我正在使用FFMPEG库，我希望使用此库旋转视频，如果我file path没有任何white space，则可以正常工作。但在我的情况下，我有视频目录的空白区域（您可以在String commandStr onPreExecute()路径的asynctask 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();
}
}
});
}
}
}
方法中查看完整路径，然后它根本不起作用。我也看到过像this这样的问题，还有一些问题，但不知道如何正确解决它。下面是我的MainActivity.class代码
onPreExecute()此处with open(sys.argv[1]) as inputfile:
for line in inputfile:
print(line)
方法我已经提供了视频文件路径。
答案 0 :(得分：0)
因为你进行了命令行调用，所以你需要这些：
转义一些特殊字符（就像您在命令行中所需要的那样）
引用文件名（比你需要在文件名中转义引号）
答案 1 :(得分：0)
只需将命令从String转换为ArrayList，如下所示：
commandStr = "ffmpeg -y -i /storage/emulated/0/WhatsApp/Media/WhatsApp Video/in.mp4 -vf rotate=270*(PI/180) /sdcard/videokit/out.mp4";
ArrayList<String> arrayList = new ArrayList<>();
arrayList.add("ffmpeg");
arrayList.add("-y");
arrayList.add("-i");
arrayList.add("/storage/emulated/0/WhatsApp/Media/WhatsApp Video/in.mp4");
arrayList.add("-vf");
arrayList.add("rotate=270*(PI/180)");
arrayList.add("/sdcard/videokit/out.mp4");
并更改你的vk.run（）;方法如下：
vk.run(GeneralUtils.utilConvertToComplex(commandStr), workFolder, getApplicationContext());
vk.run(arrayList.toArray(new String[arrayList.size()]), workFolder, getApplicationContext());