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• In Flutter, how to get image pixel

  12 janvier 2024, par Pianone

  my code here

  


  var response = await Dio().get(
   url,
   options: Options(responseType: ResponseType.bytes)
);
Uint8List? srcImage = Uint8List.fromList(response.data);
Uint8List? watermark = await captureWaterMark();
Image i = Image.memory(srcImage!);
//how can I get the pixel (Image i) such like 1920*1080 or just width/hight pixel
...tell me how to do...
srcImage = await addWaterMarkByFfmpegCommand(srcImage, watermark);
   final result = await ImageGallerySaver.saveImage(
      srcImage!, name: name,
   );


  


  i need get the pic pixel so that i can use it in ffmpeg command, it a func that add a watermark into srcImage, but cause their pixel ratio too diff to adapted watermark

  


  i try to get pixel from ffmpeg... but i failed

  


  /// addWaterMark by using ffmpeg Command
Future addWaterMarkByFfmpegCommand(Uint8List srcImg, Uint8List watermark) async {
  try {
    final Directory tempDir = await Directory.systemTemp.createTemp();
    final File image1File = File('${tempDir.path}/srcImg.jpg');
    await image1File.writeAsBytes(srcImg);
    final File image2File = File('${tempDir.path}/watermark.png');
    await image2File.writeAsBytes(watermark);

    final String outputFilePath = '${tempDir.path}/output.jpg';
    //when i get srcImage pixel, the positions in bold(iw*1) in the following commands will be replaced to make watermark adapted
    final String command =
        '-i ${image1File.path} -i ${image2File.path} -filter_complex "[1:v]scale=**iw*1**:-1[v1];[0:v][v1]overlay=10:10" -frames:v 1 $outputFilePath';
    await FFmpegKit.execute(command);

    final File outputFile = File(outputFilePath);
    final Uint8List outputBytes = await outputFile.readAsBytes();
    return outputBytes;
  } catch (e) {
    print('Error executing ffmpeg command: $e');
  }
  return null;
}


  


  ps : i am new to flutter and ffmpeg, plz help me, I'd appreciate, thanks alot

  


• Avoid auto rotating video in HTML

  15 septembre 2016, par hasanghaforian

  I use ffmpeg to convert a 3gp video to MP4. You can see a part of output of ffmpeg here :

  ffmpeg version N-79139-gde1a0d4 Copyright (c) 2000-2016 the FFmpeg developers

  ...

  Input #0, 
  
  
  
  ...
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : ...
  
        handler_name    : VideoHandle
  
        encoder         :                                
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      ...

  I use noautorotate option in below command to avoid auto rotate based on metadata of file and it is successful. Then I tried this HTML code to open converted file in a browser(for example by Google Chrome) :

  <video width="320" height="240" controls="controls">
  
    <source src="../videos/test.mp4" type="video/mp4">
  
  </source></video>

  But when I open that, video shown rotated. How I can solve this problem ? Is there a tag or any other thing to disable autorotate in HTML ?

• About VPS Server Linux

  3 juillet 2024, par Rai Abdullah

  can any body tell me how can i install the FFMPEG, MENCODER to my VPS server. i have WHM and cPanel.

  



  any help about this will be appreciated.

  



  thanks