Recherche avancée

Sur d’autres sites (9657)

• How to make use of "&" command in TCL version 8.0 to make a proc or exec command run in background i.e in parallel on windows 7 ?

  21 novembre 2017, par M. D. P

  I am working on a project where I am using FFMPEG to capture video. The FFMPEG command is :

  ffmpeg -f dshow  -t 00:00:10 -i "video=Integrated Webcam" -b 5000k -s 1280x720 c:/test/sample.avi

  The link : https://www.tcl.tk/man/tcl8.5/tutorial/Tcl26.html make the use of the command :

  exec myprog &

  Here they have not specified what is myprog.

  The link : Running shell commands in background, in a tcl proc make the use of command :

   eval exec [linsert $args 0 exec] >> $tempFile &

  Here the command is not accepted as eval and exec is one after another, so it takes exec as a variable.

  Help me, with the write right command which can be used to capture my video in the background with TCL version 8.0 and Windows 7.

• openCV save frames from RTSP non blocking

  1er janvier 2020, par Jacob nighFor

  I am building an app that records frames from IP camera through RTSP.

  My engine is in charge to save a video in mp4 with Opencv VideoWriter working well.
  What I am looking for is to create a startRecord and a stopRecord class method that will respectively start and stop recording according to a trigger (it could be an argument that I pass to the thread).
  Is anyone know what the best way to do that kind of stuff ?

  Here is my class :

  from threading import Thread
  
  import cv2
  
  import time
  
  import multiprocessing
  
  import threading
  
  class RTSPVideoWriterObject(object):
  
      def __init__(self, src=0):
  
          # Create a VideoCapture object
  
          self.capture = cv2.VideoCapture(src)
  
  
  
          # Start the thread to read frames from the video stream
  
          self.thread = Thread(target=self.update, args=())
  
          self.thread.daemon = True
  
          self.thread.start()
  
  
  
      def update(self):
  
          # Read the next frame from the stream in a different thread
  
          while True:
  
              if self.capture.isOpened():
  
                  (self.status, self.frame) = self.capture.read()
  
  
  
      def endRecord(self):
  
          self.capture.release()
  
          self.output_video.release()
  
          exit(1)
  
  
  
      def startRecord(self,endRec):
  
  
  
          self.frame_width = int(self.capture.get(3))
  
          self.frame_height = int(self.capture.get(4))
  
          self.codec = cv2.VideoWriter_fourcc(*'mp4v')
  
          self.output_video = cv2.VideoWriter('fileOutput.mp4', self.codec, 30, (self.frame_width, self.frame_height))
  
          while True:          
  
              try:
  
                  self.output_video.write(self.frame)
  
                  if endRec:
  
                      self.endRecord()
  
              except AttributeError:
  
                  pass
  
  
  
  
  
  
  
  
  
  if __name__ == '__main__':
  
  
  
      rtsp_stream_link = 'rtsp://foo:192.5545....'
  
      video_stream_widget = RTSPVideoWriterObject(rtsp_stream_link)
  
  
  
      stop_threads = False
  
      t1 = threading.Thread(target = video_stream_widget.startRecord, args =[stop_threads]) 
  
      t1.start() 
  
      time.sleep(15)
  
      stop_threads = True

  As you can see in the main I reading frames and store them in a separate thread. Then I am starting to record (record method is with an infinite loop so blocking) and then after 15 sec, I am trying to pass a ’stop_record’ argument to stop recording properly.

  A part of the code comes from Storing RTSP stream as video file with OpenCV VideoWriter

  Is someone have an idea ?
  I read a lot that OpenCV can be very tricky for multithreading

  N.

• How to save youtube audio url (m4a/webm) as mp3 Using php ? [closed]

  7 janvier 2020, par Mwt Lakshan

  How to save youtube audio url (m4a/webm) as mp3 using php ?

  example Url :

  https://r2---sn-i0ujipnvoa3-jhce.googlevideo.com/videoplayback?expire=1578399021&ei=zSAUXuSdB4KF6dsPzNGDyAM&ip=2.59.21.100&id=o-AKoE21DucyryFuMknp7oovg7sriugDO95Y6DV5E_ewYI&itag=251&source=youtube&requiressl=yes&mime=audio%2Fwebm&gir=yes&clen=3087360&dur=170.781&lmt=1578224519515749&fvip=5&keepalive=yes&fexp=23842630&c=WEB&txp=5531432&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&s=o%3DAJ25zxswXZhCv-jK_5n7tA1AcJHx9fUzcAJxz1F4kepBiAc98%3D_E2jlms3LFtk5U-CNgLq4eG4Ocd0at8Oi19UC1PAhIQRww2IxgLAD&sp=sig&title=+Full+Video_+Habibi+ke+Nain++DABANGG+3++Salman+Khan%2C+Sonakshi+S+_+Shreya%2C+Jubin+_Sajid+Wajid+&ratebypass=yes&sig=ALgxI2wwRQIhAP1CU91iO8ta0dcO4Ge4qLgNC-U5DtFL3smlj2E_o89cAiBpek4F1zxJkczUf9xHJcA1At7n5_Kj-vChZXwsxz52JA%3D%3D&cms_redirect=yes&mip=45.121.88.125&mm=31&mn=sn-i0ujipnvoa3-jhce&ms=au&mt=1578377583&mv=m&mvi=1&pl=24&lsparams=mip,mm,mn,ms,mv,mvi,pl&lsig=AHylml4wRgIhAKeVFZYOk3JQ1Owlx-y1jaBfS1_NJBm6ZMlcfaSAvoN0AiEArzcj5cDCAJ_YtjQu4mpomJsFaBjM8Uk14bZlzVu