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• change audio part from mkv video file to flac audio file without losing quality [closed]

  29 août 2023, par Jimmy wu

  how could I write a Linux command to manipulate ffmpeg to change audio part from mkv video file to flac audio file without losing quality ?

  


  I use following command and I found that the size of audio file is almost the same as video file.

  


  ffmpeg -i "2023-08-28 15-32-02.mkv" -ss 0:0:0 -to 1:9:2

8 -vn -c:a flac 2023_08_28_CPU_DV_1.flac


  


  what command should I use ?

  


  I want to change "only audio part" from mkv video file to flac audio file without losing quality,

  


  then the size of file would not be that big

  


• Bash : sort find results using part of a filename

  13 novembre 2015, par utt50

  I have 3 webcams set up in a building, uploading still images to a webserver. I’m using ffmpeg to encode the jpgs to mp4 video.

  The directories are set up like this :

  Cam1/201504
  
  Cam1/201505
  
  Cam2/201504
  
  Cam2/201505
  
  Cam3/201504
  
  Cam3/201505

  I’m using the following bash loop/ffmpeg parameters to make one video per camera, per year. This works well so far (well... except that my SSD is rapidly degrading in performance - too many simultaneous read/write operations ?) :

  find Cam2/2013* -name "*.jpg" -print0 | xargs -0 cat | ffmpeg -f image2pipe -framerate 30 -vcodec mjpeg -i - -vcodec libx264 -profile:v baseline -level 3.0 -movflags +faststart -crf 19 -pix_fmt yuv420p -r 30 "Cam2-2013-30fps-19crf.mp4"

  The individual files are named like this (confusing ffmpeg’s built-in file sequencer) :

  Cam1_2015052413543201.jpg
  
  Cam1_2015052413544601.jpg
  
  Cam2_2015052413032601.jpg
  
  Cam2_2015052413544901.jpg

  I now need to create one video for an entire year across all 3 cameras, ordered by timestamp. To accomplish this, I need to sort the find results by the segment of the filename after the underscore.

  What do I pipe the find output to to accomplish this ? For example, the files above would be ordered like this :

  Cam2_2015052413032601.jpg
  
  Cam1_2015052413543201.jpg
  
  Cam1_2015052413544601.jpg
  
  Cam2_2015052413544901.jpg

  Any help is very much appreciated !

• ffmpeg freezes some part of video using android ffmpeg

  13 octobre 2017, par Tushar Pingale

  When i am Creating video parts, ffmpeg freezes some parts of the video, mostly the end part of the video. The command i am using for ffmpeg is as follows :

  public void doSplitting(String path, long start, long duration, String outputPath) throws FFmpegCommandAlreadyRunningException {
  
      new File(outputPath).getParentFile().mkdirs();
  
      String newpath = generateFromKitkat(path);
  
      String[] complexCommand = new String[]{"-i", newpath, "-itsoffset", "0.10", "-i", newpath, "-ss", ((int) (start / 1000)) + "", "-t", ((int) (duration / 1000)) + "", "-vcodec", "copy", "-acodec", "copy", "-map", "0:0", "-map", "1:1", outputPath};
  
      String logMessage = "";
  
      for (String str : complexCommand) {
  
          logMessage = logMessage + " " + str;
  
      }
  
      Log.d("Complex Command", logMessage);
  
  //ffmpeg Execution
  
  
  
  }