Recherche avancée

Sur d’autres sites (7165)

• vvcdec : add CTU parser

  5 décembre 2023, par Nuo Mi

  vvcdec : add CTU parser
  Co-authored-by : Xu Mu <toxumu@outlook.com>
  
  Co-authored-by : Frank Plowman <post@frankplowman.com>
  
  Co-authored-by : Shaun Loo <shaunloo10@gmail.com>
  
  Co-authored-by : Wu Jianhua <toqsxw@outlook.com>
  

  • [DH] libavcodec/vvc/vvc_ctu.c
  • [DH] libavcodec/vvc/vvc_ctu.h

• Stream OpenCV frames to http using ffmpeg

  15 mars 2023, par Christoph Meyer

  I have a small Python OpenCV project and would like to stream my processed frames to HTTP using ffmpeg.

  


  For this I used the following sources :
Pipe and OpenCV to FFmpeg with audio streaming RTMP in Python
and
https://github.com/kkroening/ffmpeg-python/blob/master/examples/README.md#stream-from-a-local-video-to-http-server

  


  To make things more readable I used the ffmpeg-python library but as far as I understand, it doesn't matter if I open a pipe using subprocess or use the library.

  


  The problem that I have is, that I always get a broken pipe or "Connection refused" when I open the stream with ffplay.

  


  import ffmpeg
import cv2

video_format = "flv"
server_url = "http://localhost:8080"

cap = cv2.VideoCapture(1)
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))


process = (
    ffmpeg
    .input('pipe:', format='rawvideo',codec="rawvideo", pix_fmt='bgr24', s='{}x{}'.format(width, height))
    .output(
        server_url,
        #codec = "copy", # use same codecs of the original video
        listen=1, # enables HTTP server
        codec="libx264",
        pix_fmt="yuv420p",
        preset="ultrafast",
        f=video_format)
    .overwrite_output()
    .run()
)

while True:
    ret, frame = cap.read()
    if not ret:
        break
    print("Sending frame")
    process.stdin.write(frame.tobytes())


  


  I also tried to stream using only ffmpeg and FaceTime and that works as i expected.

  


  My operation system is MacOS 12.3

  


  Maybe someone knows how to fix this.

  


  Thanks for your help

  


  Chris

  


• Processing Camera stream in Opencv, pushing it over RTMP (NGINX RTMP Module) using FFMPEG

  19 avril 2016, par Asymptote

  Output video :
  https://youtu.be/VxfoBQjoY6E

  Explanation :

  I want to : Process camera stream in Opencv and push it over to RTMP server. I already have NGINX (RTMP module) set up and I have tested streaming videos with both RTMP (Flash Player) and HLS.

  I am reading the frames in a loop and using ’subprocess’ in python to execute ffmpeg command. Here’s the command I am using :

  command = [ffmpeg,
  
      '-y',
  
      '-f', 'rawvideo',
  
      '-vcodec','rawvideo',
  
      '-pix_fmt', 'bgr24',
  
      '-s', dimension,
  
      '-i', '-',
  
      '-c:v', 'libx264',
  
      '-pix_fmt', 'yuv420p',
  
      '-preset', 'ultrafast',
  
      '-f', 'flv',
  
      'rtmp://10.10.10.80/live/mystream']
  
  
  
  
  
  import subprocess as sp
  
  ...
  
  proc = sp.Popen(command, stdin=sp.PIPE,shell=False)
  
  ...
  
  proc.stdin.write(frame.tostring()) #frame is read using opencv

  Problem :

  I can see the stream fine but it freezes and resumes frequently. Here’s the output of FFMPEG terminal log :

  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  frame=  117 fps= 16 q=22.0 size=     344kB time=00:00:04.04 bitrate= 697.8kbits/s speed=0.543x   

  It mentions speed at the end. I believe it should be close to 1x. I am not sure how to achieve that.

  And I am on the same network as server, I can post my python code if required. Need some ffmpeg guru to give me some advise.

  EDIT

  My input fps is actually 3.
  With '-use_wallclock_as_timestamps', '1' I can see in the log that speed is close to 1x.
  But HLS is not streaming live there’s 2 min delay, it halts and . Chris’s advise partially worked. I am not sure where exactly is the problem, I am starting to believe it has something to do with nginx-rtmp module.

  Here’s the final output, on left it’s flash and on right it’s hls. I am showing the ffmpeg options at the end.
  https://youtu.be/jsm6XNFOUE4