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• 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.

• Revision 223bf29307 : libyuv : update to r1305 MIPS build fixes https://code.google.com/p/webm/issues

  3 mars 2015, par Johann

  Changed Paths :
   Modify /third_party/libyuv/README.libvpx

  
   Modify /third_party/libyuv/include/libyuv/compare.h

  
   Modify /third_party/libyuv/include/libyuv/convert.h

  
   Modify /third_party/libyuv/include/libyuv/convert_argb.h

  
   Modify /third_party/libyuv/include/libyuv/convert_from.h

  
   Modify /third_party/libyuv/include/libyuv/convert_from_argb.h

  
   Delete /third_party/libyuv/include/libyuv/format_conversion.h

  
   Modify /third_party/libyuv/include/libyuv/row.h

  
   Modify /third_party/libyuv/include/libyuv/scale.h

  
   Modify /third_party/libyuv/include/libyuv/scale_row.h

  
   Modify /third_party/libyuv/include/libyuv/version.h

  
   Modify /third_party/libyuv/include/libyuv/video_common.h

  
   Modify /third_party/libyuv/source/compare.cc

  
   Modify /third_party/libyuv/source/compare_neon.cc

  
   Add /third_party/libyuv/source/compare_neon64.cc

  
   Modify /third_party/libyuv/source/compare_posix.cc

  
   Modify /third_party/libyuv/source/compare_win.cc

  
   Modify /third_party/libyuv/source/convert.cc

  
   Modify /third_party/libyuv/source/convert_argb.cc

  
   Modify /third_party/libyuv/source/convert_from.cc

  
   Modify /third_party/libyuv/source/convert_from_argb.cc

  
   Modify /third_party/libyuv/source/convert_to_argb.cc

  
   Modify /third_party/libyuv/source/convert_to_i420.cc

  
   Modify /third_party/libyuv/source/cpu_id.cc

  
   Delete /third_party/libyuv/source/format_conversion.cc

  
   Modify /third_party/libyuv/source/mjpeg_validate.cc

  
   Modify /third_party/libyuv/source/planar_functions.cc

  
   Modify /third_party/libyuv/source/rotate.cc

  
   Modify /third_party/libyuv/source/rotate_argb.cc

  
   Modify /third_party/libyuv/source/rotate_neon.cc

  
   Add /third_party/libyuv/source/rotate_neon64.cc

  
   Modify /third_party/libyuv/source/row_any.cc

  
   Modify /third_party/libyuv/source/row_common.cc

  
   Modify /third_party/libyuv/source/row_mips.cc

  
   Modify /third_party/libyuv/source/row_neon.cc

  
   Modify /third_party/libyuv/source/row_neon64.cc

  
   Modify /third_party/libyuv/source/row_posix.cc

  
   Modify /third_party/libyuv/source/row_win.cc

  
   Modify /third_party/libyuv/source/scale.cc

  
   Modify /third_party/libyuv/source/scale_argb.cc

  
   Modify /third_party/libyuv/source/scale_common.cc

  
   Modify /third_party/libyuv/source/scale_neon.cc

  
   Modify /third_party/libyuv/source/scale_neon64.cc

  
   Modify /third_party/libyuv/source/scale_posix.cc

  
   Modify /third_party/libyuv/source/scale_win.cc

  
   Modify /third_party/libyuv/source/video_common.cc

  
  
  libyuv : update to r1305

  MIPS build fixes

  https://code.google.com/p/webm/issues/detail?id=957

  Change-Id : I9d53900af36d783c369b5dff27a7479cb94fd16b

• Why are rectangular boxes ([]) showing instead of text in burned subtitles when using ffmpeg/MoviePy on Google Colab ?

  14 mai, par Lavish

  I'm working on a Python script that adds subtitles to a video using MoviePy and burns/hardcodes them directly onto the video. The subtitles contain Hindi text, and I’ve specified a custom font that supports Devanagari (Hindi) script.

  


  The code works perfectly fine on my local machine, the subtitles appear correctly with Hindi characters. However, when I run the same code on Google Colab, the subtitles display as rectangular boxes (something like this -> [][][]) instead of proper characters.

  


  Things I've tried :

  


  

  • Ensured the font used supports Hindi (I'm using NotoSansDevanagari-Regular.ttf renamed as font.ttf).

  


  • Uploaded the font to Colab and specified the full path correctly.

  


  • Verified that the text is passed as a proper Unicode string.

  


  


  Here's the code snippet :

  


  def add_subtitles(video_path, subtitles_path, output_path):
    """Adds subtitles using FFmpeg with proper path escaping."""
    # Convert to absolute paths and normalize
    
    video_path = os.path.abspath(video_path)
    subtitles_path = os.path.abspath(subtitles_path)
    output_path = os.path.abspath(output_path)


    # Subtitle path
    font_path = "input_files/font.ttf"
    font_path = os.path.abspath(font_path).replace("\\", "\\\\")
    subtitles_path_escaped = os.path.abspath(subtitles_path).replace("\\", "\\\\")
    
    # Escape backslashes in paths
    subtitles_path = subtitles_path.replace("\\", "\\\\")
    # Remove all files in final_videos
    [os.remove(os.path.join(base_dir, "final_videos", f)) for f in os.listdir(os.path.join(base_dir, "final_videos")) if os.path.isfile(os.path.join(base_dir, "final_videos", f))]

    os.makedirs(os.path.dirname(output_path), exist_ok=True)
    escaped_path = subtitles_path.replace(':', '\\:').replace('\\', '\\\\')

    cmd = [
    "ffmpeg",
    "-i", video_path,
    "-vf", f"subtitles={escaped_path}:force_style='FontFile={font_path}'",
    "-c:v", "libx264",
    "-c:a", "copy",
    "-preset", "fast",
    "-crf", "22",
    output_path
]


    # Debug: Print the exact command being executed
    print("Executing:", " ".join(cmd))
    try:
        subprocess.run(cmd, check=True, capture_output=True, text=True)
        print(f"✅ Success! Output saved to: {output_path}")
    except subprocess.CalledProcessError as e:
        print(f"❌ FFmpeg failed with error:\n{e.stderr}")



  


  What could be causing this issue on Colab, and how can I get non-English subtitles (like Hindi) to render properly when burning subtitles using MoviePy/ffmpeg in a Colab environment ?