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• Different code(.java file) for different platform ?

  2 mars 2016, par AR792

  I have a code where image data is passed from bitmap to FFmpeg frame recorder and converted to a video. But i need to make small changes while running it on LG G3(armv7) from Asus zenfone 5(x86).

  Following are the class variables that create the issue :(declared under, class Main Activity)

  inputWidth = 1024 ;

  inputHeight = 650 ;

  Following is the method where the issue occurs :

   byte [] getNV21(int inputWidth, int inputHeight, Bitmap bitmap) {
  
  
  
      int [] argb = new int[inputWidth * inputHeight];
  
  
  
      bitmap.getPixels(argb, 0, inputWidth, 0, 0, inputWidth, inputHeight);
  
  
  
      byte [] yuv = new byte[inputWidth*inputHeight*3/2];
  
      encodeYUV420SP(yuv, argb, inputWidth, inputHeight);
  
  
  
      return yuv;
  
  }
  
  
  
  void encodeYUV420SP(byte[] yuv420sp, int[] argb, int width, int height) {
  
      final int frameSize = width * height;
  
  
  
      int yIndex = 0;
  
      int uvIndex = frameSize;
  
  
  
      int a, R, G, B, Y, U, V;
  
      int index = 0;
  
      for (int j = 0; j < height; j++) {
  
          for (int i = 0; i < width; i++) {
  
  
  
              a = (argb[index] & 0xff000000) >> 24; // a is not used obviously
  
              R = (argb[index] & 0xff0000) >> 16;
  
              G = (argb[index] & 0xff00) >> 8;
  
              B = (argb[index] & 0xff) >> 0;
  
  
  
              // well known RGB to YUV algorithm
  
              Y = ( (  66 * R + 129 * G +  25 * B + 128) >> 8) +  16;
  
              U = ( ( -38 * R -  74 * G + 112 * B + 128) >> 8) + 128;
  
              V = ( ( 112 * R -  94 * G -  18 * B + 128) >> 8) + 128;
  
  
  
              // NV21 has a plane of Y and interleaved planes of VU each sampled by a factor of 2
  
              //    meaning for every 4 Y pixels there are 1 V and 1 U.  Note the sampling is every other
  
              //    pixel AND every other scanline.
  
              yuv420sp[yIndex++] = (byte) ((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));
  
              if (j % 2 == 0 && index % 2 == 0) {
  
                  yuv420sp[uvIndex++] = (byte)((V<0) ? 0 : ((V > 255) ? 255 : V));
  
                  yuv420sp[uvIndex++] = (byte)((U<0) ? 0 : ((U > 255) ? 255 : U));
  
              }
  
  
  
              index ++;
  
          }
  
      }
  
  }

  Working CODE :

  LG G3 :I can use the above variables at any place in the code to get the required output.
  Bitmap size returned = 2734200

  Asus Zenfone 5 : Except at creating the bitmap, I have to use everywhere else bitmap.getHeight() and bitmap.getWidth(), to get the required output.

  Surprisingly here Bitmap size returned = 725760 (So its not setting according to set bitmap parameters ?)

  INCORRECT CODE :

  LG G3 : IF i use bitmap.getHeight() and bitmap.getWidth(), i get java.lang.ArrayIndexOutOfBoundsException : length = 102354 , index = 102354. @getNV21 method

  Asus Zenfone 5 : If i use inputWidth , inputHeight i get
  java.lang.IllegalArgumentException : x + width must be <= bitmap.width() @getNV21 method

  How can i generalize the above code for both phones ?

• When I run code in Docker I get a Django error [Errno 2]. When running locally everything works. Why ?

  8 février 2021, par Bartłomiej Kokoszka

  I don't know what's going on. A script run by Django works fine, but not through Docker and Django. An error is returned :

  &#xA;

  Pic Errno 2 No such file or directory

  &#xA;

  Below is the code of the function with the error and the code of the Dockerfile.

  &#xA;

  '''

  &#xA;

  def mediainfo(filepath):
    


  &#xA;

  Original code :

  &#xA;

  &#xA;

      prober = get_prober_name()
    command_args = [
        "-v", "quiet",
        "-show_format",
        "-show_streams",
        filepath
    ]

    command = [prober, '-of', 'old'] + command_args


  &#xA;

  &#xA;

  Modified code :

  &#xA;

  &#xA;

      command = f"ffprobe -v error -show_format -show_streams -select_streams v:0 {filepath}"


  &#xA;

  &#xA;

  The rest of the functions :

  &#xA;

      res = Popen(command, stdout=PIPE)&#xA;    output = res.communicate()[0].decode("utf-8")&#xA;&#xA;    if res.returncode != 0:&#xA;        output = Popen(command, stdout=PIPE).communicate()[0].decode("utf-8")&#xA;&#xA;    rgx = re.compile(r"(?:(?P.*?):)?(?P<key>.*?)\=(?P<value>.*?)$")&#xA;    info = {}&#xA;&#xA;    if sys.platform == &#x27;win32&#x27;:&#xA;        output = output.replace("\r", "")&#xA;&#xA;    for line in output.split("\n"):&#xA;        # print(line)&#xA;        mobj = rgx.match(line)&#xA;&#xA;        if mobj:&#xA;            # print(mobj.groups())&#xA;            inner_dict, key, value = mobj.groups()&#xA;&#xA;            if inner_dict:&#xA;                try:&#xA;                    info[inner_dict]&#xA;                except KeyError:&#xA;                    info[inner_dict] = {}&#xA;                info[inner_dict][key] = value&#xA;            else:&#xA;                info[key] = value&#xA;&#xA;    return info&#xA;</value></key>

  &#xA;

  '''

  &#xA;

  Code of the Dockerfile

  &#xA;

  '''

  &#xA;

  FROM python:3.7 as base

EXPOSE 80

WORKDIR /app
COPY . /app


ENV PYTHONDONTWRITEBYTECODE=1

ENV PYTHONUNBUFFERED=1

RUN pip install --upgrade pip
RUN echo 'deb http://deb.debian.org/debian buster-backports main contrib non-free' >> /etc/apt/sources.list
RUN apt-get update

RUN apt-get -y install ffmpeg
RUN apt-get update

COPY requirements.txt .
RUN python -m pip install -r requirements.txt

FROM base as prod

ENTRYPOINT ["python","manage.py","runserver","0.0.0.0:80"]


  &#xA;

  '''

  &#xA;

• ffmpeg source code modification [closed]

  27 novembre 2011, par adismsc

  Anybody is able to help me modify source code of an ffmpeg in a way that during encoding to an mpeg-ts container SDT tables were not added ? Or if is it possible : how to disable SDT tables in encoding process ?