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• Build OpenCv using static ffmpeg library

  24 juillet 2020, par gaurav agarwal

  I am trying to build opencv for one of the commercial product. That commercial product already contains a static build of ffmpeg executable. While building OpenCv I am seeing bunch of failure most probably due to linking issues with ffmpeg.

  


  Is it possible to build OpenCv using static ffmpeg library ? In OpenCv installation doc I can see mentioned prerequisite is :

  


  


  ffmpeg or libav development packages : libavcodec-dev, libavformat-dev,
libswscale-dev

  


  


  I guess this means OpenCv needs these lib to be present as shared libs. Any expert opinion will be helpful !!!

  


• 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


  


• Using ffmpeg with an audio input from System.IO.Stream

  17 juillet 2020, par kevingoos

  So I am creating a project where I need to convert audio comming from azure text to speech.
  
I wanted to use ffmpeg for this, but I am not an expert with all these parameters.
So far I alread got it working where I read from a $.wav file and convert it to an output System.IO.Stream comming from ffmpeg.

  


  But I want to change it that I don't always save a wav file to disk. Instead now I get a System.IO.Stream from azure text to speech, but I have no clue for the params and the documentation is not really clear for me...

  


  var azureAudio = await new AzureSpeechService().Speak(text);

var psi = new ProcessStartInfo
{
    FileName = @"C:\ffmpeg-20200715-a54b367-win64-static\bin\ffmpeg.exe",
    Arguments = "-i pipe:0 -ac 2 -f s16le -ar 48000 pipe:1",
    RedirectStandardOutput = true,
    UseShellExecute = false
};
var ffmpeg = Process.Start(psi);

var inputStream = ffmpeg.StandardInput.BaseStream;

azureAudio.CopyTo(inputStream);

inputStream.Flush();
inputStream.Close();

var outputStream = ffmpeg.StandardOutput.BaseStream;
await SendAudioAsync(client, outputStream);