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• Batch-converting multimedia-files on Command-Line using find and ffmpeg (Linux)

  11 mai 2018, par free_speech

  For converting more Audio-Files (Let’s say, FLAC to MP3) in the same folder on Command-Line, I formerly used

  find ./ -name "*.flac" -exec ffmpeg -i "{}" -b:a 320k "{}".mp3 \;

  but the problem is that the resulting MP3-Files are named like Artist - Title.flac.mp3.
  This doesn’t even surprise me, but what do I have to type if I want to avoid the ".flac.mp3"-Filenames ?
  The converted Files should be named like Artist - Title.mp3, not this .flac.mp3
  I didn’t yet find a way to solve this problem ...
  Thanks.

• How can I find video rotation and rotate the clip accordingly using moviepy ?

  28 mars 2022, par Tom Burrows

  I'm using moviepy to import some videos, but the videos that should be in portrait mode are imported in landscape. I need to check whether the rotation has been changed, and if it has, rotate it back.

  



  Is this functionality built into moviepy ? If not, how else can I check it ?

  


• Unable to find/write moov atom in the mp4 recorded stream

  11 juillet 2014, par AnilJ

  I have written the following code to write the webcam feed into a file (.mp4) on disk. The program is successful, but when I try to play the file using player, it says "moov atom not found" and player is not showing anything. The file however is a valid mp4 file according to ffmpeg command.

  This is my main thread where I encode a picture every 30ms.

  public void run() {        
  
  
  
      // Set the thread rolling.
  
      mRunning = true;
  
  
  
      while (mRunning) {
  
          // and display it on the Java Swing window
  
          Record();
  
      }
  
  
  
      // clean up resources
  
      cleanup();
  
  }
  
  
  
  private void Record() {
  
  
  
      IVideoPicture picture = null;
  
      BufferedImage image = null;
  
  
  
      picture = GetNextPicture();
  
      image = Utils.videoPictureToImage(picture);
  
  
  
      if (picture != null) {  
  
          // If recording is enabled, record the webcam stream.
  
          if (mRecordStream) {
  
  
  
              // convert to the right image type
  
              BufferedImage bgrScreen = ConvertToType(image, BufferedImage.TYPE_3BYTE_BGR);
  
  
  
              // encode the image to stream #0
  
              mWriter.encodeVideo(0, bgrScreen, System.nanoTime() - mStartTime, TimeUnit.NANOSECONDS);
  
          }
  
  
  
          try {
  
              Thread.sleep(30);
  
          } catch (InterruptedException e) {
  
              return;
  
          }
  
      }
  
  }

  From the main thread, I do this when I want to stop the recording and close this recording thread. The cleanup() method is eventually called by the main thread to close the writer. The comment does says about writing the trailer (I guess moov atom), but it does not do it. Can someone please help me find where the problem is ?

  public void stopRecording() {      
  
      // Stop the thread loop.
  
      mRunning = false;
  
  }
  
  
  
  private void cleanup() {
  
  
  
      // tell the writer to close and write the trailer if  needed
  
      if (mWriter != null) {
  
          mWriter.close();
  
          mWriter = null;
  
      }
  
  
  
      if (mVideoCoder != null) {
  
          mVideoCoder.close();
  
          mVideoCoder = null;
  
      }
  
  
  
      if (mContainer != null) {
  
          mContainer.close();
  
          mContainer = null;
  
      }
  
  }