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• Consume Flask video streaming with ffmpeg

  10 avril 2018, par Vitor Silva de Deus

  I’ve created a python Flask video file streamer resource that works well when getting the file in a web browser but is not working when using ffmpeg.
  The flask resource is :

  from flask_restful import Resource, Api
  
  
  
  class Mp4(Resource):
  
      def get(self,grtv,data,canal,arquivo):
  
  
  
          path = os.path.abspath('../mp4/' + str(canal) + '/' + str(data) + '/' + str(arquivo))
  
  
  
          print(path)
  
          def generate():
  
              with open(path, "rb") as f:
  
                  chunk = f.read(1024)
  
                  while chunk:
  
                      yield chunk
  
                      chunk = f.read(1024)
  
  
  
          try:
  
              t = os.stat(path)
  
              size = str(t.st_size)
  
              return Response(generate(),mimetype='video/mp4',headers={"Content-Type":"video/mp4","Content-Disposition":"inline","Content-Transfer-Enconding":"binary","Content-Length":size})
  
          except Exception as e:
  
              result = {'result': e}
  
              return result

  The ffmpeg command is :

  ffmpeg -loglevel debug -i <url> out_teste4.mp4
  
  </url>

  where url is de address of the streaming video.

  The ffmpeg most important output is :

  ffmpeg output screenshot 1

  ffmpeg output screenshot 2

  I’ve already tried increasing ’analyzeduration’ and ’probesize’ options.

  ffmpeg version : 3.4.2-1 16.04.york0.2.

  python version : 3.5.2.

  Does anyone can help me to get the video files with ffmpeg ? Suggestions can be both on changing the API or the ffmpeg command.

  Thank you all !

• OpenCV VideoCapture closes with videos from GoPro

  10 février 2021, par Michael

  I have a videofile from a GoPro device and I simply work with it from a VideoCapture like this :

  



  cap = cv2.VideoCapture(path)
        index = 0
        start = time.time()

        while cap.isOpened():
            ret, frame = cap.read()
            if not ret:
                break
            # do something here
        end = time.time()


  



  It is very weird, but I can operate with any files except ones, captured at the GoPro. Stream just closes at some point because ret value becomes False and frame becomes None. No exceptions or anything else.

  



  Googling helped me to find this question. I have deleted audio streams from file with ffmpeg tool and then everything works just fine. So why it is like so ? Pleas help !

  



  I am using Python 3.6.4 x64, Windows 10 (however at Linux same) and precompiled binaries for OpenCV from this resource.

  


• How to Merge two videos without re-encoding [duplicate]

  2 février, par Yogesh Agarwal

  I am trying to Merge two video without re-encoding them.

  



  Currently i use a approach which is too much time consuming and resource as well. I just want to merge without re-encoding them. Currently i am using

  



          exec ( "cpulimit -l 90 ffmpeg -i $filename1 -qscale 0  $intermediate1 &> stream1.log" );
        exec ( "cpulimit -l 90 ffmpeg -i $filename2 -qscale 0  $intermediate2 &> stream2.log" );
        $output = '/var/www/html/myserver/merg/'.uniqid().'_merge.'.$ext;
        exec ( "cpulimit -l 90 cat $intermediate1 $intermediate2 | ffmpeg -i - -qscale 0 $output &> stream3.log" );


  



  Above takes a lot of time.. I want a quick way to do it.