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• Use ffmpeg to resize one input's dimension to match another input's dimension

  18 novembre 2022, par Hans GD

  I need to resize one image A to match one dimension of another input B (make height of A match the height of B, for example). I will do this for several pairs of images in a folder, for which I will use a script in the end, but I wanted to know if this particular operation can be done only with ffmpeg.

  


  Again, the final script could read the image, find the size and use scale=-1:height to accomplish the final goal, but is it posible to make the title's operation only with ffmpeg ?

  


• Create 256 color palette video

  2 mars 2020, par rlcabral

  I already have this working by converting the source video to GIF with :

  ffmpeg -y -t 5 source.mp4 -vf fps=10,scale=480:-1,smartblur=ls=-0.5,crop=iw:ih-2:0:0 -hide_banner -loglevel panic output.gif

  And then converting the GIF to MP4, like so :

  ffmpeg -y animated.gif -hide_banner -pix_fmt yuvj420p -loglevel panic -an -loglevel panic final.mp4

  What I want is to convert source.mp4 directly to final.mp4, and have the same 256 color palette as a normal GIF.

  I tried merging both commands together, and although it generates a MP4, the result is a 16 bit video, surprisingly smaller than a 8 bit video.

  Do I need to generate a palette first with palettegen and then re-encode the video with this palette ?

• Xuggle IMediaWriter error

  10 décembre 2013, par prinsen

  Im testing xuggle and ran into a strange error. I have looked at the example in the documentation, and the xuggle-related code is identical. (http://www.xuggle.com/public/documentation/java/api/com/xuggle/mediatool/IMediaWriter.html)

  public class StorageServer {
  
  
  
  private final static String storage = "storage.mp4";
  
  private final static IMediaWriter writer = ToolFactory.makeWriter(storage);
  
  
  
  private final static Dimension dimension = new Dimension(320, 240);
  
  protected final static Logger logger = LoggerFactory.getLogger(StorageServer.class);
  
  
  
  public static void main(String[] args) {
  
  
  
      writer.addVideoStream(0, 0, ICodec.ID.CODEC_ID_MPEG4,
  
              320, 240);
  
      //setup the connection
  
      StreamServerAgent serverAgent = new StreamServerAgent(new StreamFrameListenerIMPL(), dimension);
  
      serverAgent.start(new InetSocketAddress("localhost", 1337));
  
  }
  
  
  
  
  
  protected static class StreamFrameListenerIMPL implements StreamFrameListener {
  
      private volatile long count = 0;
  
  
  
      @Override
  
      public void onFrameReceived(IVideoPicture image) {
  
          logger.info("frame received :{}", count++);
  
          if (count < 100) {
  
              logger.info("Writing frame");
  
              writer.encodeVideo(0, image);
  
          } else if (count > 220) {
  
              // writer.flush(); // doesn't matter
  
              writer.close();
  
          }
  
      }
  
  
  
  }

  When writer.close is called I get a runtime exception :

  Error: cannot write packet to read only container

  Which seems really strange..