Wow, I think I got it, no errors, no segment fault:
Qt Code: 
  1. #ifndef FFMPEG_RUNNER_HPP
  2. #define FFMPEG_RUNNER_HPP
  3.  
  4. #include <QDebug>
  5. #include <QDir>
  6. #include <QFileInfo>
  7. #include <QProcess>
  8.  
  9. class MyFfmpegRunnerClass : public QObject {
  10. 	Q_OBJECT
  11. 	private:
  12. 		QProcess *process;
  13. 		QString srcdir;
  14. 		QString outdir;
  15. 		QString curr_file;
  16. 		bool delete_me;
  17. 		int n_files;
  18. 		QStringList files;
  19. 		int index;
  20. 	public:
  21. 		MyFfmpegRunnerClass(QObject *parent = 0) : QObject(parent)
  22. 		{
  23. 			/* init some values */
  24. 			n_files = 0;
  25. 			index = 0;
  26.  
  27. 			/* we should use one QProcess instance, thread safe? */
  28. 			process = new QProcess(this);			
  29. 			process->setStandardOutputFile("/dev/null");
  30. 			process->setStandardErrorFile("/dev/null");
  31. 			connect(process, SIGNAL(started()), this, SLOT(handleprocessStarted()));
  32. 			connect(process, SIGNAL(finished(int, QProcess::ExitStatus)), this, SLOT(handleprocessExited(int, QProcess::ExitStatus)));
  33. 			//connect(process, SIGNAL(finished(int)), process, SLOT(deleteLater())); <-- We don't need this, do we?
  34. 		}
  35.  
  36. 		void Start(const QString& _srcdir, const QString& _outdir, bool be_deleted = false) {
  37. 			/* grab values from parent's */
  38. 			srcdir = _srcdir;
  39. 			outdir = _outdir;
  40. 			delete_me = be_deleted;
  41. 			/* grab only selected files */
  42. 			QDir folder(srcdir);
  43. 			folder.setNameFilters(QStringList() << "*.mp3" << "*.mp4" << "*.flv" << "*.wav" << "*.ogg" << "*.3gp");
  44. 			files = folder.entryList(QDir::NoDotAndDotDot|QDir::Files);
  45. 			n_files = files.size(); // hold the number of them
  46. 			emit aJob();
  47. 			handleNewJob(); // begin a job
  48. 		}
  49.  
  50. 		~MyFfmpegRunnerClass() {
  51. 			/* ok, they kill us from parent's, so test if a process is running before a suicide */
  52. 			if (process && process->pid()) { // 
  53. 				process->close();
  54. 				delete process; // This is not a problem anymore :)
  55. 			}
  56. 			qDebug() << "Class ffmpeg died -_-";
  57. 		}
  58.  
  59. 	protected:
  60. 		void handleNewJob() {
  61. 			/* do we have some files for the job? */
  62. 			if (index < n_files) {
  63. 				QFileInfo fi(srcdir, files.at(index));
  64. 				QString file = fi.baseName() + ".mp3";
  65. 				curr_file = fi.absoluteFilePath();
  66. 				QString out_file = QDir(outdir).filePath(file);
  67. 				process->start("ffmpeg", QStringList() << "-i" << curr_file << "-f" <<  "mp3" << "-ab" << "128k" << out_file);
  68. 				qDebug() << "Converting: " << curr_file;
  69. 				index++;
  70. 			} else {
  71. 				emit noMoreJob();
  72. 			}
  73. 		}
  74.  
  75. 	protected slots:
  76. 		void handleprocessStarted() {
  77. 			emit startJob();
  78. 		}
  79.  
  80. 		void handleprocessExited(int exitCode, QProcess::ExitStatus exitStatus) {
  81. 			qDebug() << "Exited code: " << exitCode << ". ExitStatus: " << exitStatus;
  82. 			if ( (exitCode == 0) && (delete_me) ) {
  83. 				emit endJob();
  84. 				handleNewJob(); // look for more files
  85. 				// you should delete source file here below
  86. 			}
  87. 		}
  88.  
  89. 	signals:
  90. 		void aJob();
  91. 		void startJob();
  92. 		void noMoreJob();
  93. 		void endJob();
  94. };
  95.  
  96.  
  97. #endif
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Qt Code: 
  1. #ifndef TEST01_HPP
  2. #define TEST01_HPP
  3.  
  4. #include <QApplication>
  5. #include <QWidget>
  6. #include <QFileDialog>
  7. #include <QDir>
  8. #include <QDesktopServices> // Qt 4.2
  9. #include "ui_test01.h"
  10. #include "ffmpeg_runner.hpp"
  11.  
  12. namespace Ui {
  13. 	class Form;
  14. };
  15.  
  16. class MyForm : public QWidget {
  17. 	Q_OBJECT
  18. 	private:
  19. 		Ui::Form *ui;
  20. 		MyFfmpegRunnerClass *ffmpeg;
  21. 	public:
  22. 		MyForm(QWidget *root = 0) : QWidget(root), ui(new Ui::Form)
  23. 		{
  24. 			ui->setupUi(this);
  25.  
  26. 			/* below is beta, watch it!!! */
  27. 			ffmpeg = new MyFfmpegRunnerClass(this);
  28. 			connect(ffmpeg, SIGNAL(aJob()), this, SLOT(handleAJob()));
  29. 			connect(ffmpeg, SIGNAL(startJob()), this, SLOT(handleStart()));
  30. 			connect(ffmpeg, SIGNAL(endJob()), this, SLOT(handleEnd()));
  31. 			connect(ffmpeg, SIGNAL(noMoreJob()), this, SLOT(handleNoMoreJob()));
  32. 			/* ... */
  33.  
  34. 			connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(handleRunButton()));
  35. 			connect(ui->pushButton_3, SIGNAL(clicked()), this, SLOT(handleBrowseButton())); 
  36. 			ui->lineEdit->setText(QDesktopServices::storageLocation(QDesktopServices::MoviesLocation));
  37. 		}
  38. 		virtual ~MyForm() {
  39. 			delete ffmpeg;
  40. 			delete ui;
  41. 		}
  42.  
  43. 	protected slots:
  44. 		void handleBrowseButton() {
  45. 			QString folder = QFileDialog::getExistingDirectory(this);
  46. 			if (!folder.isEmpty()) ui->lineEdit->setText(folder);
  47. 		}
  48.  
  49. 		void handleRunButton() {
  50. 			QString source_dir = ui->lineEdit->text();
  51. 			QString target_dir = QDesktopServices::storageLocation(QDesktopServices::MusicLocation);
  52. 			bool delete_me = true;
  53. 			ffmpeg->Start(source_dir, target_dir, delete_me);
  54. 		}
  55.  
  56. 		void handleStart() {
  57. 			qDebug() << "We have a new job";
  58. 		}
  59.  
  60. 		void handleEnd() {
  61. 			qDebug() << "We don't have the job";
  62. 		}
  63.  
  64. 		void handleAJob() {
  65. 			qDebug() << "We should disable some stuff here";
  66. 		}
  67.  
  68. 		void handleNoMoreJob() {
  69. 			qDebug() << "We should enable some stuff here";
  70. 		}
  71.  
  72. };
  73.  
  74. #endif
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in your opinion, everything is ok? No memory leaks?