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• Python opencv subprocess write return broken pipe

  16 septembre 2021, par Vamsi

  I want to read an rtsp video source, add overlay text and push it to the RTMP endpoint.I am using Videocapture to read the video source and python subprocess to write the frames back to RTMP endpoint. I referred this FFmpeg stream video to rtmp from frames OpenCV python

  


  import sys
import subprocess

import cv2
import ffmpeg
rtmp_url = "rtmp://127.0.0.1:1935/live/test"

path = 0
cap = cv2.VideoCapture("rtsp://10.0.1.7/media.sdp")

# gather video info to ffmpeg
fps = int(cap.get(cv2.CAP_PROP_FPS))
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))



command = ['ffmpeg', '-i', '-', "-c", "copy", '-f', 'flv', rtmp_url]
p = subprocess.Popen(command, stdin=subprocess.PIPE, stderr=subprocess.PIPE, stdout=subprocess.PIPE)

font = cv2.FONT_HERSHEY_SIMPLEX
while cap.isOpened():

    ret, frame = cap.read()
    cv2.putText(frame, 'TEXT ON VIDEO', (50, 50), font, 1, (0, 255, 255), 2, cv2.LINE_4)
    cv2.imshow('video', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

    if not ret:
        print("frame read failed")
        break

    try:
        p.stdin.write(frame.tobytes())
    except Exception as e:
        print (e)


cap.release()
p.stdin.close()
p.stderr.close()
p.wait()


  


  The python script returns "[Errno 32] Broken pipe". Running the ffmpeg command in the terminal works fine.

  


  


  ffmpeg -i rtsp ://10.0.1.7/media.sdp -c copy -f flv
rtmp ://127.0.0.1:1935/live/test

  


  


  The above command works fine, and I can push the input stream to RTMP endpoint. But I can't write processed frame to subprocess which has ffmpeg running.

  


  Please let me know, if I miss anything.

  


• Join us for the Piwik Community Meetup 2015 !

  25 juin 2015, par Piwik Core Team — Community, Meta

  

  We’re excited to announce that our third Piwik Community Meetup will be held in Berlin on Tuesday, the 4th of August, 2015. Don’t miss this great opportunity to connect with other users and meet the core team behind Piwik. It’s free, so REGISTER TODAY ! And maybe you would like to share your Piwik use case ? We’re also waiting for your presentation ideas.

  We will cover some of the upcoming features, discuss the future of Piwik, share tricks and hacks to help you get the most out of your Piwik platform, and socialise. If you use Piwik to improve your websites and apps, or are just generally curious about digital analytics and marketing – this event is not to be missed. As our core team is scattered all over the world, this will be a rare opportunity for you to meet and talk to us all at once – especially for those of you interested in the platform, integrating your app with Piwik, and building plugins.

  After the official part, we would like to enjoy drinks with all the participants in the nearby bars. We hope you will be able to join us !

  All Piwik community members are warmly invited to take part in the meetup !

  Piwik Community Meetup 2015

  When ?

  Tuesday, the 4th of August, from 5-9pm

  Where ?

  Kulturbrauerei
  Schönhauser Allee
  Prenzlauer Berg area
  Berlin, Germany
  exact directions tbc.

  Languages :

  English and German

  Book tickets :

  BOOK YOUR FREE INVITATION HERE

  Open call for YOUR presentation ideas

  We would also like to hear how you use Piwik – we’ll be delighted if you’d share your interesting use case during the Meetup. Please send your presentation ideas (speaking time : 5 to 7 minutes) to : meetup@piwik.pro ! Deadline : 20th of July 2015.

  Contact the organisers :

  meetup@piwik.pro

• Join us for the Piwik Community Meetup 2015 !

  25 juin 2015, par Piwik Core Team — Community, Meta

  

  We’re excited to announce that our third Piwik Community Meetup will be held in Berlin on Tuesday, the 4th of August, 2015. Don’t miss this great opportunity to connect with other users and meet the core team behind Piwik. It’s free, so REGISTER TODAY ! And maybe you would like to share your Piwik use case ? We’re also waiting for your presentation ideas.

  We will cover some of the upcoming features, discuss the future of Piwik, share tricks and hacks to help you get the most out of your Piwik platform, and socialise. If you use Piwik to improve your websites and apps, or are just generally curious about digital analytics and marketing – this event is not to be missed. As our core team is scattered all over the world, this will be a rare opportunity for you to meet and talk to us all at once – especially for those of you interested in the platform, integrating your app with Piwik, and building plugins.

  After the official part, we would like to enjoy drinks with all the participants in the nearby bars. We hope you will be able to join us !

  All Piwik community members are warmly invited to take part in the meetup !

  Piwik Community Meetup 2015

  When ?

  Tuesday, the 4th of August, from 5-9pm

  Where ?

  Kulturbrauerei
  Schönhauser Allee
  Prenzlauer Berg area
  Berlin, Germany
  exact directions tbc.

  Languages :

  English and German

  Book tickets :

  BOOK YOUR FREE INVITATION HERE

  Open call for YOUR presentation ideas

  We would also like to hear how you use Piwik – we’ll be delighted if you’d share your interesting use case during the Meetup. Please send your presentation ideas (speaking time : 5 to 7 minutes) to : meetup@piwik.pro ! Deadline : 20th of July 2015.

  Contact the organisers :

  meetup@piwik.pro