatsapp

  5 août 2015, par Douglas Anunciação

  I need to speed up video compression in my Android app. I’m using FFMPEG and it takes 3 minutes to compress 80MB video. Does anyone knows a better solution ?

  The command I’m using is :

  /data/data/com.moymer/app_bin/ffmpeg -y -i /storage/emulated/0/DCIM/Camera/VID_20150803_164811363.mp4 -s 640x352 -r 25 -vcodec mpeg4 -ac 1 -preset ultrafast -strict -2 /storage/emulated/0/DCIM/Camera/compressed_video.mp4

  I’m running this command using FFMPEG for Android from this github repo : https://github.com/guardianproject/android-ffmpeg-java

  The code to use FFMPEG in my project is inside an AsyncTask and is copied below :

      @Override
  
      protected Object doInBackground(Object... params) {
  
  
  
          ItemRoloDeCamera compressedVideo = new ItemRoloDeCamera();
  
  
  
          File videoInputFile = new File(video.getSdcardPath());
  
  
  
          File videoFolderFile = videoInputFile.getParentFile();
  
  
  
          File videoOutputFile = new File(videoFolderFile, "video_comprimido_moymer.mp4");
  
  
  
          if (videoFolderFile.exists())
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video folder exist");
  
          else
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video folder DON'T exist");
  
  
  
          if (videoInputFile.exists())
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video input file exist");
  
          else
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video input file DON'T exist");
  
  
  
          if (videoOutputFile.exists())
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video output file exist");
  
          else
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video output file DON'T exist");
  
  
  
          FfmpegController ffmpegController;
  
  
  
          try {
  
  
  
              ffmpegController = new FfmpegController(context, videoFolderFile);
  
  
  
              Clip clipIn = new Clip(videoInputFile.getAbsolutePath());
  
  
  
              ffmpegController.getInfo(clipIn, new ShellUtils.ShellCallback() {
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
                      videoInfo.add(shellLine);
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      videoInfo.add(String.valueOf(exitValue));
  
                  }
  
              });
  
  
  
              int rotate = getRotateMetadata();
  
  
  
              Clip clipOut = new Clip(videoOutputFile.getAbsolutePath());
  
              clipOut.videoFps = "24";
  
              clipOut.videoBitrate = 512;
  
              clipOut.audioChannels = 1;
  
              clipOut.width = 640;
  
              clipOut.height = 352;
  
  
  
              if (rotate == 90)
  
                  clipOut.videoFilter = "transpose=1";
  
              else if (rotate == 180)
  
                  clipOut.videoFilter = "transpose=1,transpose=1";
  
              else if (rotate == 270)
  
                  clipOut.videoFilter = "transpose=1,transpose=1,transpose=1";
  
  
  
              millisDuration = getVideoDuration(videoInputFile.getAbsolutePath());
  
  
  
              float secondsDuration = millisDuration / 1000f;
  
  
  
              clipOut.duration = secondsDuration;
  
  
  
              ffmpegController.processVideo(clipIn, clipOut, true, new ShellUtils.ShellCallback() {
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
  
  
                      android.util.Log.e("COMPRESS VIDEO UTILS", "shellOut - " + shellLine);
  
  
  
                      float percentage = getTimeMetadata(shellLine);
  
  
  
                      if (percentage >= 0f)
  
                          publishProgress(percentage);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      android.util.Log.e("COMPRESS VIDEO UTILS", "proccess complete - " + exitValue);
  
                  }
  
              });
  
  
  
  
  
          } catch (IOException e) {
  
              e.printStackTrace();
  
          } catch (Exception e) {
  
              e.printStackTrace();
  
          } finally {
  
  
  
              if (videoOutputFile.exists()) {
  
  
  
                  android.util.Log.e("COMPRESS VIDEO UTILS", "finished ffmpeg ---> video output file exist");
  
  
  
                  compressedVideo.setSdcardPath(videoOutputFile.getAbsolutePath());
  
  
  
                  return compressedVideo;
  
  
  
              } else
  
                  android.util.Log.e("COMPRESS VIDEO UTILS", "finished ffmpeg ---> video output file DON'T exist");
  
  
  
          }
  
  
  
          return compressedVideo;
  
  
  
      }
  
  
  
      private float getTimeMetadata(String shellLine) {
  
  
  
          float percentage = -1;
  
  
  
          if (shellLine.contains("time=")) {
  
  
  
              String[] timeLine = shellLine.split("=");
  
  
  
              String time = timeLine[5];
  
              time = time.replace("bitrate", "");
  
              time = time.trim();
  
  
  
  //            String source = "00:10:17";
  
              String[] tokens = time.split(":");
  
              int secondsToMs = (int) (Float.parseFloat(tokens[2]) * 1000);
  
              int minutesToMs = Integer.parseInt(tokens[1]) * 60000;
  
              int hoursToMs = Integer.parseInt(tokens[0]) * 3600000;
  
              long timeInMillis = secondsToMs + minutesToMs + hoursToMs;
  
  
  
              percentage = (timeInMillis * 100.0f) / millisDuration;
  
  
  
          }
  
  
  
          return percentage;
  
  
  
      }
  
  
  
      private int getRotateMetadata() {
  
  
  
          int rotate = 0;
  
  
  
          String durationString = "";
  
  
  
          for (String shellLine : videoInfo) {
  
  
  
              if (shellLine.contains("rotate")) {
  
  
  
                  //rotate          : 270
  
  
  
                  String[] rotateLine = shellLine.split(":");
  
  
  
                  rotate = Integer.parseInt(rotateLine[1].trim());
  
  
  
              }
  
  
  
          }
  
  
  
          return rotate;
  
  
  
      }
  
  
  
      public static long getVideoDuration(String videoPath) {
  
  
  
          MediaMetadataRetriever retriever = new MediaMetadataRetriever();
  
  
  
          retriever.setDataSource(videoPath);
  
  
  
          String time = retriever
  
                  .extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
  
  
  
          long timeInmillisec = Long.parseLong(time);
  
  
  
          return timeInmillisec;
  
  
  
      }

  The only change I made in the processVideo method was to add the following lines when building the commmand :

  cmd.add("-preset");
  
  cmd.add("ultrafast");

• video conversion using ffmpeg in php

  24 mars 2012, par user1270879

  I am converting videos to .flv format using ffmpeg in php. The files are converted into .flv but the size of the file 0 kb. What is the reason ?

  My code

  $ffmpegPath = "/usr/bin/ffmpeg";
  
  $flvtool2Path = "/usr/bin/flvtool2";
  
  
  
  $cmd=($ffmpegPath . " -i " . $srcFile . " -ar " . $srcAR . " -ab " . $srcAB . " -f flv -s " . $srcWidth . "x" . $srcHeight . " " . $destFile . " | " . $flvtool2Path . " -U stdin " . $destFile);