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• 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
  
  
  
  }

• Split video stream with FFmpeg and play part with FFplay [closed]

  22 mars 2024, par Jan Hein

  I have a video stream send with FFmpeg to a other computer on my local network.
At the receiver computer I want to split the video stream in multiple parts and play them at the receiver computer. How can I do that ?

  


  Example :
Stream send form sender to receiver is 1000x1000 pixels.
At the receiver split the 1000x1000 pixel stream into four parts of 500x500 pixels, and play them all four on the receiver in a separate player.

  


  I have tryed it with a multicast stream to the receiver, and played it four times with FFplay, but that was not working correct.

  


  I also hve looked for multiple outputs with FFmpeg and then multiple pipes to FFplay, but could not find a solution.