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• Normalize Fish Eye Video

  19 novembre 2016, par Optonom Scientific

  I use more advance super fish eye lens. Unfortunately, I couldn’t find any technical properties of this lens.

  I want to dewrap with ffmpeg software with this command :

  ffmpeg -i left.MP4 -vf lenscorrection=cx=0.055:cy=0.005:k1=-.2:k2=-.2 new1.mp4

  In lenscorrection filter there are four parameters.

  How can I find right value for my lens ?

• FFmpeg mp4 videos load very slow outside of network

  6 juin 2014, par user3550401

  I used ffmpeg to convert my videos to mp4 using libx264 and qt fast start. Im playing my videos through the HTML tag, and when im inside my network where my website is, everything plays fast. But when i try to play the video from an outside network, I have to wait about 10 seconds before a 5 second video is played. And even when its playing, its super choppy. Any reason on why this is ? I am playing the videos in Safari on my iPhone.

  Here is how im encoding my videos :

  ffmpeg -i video.ts -i css/watermark.png -filter_complex overlay=10:main_h-overlay_h-10 -shortest -b:v 800k -vcodec libx264 -acodec libfaac -ar 44100 -ac 2 -b:a 128k -movflags faststart -map_metadata -1 video.mp4

• IOException when trying to run ffmpeg command on Android

  20 avril 2020, par Rashid Faheem

  I am using this library through gradle with Android Studio 3.6.

  



  implementation 'com.github.hiteshsondhi88.libffmpeg:FFmpegAndroid:0.2.5'


  



  This is path of input and output file.

  



  String VideoIn = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Download/Ab.mp4";
String VideoOut = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Download/Ab1.avi";


  



  This is code where I load ffmpeg and try to execute command to convert an mp4 into avi. (Same command i use on windows to do this task). But it say IOException (No such file or directory) although input file is present in Download folder.

  



  private void convert(String VideoIn, String VideoOut) {
    ffmpeg = FFmpeg.getInstance(this);
    try {
        ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
            @Override
            public void onFailure() {
                super.onFailure();
            }

            @Override
            public void onSuccess() {
                super.onSuccess();
            }

            @Override
            public void onStart() {
                super.onStart();
            }

            @Override
            public void onFinish() {
                super.onFinish();
            }
        });
    } catch (FFmpegNotSupportedException e) {
        Log.e(TAG, e.getMessage());
    }

    try {
        ffmpeg.execute("-i " + VideoIn + " " + VideoOut, new ExecuteBinaryResponseHandler() {
            @Override
            public void onSuccess(String message) {
                Log.e(TAG, message);
            }

            @Override
            public void onProgress(String message) {
                Log.e(TAG, message);
            }

            @Override
            public void onFailure(String message) {
                Log.e(TAG, message);
            }

            @Override
            public void onStart() {
                Log.e(TAG, "onStart called");
            }

            @Override
            public void onFinish() {
                Log.e(TAG, "onFinish called");
            }
        });
    } catch (FFmpegCommandAlreadyRunningException ex) {
        Log.e(TAG, ex.getMessage());
    }
}


  



  Here is log data for your to understand. I am not that expert in that so I couldn't figure out what is wrong with my code. Path is correct and file is there. Maybe I am calling this command wrong or what ?

  



  I searched google and stack overflow much but nothing helped me solve it. Any help would be appreciated.

  



  04-20 12:08:26.050 12696-12696/com.example.myapplication E/Video to Mp3: Input File Path: 
/storage/emulated/0/Download/Ab.mp4
04-20 12:08:26.050 12696-12696/com.example.myapplication E/Video to Mp3: Output File Path: 
/storage/emulated/0/Download/Ab1.avi
04-20 12:08:26.050 12696-12696/com.example.myapplication E/Video to Mp3: Device not supported
04-20 12:08:26.050 12696-12696/com.example.myapplication E/Video to Mp3: onStart called
04-20 12:08:26.084 12696-13027/com.example.myapplication E/FFmpeg: Exception while trying to run: 
/data/user/0/com.example.myapplication/files/ffmpeg -i /storage/emulated/0/Download/Ab.mp4 
/storage/emulated/0/Download/Ab1.avi
java.io.IOException: Error running exec(). Command: [/data/user/0/com.example.myapplication/files/ffmpeg, -i, /storage/emulated/0/Download/Ab.mp4, /storage/emulated/0/Download/Ab1.avi] Working Directory: null Environment: null
    at java.lang.ProcessManager.exec(ProcessManager.java:211)
    at java.lang.Runtime.exec(Runtime.java:186)
    at java.lang.Runtime.exec(Runtime.java:259)
    at java.lang.Runtime.exec(Runtime.java:202)
    at com.github.hiteshsondhi88.libffmpeg.ShellCommand.run(ShellCommand.java:10)
    at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:38)
    at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:10)
    at android.os.AsyncTask$2.call(AsyncTask.java:307)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:246)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
    at java.lang.Thread.run(Thread.java:833)
 Caused by: java.io.IOException: No such file or directory
    at java.lang.ProcessManager.exec(Native Method)
    at java.lang.ProcessManager.exec(ProcessManager.java:209)
    at java.lang.Runtime.exec(Runtime.java:186) 
    at java.lang.Runtime.exec(Runtime.java:259) 
    at java.lang.Runtime.exec(Runtime.java:202) 
    at com.github.hiteshsondhi88.libffmpeg.ShellCommand.run(ShellCommand.java:10) 
    at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:38) 
    at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:10) 
    at android.os.AsyncTask$2.call(AsyncTask.java:307) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:246) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
    at java.lang.Thread.run(Thread.java:833) 
04-20 12:08:26.084 12696-12696/com.example.myapplication E/Video to Mp3: onFinish called