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• How to stop os.system() in Python ?

  30 septembre 2015, par 吴雨羲

  I want to stop the cmd command after 12 seconds. How to stop it ? My program doesn’t work.

  import multiprocessing
  
  import os
  
  import time
  
  
  
  
  
  def process():
  
      os.system('ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4')
  
  
  
  
  
  def stop():
  
      time.sleep(12)
  
  
  
  
  
  if __name__ == '__main__':
  
      p = multiprocessing.Process(target=process, args=())
  
      s = multiprocessing.Process(target=stop, args=())
  
      p.start()
  
      s.start()
  
      s.join()
  
      p.terminate()

  I change my program follow Pedro’s suggusetion @Pedro Lobito ,but it still doesn`t work.

  import shlex
  
  
  
  import subprocess
  
  import time
  
  
  
  command_line = 'ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4'
  
  
  
  proc = subprocess.Popen(shlex.split(command_line), shell=True)
  
  print '1' * 50
  
  time.sleep(2)  # <-- sleep for 12''
  
  print '2' * 50
  
  proc.terminate()  # <-- terminate the process
  
  print '3' * 50

  And the result in CMD is

  D:\wyx\workspace\python\ffrstp>python test1.py
  
  11111111111111111111111111111111111111111111111111
  
  ffmpeg version N-75563-g235381e Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
  le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
  able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
  
  ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
   --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
  
  e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-zlib
  
    libavutil      55.  2.100 / 55.  2.100
  
    libavcodec     57.  3.100 / 57.  3.100
  
    libavformat    57.  2.100 / 57.  2.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6.  8.100 /  6.  8.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, rtsp, from 'rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwc
  
  fbqjoo80j.sdp':
  
    Metadata:
  
      title           : RTSP Session
  
      comment         : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
  
  f5069bbf7)
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 352x288 [SAR 1:1 DAR 11
  
  :9], 10k tbr, 90k tbn, 10k tbc
  
  [mp4 @ 00bad520] Codec for stream 0 does not use global headers but container fo
  
  rmat requires global headers
  
  Output #0, mp4, to 'dump.mp4':
  
    Metadata:
  
      title           : RTSP Session
  
      comment         : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
  
  f5069bbf7)
  
      encoder         : Lavf57.2.100
  
      Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 352x288 [SAR 1:1 D
  
  AR 11:9], q=2-31, 10k tbr, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 00bad520] pts has no value
  
  [mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 0, current:
  
  0; changing to 1. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 1, current:
  
  0; changing to 2. This may result in incorrect timestamps in the output file.
  
  frame=   30 fps=0.0 q=-1.0 size=      63kB time=00:00:02.33 bitrate= 220.4kbits/
  
  frame=   36 fps= 31 q=-1.0 size=      68kB time=00:00:02.95 bitrate= 187.9kbits/
  
  frame=   42 fps= 24 q=-1.0 size=      73kB time=00:00:03.52 bitrate= 169.6kbits/
  
  frame=   47 fps= 20 q=-1.0 size=      90kB time=00:00:04.10 bitrate= 178.9kbits/
  
  frame=   53 fps= 19 q=-1.0 size=      95kB time=00:00:04.63 bitrate= 167.2kbits/
  
  22222222222222222222222222222222222222222222222222
  
  33333333333333333333333333333333333333333333333333
  
  
  
  D:\wyx\workspace\python\ffrstp>frame=   58 fps= 17 q=-1.0 size=      99kB time=0
  
  frame=   64 fps= 16 q=-1.0 size=     104kB time=00:00:05.72 bitrate= 149.0kbits/
  
  frame=   70 fps= 15 q=-1.0 size=     122kB time=00:00:06.36 bitrate= 156.7kbits/
  
  frame=   76 fps= 15 q=-1.0 size=     127kB time=00:00:06.92 bitrate= 150.2kbits/
  
  frame=   82 fps= 14 q=-1.0 size=     132kB time=00:00:07.55 bitrate= 143.2kbits/
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 7 packets
  
  frame=   86 fps= 13 q=-1.0 size=     135kB time=00:00:07.95 bitrate= 139.5kbits/
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 3 packets

  Maybe ffmpeg can reconnection. Can I stop it like ’Ctrl + C’ ?
  When I press ’Ctrl+C’,the result is

  22222222222222222222222222222222222222222222222222
  
  33333333333333333333333333333333333333333333333333
  
  
  
  D:\wyx\workspace\python\ffrstp>frame=   58 fps= 17 q=-1.0 size=      99kB time=0
  
  frame=   64 fps= 16 q=-1.0 size=     104kB time=00:00:05.72 bitrate= 149.0kbits/
  
  frame=   70 fps= 15 q=-1.0 size=     122kB time=00:00:06.36 bitrate= 156.7kbits/
  
  frame=   76 fps= 15 q=-1.0 size=     127kB time=00:00:06.92 bitrate= 150.2kbits/
  
  frame=   82 fps= 14 q=-1.0 size=     132kB time=00:00:07.55 bitrate= 143.2kbits/
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 7 packets
  
  frame=   86 fps= 13 q=-1.0 size=     135kB time=00:00:07.95 bitrate= 139.5kbits/
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 3 packets
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 1 packets
  
  frame=   89 fps= 13 q=-1.0 size=     138kB time=00:00:08.35 bitrate= 135.3kbits/
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 1 packets
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 3 packets
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 5 packets
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 3 packets
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 1 packets
  
  frame=   92 fps= 12 q=-1.0 size=     144kB time=00:00:09.15 bitrate= 128.7kbits/
  
  frame=   93 fps= 11 q=-1.0 size=     145kB time=00:00:09.58 bitrate= 123.8kbits/
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 1 packets
  
