java - ffmpeg命令不适用于Android中目录路径的空白

Question

我正在使用 FFMPEG我想在其中使用这个库来旋转视频的库，如果我是 file path，它可以正常工作没有任何white space .但是在我的情况下，我有视频目录的空白(您可以在 String commandStr onPreExecute() 的 asynctask 方法中看到完整路径)路径，那么它根本不起作用。我也看到过类似的问题 this还有一些但不知道如何正确解决它。下面是我的 MainActivity.class 代码

    public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    String workFolder = null;
    String demoVideoFolder = null;
    String vkLogPath = null;
    private boolean commandValidationFailedFlag = false;

    private Button btnRun;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GeneralUtils.checkForPermissionsMAndAbove(MainActivity.this, true);


        setIds();
        setListner();


        demoVideoFolder = Environment.getExternalStorageDirectory().getAbsolutePath() + "/videokit/";

        Log.i(Prefs.TAG, getString(R.string.app_name) + " version: " + GeneralUtils.getVersionName(getApplicationContext()) );
        workFolder = getApplicationContext().getFilesDir().getAbsolutePath() + "/";
        vkLogPath = workFolder + "vk.log";

        GeneralUtils.copyLicenseFromAssetsToSDIfNeeded(this, workFolder);
        GeneralUtils.copyDemoVideoFromAssetsToSDIfNeeded(this, demoVideoFolder);


        int rc = GeneralUtils.isLicenseValid(getApplicationContext(), workFolder);
        Log.i(Prefs.TAG, "License check RC: " + rc);
    }

    private void setListner() {
        btnRun.setOnClickListener(this);
    }

    private void setIds() {
        try {
            btnRun =  (Button)findViewById(R.id.btnRun);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.btnRun:

                Log.i(Prefs.TAG, "run clicked.");
                if (GeneralUtils.checkIfFileExistAndNotEmpty(workFolder)) {
                    new TranscdingBackground(MainActivity.this).execute();
                }
                else {
                    Toast.makeText(getApplicationContext(), workFolder + " not found", Toast.LENGTH_LONG).show();
                }
                break;
        }
    }

    public class TranscdingBackground extends AsyncTask<String, Integer, Integer>
    {

        ProgressDialog progressDialog;
        Activity _act;
        String commandStr;

        public TranscdingBackground (Activity act) {
            _act = act;
        }



        @Override
        protected void onPreExecute() {

//            commandStr = "ffmpeg -y -i /storage/emulated/0/WhatsApp/Media/in.mp4 -vf rotate=270*(PI/180) /sdcard/videokit/out.mp4";
            commandStr = "ffmpeg -y -i /storage/emulated/0/WhatsApp/Media/WhatsApp Video/in.mp4 -vf rotate=270*(PI/180) /sdcard/videokit/out.mp4";


            progressDialog = new ProgressDialog(_act);
            progressDialog.setMessage("FFmpeg4Android Transcoding in progress...");
            progressDialog.show();

        }

        protected Integer doInBackground(String... paths) {
            Log.i(Prefs.TAG, "doInBackground started...");

            // delete previous log
            boolean isDeleted = GeneralUtils.deleteFileUtil(workFolder + "/vk.log");
            Log.i(Prefs.TAG, "vk deleted: " + isDeleted);

            PowerManager powerManager = (PowerManager)_act.getSystemService(Activity.POWER_SERVICE);
            PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "VK_LOCK");
            Log.d(Prefs.TAG, "Acquire wake lock");
            wakeLock.acquire();



            LoadJNI vk = new LoadJNI();
            try {

                vk.run(GeneralUtils.utilConvertToComplex(commandStr), workFolder, getApplicationContext());

                // copying vk.log (internal native log) to the videokit folder
                GeneralUtils.copyFileToFolder(vkLogPath, demoVideoFolder);

            } catch (CommandValidationException e) {
                Log.e(Prefs.TAG, "vk run exeption.", e);
                commandValidationFailedFlag = true;

            } catch (Throwable e) {
                Log.e(Prefs.TAG, "vk run exeption.", e);
            }
            finally {
                if (wakeLock.isHeld())
                    wakeLock.release();
                else{
                    Log.i(Prefs.TAG, "Wake lock is already released, doing nothing");
                }
            }
            Log.i(Prefs.TAG, "doInBackground finished");
            return Integer.valueOf(0);
        }

        protected void onProgressUpdate(Integer... progress) {
        }

        @Override
        protected void onCancelled() {
            Log.i(Prefs.TAG, "onCancelled");
            //progressDialog.dismiss();
            super.onCancelled();
        }


        @Override
        protected void onPostExecute(Integer result) {
            Log.i(Prefs.TAG, "onPostExecute");
            progressDialog.dismiss();
            super.onPostExecute(result);

            // finished Toast
            String rc = null;
            if (commandValidationFailedFlag) {
                rc = "Command Vaidation Failed";
            }
            else {
                rc = GeneralUtils.getReturnCodeFromLog(vkLogPath);
            }
            final String status = rc;
            MainActivity.this.runOnUiThread(new Runnable() {
                public void run() {
                    Toast.makeText(MainActivity.this, status, Toast.LENGTH_LONG).show();
                    if (status.equals("Transcoding Status: Failed")) {
                        Toast.makeText(MainActivity.this, "Check: " + vkLogPath + " for more information.", Toast.LENGTH_LONG).show();
                    }
                }
            });
        }
    }

}

这里 onPreExecute()方法我已经给出了视频文件路径。

Answer 1

我的事情，因为你做了一个命令行调用，你需要这些:

转义一些特殊字符 (就像你在命令行上也需要)

引用文件名 (比你需要在文件名中转义引号)