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• avcodec/png : support cICP chunks

  17 janvier 2023, par Leo Izen

  avcodec/png : support cICP chunks
  This commit adds both decode and encode support for cICP chunks, which
  
  allow a PNG image's pixel data to be tagged by any of the enum values in
  
  H.273, without an ICC profile.
  Upon decode, if a cICP chunk is present, the PNG decoder will tag output
  
  AVFrames with the resulting enum color, and ignore iCCP, sRGB, gAMA, and
  
  cHRM chunks, as per the spec.
  Upon encode, if the color space is known and specified, and it is not sRGB,
  
  the PNG encoder will output a cICP chunk containing the color space. If the
  
  color space is sRGB, then it will output an sRGB chunk instead of a cICP
  
  chunk. If the color space of the input is not unspecified, it will not output
  
  a cICP chunk tagging the PNG as unspecified.
  In either the sRGB case or the non-SRGB case, gAMA and cHRM are still written
  
  as fallbacks provided the info is known.
  Signed-off-by : Leo Izen <leo.izen@gmail.com>
  

  • [DH] libavcodec/pngdec.c
  • [DH] libavcodec/pngenc.c

• FFMPEG set -ss and -to with string

  12 mai 2017, par NewUser

  I know I can set the start with -ss and end with -to but can someone please help me to format the following so that I can enter the -ss and -to with a string ?

  I want -ss to come from

  String start = editStart.getText().toString();

  and -to to come from

  String end = editEnd.getText().toString();

  Here is my ffmpeg string I want to edit, I have entered -ss and -to to show where I want the above strings to be.

  String s = "-i" + " " + mVideoUri.toString().replace("file:///", "") + " -i " + newBackgroundBitmap.getPath() +  " -filter_complex [1:v][0:v]scale2ref=iw:ih[ovr][base];[ovr]colorchannelmixer=aa=0.7[ovrl];[base][ovrl]overlay[v] -ss -to -map [v] -c:v libx264 -preset ultrafast " + directoryToStore + "/" + FileName + mp4;
  
  
  
  String[] arguments = s.split(" ");
  
  
  
  ExecuteFFMPEG(arguments);

  ---

  EDIT

  Here is the full ffmpeg

  //Button onclick
  
  public void onButtonClicked(View view) {
  
      switch (view.getId()) {
  
  
  
      //WHEN THE EXPORT BUTTON IS CLICKED
  
      case Export:
  
          String s = "-i" + " " + mVideoUri.toString() + " -i " + newBackgroundBitmap.getPath() + " -filter_complex [1:v][0:v]scale2ref=iw:ih[ovr][base];[ovr]colorchannelmixer=aa=0.7[ovrl];[base][ovrl]overlay[v] -map [v] -c:v libx264 -preset ultrafast " + directoryToStore + "/" + lastSaved + mp;
  
          String[] arguments = s.split(" ");
  
          ExecuteFFMPEG(arguments);
  
  
  
      }
  
  }
  
  
  
  //Added onLoad FFMPEG
  
  public void LoadFFMPEG() {
  
  
  
      FFmpeg ffmpeg = FFmpeg.getInstance(getBaseContext());
  
      try {
  
          ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  super.onStart();
  
  
  
              }
  
  
  
              @Override
  
              public void onFailure() {
  
                  super.onFailure();
  
              }
  
  
  
              @Override
  
              public void onSuccess() {
  
                  super.onSuccess();
  
  
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
                  super.onFinish();
  
              }
  
          });
  
      } catch (FFmpegNotSupportedException e1) {
  
          e1.printStackTrace();
  
          Log.d("[FFMPEGMain Exception]-", e1.toString());
  
      }
  
  }
  
  
  
  //Added Exceute FFMPEG
  
  public void ExecuteFFMPEG(String[] command) {
  
  
  
  
  
      FFmpeg ffmpeg = FFmpeg.getInstance(getBaseContext());
  
      try {
  
  
  
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  super.onStart();
  
                  Log.d("[Start]", "start");
  
  
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {
  
                  Log.d("[Progress]", message);
  
              }
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.d("[fail]", message);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  Log.d("[Success]", message);
  
  
  
  
  
              }
  
  
  
  
  
              @Override
  
              public void onFinish() {
  
                  super.onFinish();
  
                  Log.d("[Finish]", "file output done");
  
  
  
              }
  
  
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          // Handle if FFmpeg is already running
  
          Log.d("[FFMPEG Exception]-", e.toString());
  
  
  
      }
  
  
  
  
  
  }

  The above works perfectly as I was hoping. Now I want to set the start and end of the video (depending on the position the user selected). I get the start and end of the video back as a string, like this :

  String valueRight = formatter.format(getValueRight);
  
  String valueLeft = formatter.format(getValueLeft);
  
  
  
  //this strings will return 00:00:00.000 DEPENDING on the position from the user
  
  //just like when you would normally call -ss 00:00:50.849 -to 00:02:05.100

  As I mentioned above that I know it should be set as -ss and -to but I am looking for a wat to format my string to enter -ss and -to with a string, somthing like this :

  -ss valueLeft -to valueRight

  ---

• Get single buffer from AVFrame data and display it on Android Bitmap/Surface/SurfaceView

  13 novembre 2011, par Ivan

  I have decoded AVFrame from avcodec_decode_video2 function (FFmpeg) which is then passed to the SWS library and converted from YUV420P format to RGB565. How do I combine all colors and linesizes information i.e. frame->data[0..3], frame->linesize[0..3] into one buffer and how to display it then on the Android device say by using Android Bitmap or SurfaceView/View ? I don't want to use SurfaceFlinger because it is not official part of NDK and it is subject to change with every minor release.