  [rtsp @ 00adb3e0] max delay reached. need to consume packet
  
  [NULL @ 00add8c0] RTP: missed 2 packets
  
  
  
  
  
  D:\wyx\workspace\python\ffrstp>[rtsp @ 00adb3e0] max delay reached. need to cons
  
  ume packet
  
  [NULL @ 00add8c0] RTP: missed 12 packets
  
  frame=   96 fps= 11 q=-1.0 size=     148kB time=00:00:10.43 bitrate= 116.2kbits/
  
  frame=   96 fps=9.2 q=-1.0 Lsize=     151kB time=00:00:10.43 bitrate= 118.3kbits
  
  /s
  
  video:148kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
  
  verhead: 1.913398%
  
  Exiting normally, received signal 2.

• fftools/ffmpeg_dec : stop accesing InputStream.fix_sub_duration

  17 janvier 2024, par Anton Khirnov

  fftools/ffmpeg_dec : stop accesing InputStream.fix_sub_duration
  Pass this information to dec_open() instead.
  This is a step towards decoupling Decoder and InputStream.
  

  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_dec.c
  • [DH] fftools/ffmpeg_demux.c

• How to make QProcess stop by button or keyboard in GUI ?

  31 août 2015, par xiaowei

  Here I want to make a recorder by ffmpeg.exe.

  And, I found the commend line, succeed running and generate the video file. And I know press "Esc" or "q" on keyboard can terminal

  Now, I want to use GUI to control the recoder(ffmpeg.exe). I select Qt here, and my work environment is windows 7 sp1.

  I use QProcess to execute it, you will see following.

  But I have no idea for terminal the process.

  The code list :
  main.cpp is simple.

  #include "mainwindow.h"
  
  #include <qapplication>
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      QApplication a(argc, argv);
  
      MainWindow w;
  
      w.show();
  
  
  
      return a.exec();
  
  }
  
  </qapplication>

  mainwindow.h

  #ifndef MAINWINDOW_H
  
  #define MAINWINDOW_H
  
  
  
  #include <qmainwindow>
  
  #include <qprocess>
  
  
  
  namespace Ui {
  
  class MainWindow;
  
  }
  
  
  
  class MainWindow : public QMainWindow
  
  {
  
      Q_OBJECT
  
  
  
  public:
  
      explicit MainWindow(QWidget *parent = 0);
  
      ~MainWindow();
  
  
  
  private:
  
      QProcess *pro;
  
      QString recorder;
  
      QString outputName;
  
      QString options;
  
  
  
  private slots:
  
      void startRecode();
  
      void stopRecode();
  
  };
  
  
  
  #endif // MAINWINDOW_H
  
  </qprocess></qmainwindow>

  mainwindow.cpp

  #include "mainwindow.h"
  
  
  
  #include <qprocess>
  
  #include <qtest>
  
  #include <qpushbutton>
  
  #include <qvboxlayout>
  
  
  
  MainWindow::MainWindow(QWidget *parent) :
  
      QMainWindow(parent),
  
      pro(new QProcess)
  
  {
  
      QDateTime current_date_time = QDateTime::currentDateTime();
  
      QString current_date = current_date_time.toString("yyyy-MM-dd-hh_mm_ss");
  
  
  
      recorder = "E:\\bin\\ffmpeg.exe";
  
      outputName = current_date + ".mp4";
  
      options = "-f gdigrab -framerate 6 -i desktop -vcodec libx264 -preset:v ultrafast -tune:v zerolatency -hide_banner -report";
  
      //-t 00:00:05"; this option can limit the process running time, and work well no GUI, but I don't want to use given time to stop recording.
  
  
  
      QWidget *centerWindow = new QWidget;
  
      setCentralWidget(centerWindow);
  
  
  
      QVBoxLayout *mainLayout = new QVBoxLayout;
  
      QPushButton *startButton = new QPushButton("start recording");
  
      QPushButton *stopButton = new QPushButton("stop recording");
  
      mainLayout->addWidget(startButton);
  
      mainLayout->addWidget(stopButton);
  
  
  
      centerWindow->setLayout(mainLayout);
  
  
  
      connect(startButton, SIGNAL(clicked()), this, SLOT(startRecode()));
  
      connect(stopButton, SIGNAL(clicked()), this, SLOT(stopRecode()));
  
  }
  
  
  
  MainWindow::~MainWindow()
  
  {
  
      delete pro;
  
  }
  
  
  
  void MainWindow::startRecode()
  
  {
  
      pro->execute(QString(recorder + " " +options +" " + outputName));
  
  }
  
  
  
  void MainWindow::stopRecode(){
  
      pro->terminate(); // not work
  
      //pro->close(); // not work, too
  
      //pro->kill(); // not work, T_T
  
  
  
      //how to terminate the process by pushbutton??
  
  }
  
  </qvboxlayout></qpushbutton></qtest></qprocess>

  There have some ideas for me ?

  or, have other solutions for my recorder ?