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• avfilter/vf_paletteuse : Fix potential double-free of AVFrame

  27 janvier 2020, par Andreas Rheinhardt

  avfilter/vf_paletteuse : Fix potential double-free of AVFrame
  apply_palette() would free an AVFrame given to it only via an AVFrame *
  
  (and not via AVFrame **) in three of its four exists (namely in the
  
  normal path and in two error paths). So upon error the caller has no way
  
  to know whether the frame has already been freed or not ;
  
  load_apply_palette(), the only caller, opted to free the frame in this
  
  scenario.
  This commit changes this by making apply_palette not freeing the frame
  
  at all, which is left to load_apply_palette().
  Fixes Coverity issue #1452434.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/vf_paletteuse.c

• How can i combine a 1 video file (flv) with image file using ffmpeg ?

  6 mars 2016, par user6964

  I have the following question. I need to combine 1 video (.Flv) to an image (png or jpg) generating a new video (.Flv) and then combine it with another video (.Flv). The flow should be as follows :

  First, combine a video image where the video should play normally until the last second and then the image should appear.

  Second, combining the resulting video with another video.

  I tried to do the first step with the following command :

  ffmpeg-i-loop_input movie_1.flv picture.png-i-acodec copy-shortest movie_output.flv

  But the result is that the image is displayed over video.

  Then try connecting 2 flv videos with the following command :

  ffmpeg-i-i movie_2.flv output_final.flv movie_output.flv

  But only shows 1 video in "output_final.flv".

  Can you tell me I’m doing wrong in my command ?

  Thank you.

• How to convert video file to audio file by using FFMPEG ?

  15 janvier 2020, par Aamir Naseer

  I’m making video to audio converter app but need help to convert video to audio using ffmpeg. I checked many answers and websites but their answers are not easy to understand and I’m confused with command that is used to convert. What is the proper command to convert video to audio and is I’m executing the command in right way ?

  public class VideoConvertActivity extends AppCompatActivity {
  
  
  
      private VideoView videoView;
  
      private Button convertButton;
  
      private String filePath;
  
      private FFmpeg ffmpeg;
  
  
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_video_convert);
  
  
  
          videoView = findViewById(R.id.videoviewID);
  
          convertButton = findViewById(R.id.convertbuttonID);
  
  
  
          ffmpeg = FFmpeg.getInstance(VideoConvertActivity.this);
  
  
  
  // in variable video i'm getting the path of video path from previous activity through intent and that video will have to convert to audio file
  
          Intent extras = getIntent();
  
          final String video = extras.getStringExtra("video");
  
  
  
          videoView.setVideoPath(video);
  
          videoView.start();
  
  
  
          convertButton.setOnClickListener(new View.OnClickListener() {
  
              @Override
  
              public void onClick(View v) {
  
  
  
                  try {
  
  
  
                      File moviesDir = Environment.getExternalStoragePublicDirectory(
  
                              Environment.DIRECTORY_MUSIC
  
                      );
  
  
  
                      String filePrefix = "convert_audio";
  
                      String fileExtn = ".mp3";
  
                      File dest = new File(moviesDir, filePrefix + fileExtn);
  
  
  
                      int fileNo = 0;
  
                      while (dest.exists()) {
  
                          fileNo++;
  
                          dest = new File(moviesDir, filePrefix + fileNo + fileExtn);
  
                      }
  
                      filePath = dest.getAbsolutePath();
  
  
  
                      // to execute "ffmpeg -version" command you just need to pass "-version"
  
                      String[] command = {"-y", "-i", video, "-vn", "-ar", "44100", "-ac", "2", "-b:a", "256k", "-f", "mp3", filePath};
  
                      ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
  
  
                          @Override
  
                          public void onStart() {
  
                              Toast.makeText(VideoConvertActivity.this,"Started",Toast.LENGTH_LONG).show();
  
                          }
  
  
  
                          @Override
  
                          public void onProgress(String message) {
  
                              Toast.makeText(VideoConvertActivity.this,"Progress",Toast.LENGTH_LONG).show();
  
                          }
  
  
  
                          @Override
  
                          public void onFailure(String message) {
  
                              Toast.makeText(VideoConvertActivity.this,"Failed",Toast.LENGTH_LONG).show();
  
                          }
  
  
  
                          @Override
  
                          public void onSuccess(String message) {
  
                              Toast.makeText(VideoConvertActivity.this,"Succeed",Toast.LENGTH_LONG).show();
  
                          }
  
  
  
                          @Override
  
                          public void onFinish() {
  
                              Toast.makeText(VideoConvertActivity.this,"Finished",Toast.LENGTH_LONG).show();
  
                          }
  
                      });
  
                  } catch (FFmpegCommandAlreadyRunningException e) {
  
                      // Handle if FFmpeg is already running
  
                  }
  
  
  
                   Toast.makeText(VideoConvertActivity.this,"Converted Successfully",Toast.LENGTH_SHORT).show();
  
  
  
              }
  
          });
  
  
  
      }
  
  
  
  }