FFmpeg ffmpeg = FFmpeg.getInstance(context);
try {
  ffmpeg.loadBinary(new LoadBinaryResponseHandler() {

    @Override
    public void onStart() {}

    @Override
    public void onFailure() {}

    @Override
    public void onSuccess() {}

    @Override
    public void onFinish() {}
  });
} catch (FFmpegNotSupportedException e) {
  // Handle if FFmpeg is not supported by device
}

三、接著就可以執(zhí)行命令了，例如下面的cmd

FFmpeg ffmpeg = FFmpeg.getInstance(context);
try {
  // to execute "ffmpeg -version" command you just need to pass "-version"
  ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {

    @Override
    public void onStart() {}

    @Override
    public void onProgress(String message) {}

    @Override
    public void onFailure(String message) {}

    @Override
    public void onSuccess(String message) {}

    @Override
    public void onFinish() {}
  });
} catch (FFmpegCommandAlreadyRunningException e) {
  // Handle if FFmpeg is already running
}

這里以給視頻加水印為例：

val convertedFile = getConvertedFile(inFile!!)//輸出文件路徑
val cmd = arrayOf(
    "-y",
    "-i",
    inFile!!.path,
    "-i",
    watermarkFile!!.absolutePath,
    "-filter_complex",
    "[0:v][1:v]overlay=main_w-overlay_w-10:10",
    "-vcodec",
    "libx264",
    "-codec:a",
    "copy",
    convertedFile.path
)
try {
    FFmpeg.getInstance(context).execute(cmd, object : FFmpegExecuteResponseHandler {
        override fun onStart() {}
        override fun onProgress(message: String) {
            Log.e("TAg", "水?。?message")
        }
        override fun onSuccess(message: String) {
            Log.e("TAg", "成功：$message")
            inFile?.delete();
            watermarkFile?.delete();
            callback?.onSuccess(convertedFile)
        }

        override fun onFailure(message: String) {
            callback?.onFailure(IOException(message))
        }

        override fun onFinish() {
            Log.e("TAg", "結束")
        }
    })
} catch (e: Exception) {
    callback?.onFailure(e)
}

這里對用到的命令做個簡單的解釋：

-y 覆蓋輸出文件
-I filename 輸入文件，注：這里用到兩個輸入文件，分別是視頻文件和水印圖片文件
-filter_complex “濾鏡圖” 多輸入濾鏡，濾鏡圖包含多個濾鏡鏈，分號分隔；濾鏡鏈包含多個濾鏡，逗號分隔其中overlay=X:Y 覆蓋視頻，需要兩個輸入，第二個覆蓋在第一個上面的位置(X,Y), Y可以省略，[0:v][1:v]是第一第二兩個輸入的引用，作為輸入的指令