Recherche avancée

Sur d’autres sites (15575)

• Android ffmpeg video cut

  23 juin 2021, par Raupp

  I´m trying to edit some videos in my Android app using FFmpeg, but I´m facing some problems when I tried to take just a part of the video.

  



  I´m using this ffmpeg compilation/lib https://github.com/WritingMinds/ffmpeg-android-java

  



  I tried to use this command to trim/cut the video

  



  "-y -i input.mp4 -ss 00:00:01.00 -t 00:00:15.000 -c copy output.mp4"


  



  But with some videos I´m getting a black screen or the video just freezes. The sound works fine in all my tests.

  



  With this command

  



  "-y -i input.mp4 -ss 00:00:01.000 -t 00:00:15.000 -async 1 output.mp4"


  



  Everything works fine in all my tests (video/sound) but takes too much time to generate the output file, this 15s file takes more than 2 minutes to be generated.

  



  I tried other variations of these commands, but I always get problems with the video stream (with black screen or freezing) or takes too much time to generate the output (the user can only select 15s of the videos to send to my server)

  



  Thanks by the help !

  



  EDIT :

  



  this is the part of the code that is trimming the video

  



  String[] cmd = new String[]{"-y","-i",input,"-ss","00:00:05.000","-vcodec","copy",
            "-acodec","copy","-t","00:00:15.00","-strict","-2",output };

    final FFmpeg ffmpeg = FFmpeg.getInstance(this);
    try {
        ffmpeg.execute(cmd, new FFmpegExecuteResponseHandler() {
            @Override
            public void onSuccess(String message) {
                Log.i("VideoEditActivity", "Success " + message);
                is_video_generated_ = true;
            }

            @Override
            public void onProgress(String message) {
                Log.i("VideoEditActivity", "Progress updated " + message);
            }

            @Override
            public void onFailure(String message) {
                Log.e("VideoEditActivity", "ERROR! " + message);
            }

            @Override
            public void onStart() {
                progress_dialog_.setMessage(getString(R.string.str_video_generating));
                progress_dialog_.show();
            }

            @Override
            public void onFinish() {
                Log.i("VideoEditActivity", "Finished");
                progress_dialog_.hide();

                Intent intent = new Intent(getApplicationContext(), VideoPlayActivity.class);
                intent.putExtra("media", edited_video_path_);
                startActivity(intent);
            }
        });
    } catch (FFmpegCommandAlreadyRunningException e) {
        e.printStackTrace();
    }


  



  This is the original file : [https://drive.google.com/file/d/0BzqJL_nNetbRYmxvcTljanJwR00/view?usp=sharing][1]

  



  And this the output : 0BzqJL_nNetbReENjRGMtVXQ5VHM/view ?usp=sharing (stack overflow does not allow me to add more than 2 links)

  


• ffmpeg - how to build paths on windows

  7 décembre 2016, par Thomas

  I am building a command line for ffmpeg and I am going crazy. It seems like the tool has an abnormal path system and I can’t find any reliable documentation.

  Using Windows, I have a movie file at : "d :\test\movie.mp4"
  if we take the following command :
  

  fmpeg -i <myfile> -vf "select=gt(scene\,0.5), scale=640:360" -vsync vfr thumbnails%03d.png
  
  </myfile>

  I tried to build the the following ways :

  d:\test\movie.mp4
  
  d:\\test\movie.mp4
  
  d\\:\\test\movie.mp4
  
  d:\\:/test/movie.mp4

  It seems like only the 4th one work when called from a C# program, but doesn’t work in command line.

  Is there any documentation that explains this properly ? from what I gather, the drive letter has to be followed by double slashed then the column and I can’t figure out the reason.

• Is it possible to capture images like time lapse using AFORGE FFMPEG ?

  4 juillet 2022, par jom12

  I am trying to make a time lapse video using AFORGE FFMPEG.

  


  I want to capture a video frame every 10 units.

  


          VideoFileReader reader = new VideoFileReader();
        reader.Open(@"\drive.mp4");
            for (long i = 0; i < reader.FrameCount; i++)
            {
                if (i % 10 == 0)
                {
                    Bitmap videoFrame = reader.ReadVideoFrame();
                    videoFrame.Save(@"test\img_" + (i / 10).ToString() + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
                }
            }


  


  However, this code only saved 1 frame as an image instead of 10 frames.

  


  Is there a better way to capture images 10 frames at a time ?