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• 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

  


• libavformat/http: add support for headers option in listen mode

  11 août 2016, par Moritz Barsnick

  libavformat/http: add support for headers option in listen mode
  Instead of silently ignoring the headers option in listen mode, use
  
  the provided headers.
  Signed-off-by : Moritz Barsnick <barsnick@gmx.net>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/http.c

• mpeg-2 ts video audio skipping - HTTP Live Streaming

  15 août 2012, par Kami Shangool

  I have multiple mp4 streams that I take and convert into mpeg-2 ts format using ffmpeg

  ffmpeg -i 0.mp4 -vcodec libx264 -sameq -acodec libfaac -fflags +genpts -coder 0 -f mpegts 0.ts

  The mp4s range from 1 to n. After converting all of them, I create a manifest file similar to :

  #EXTM3U
  
  #EXT-X-TARGETDURATION:4
  
  #EXT-X-VERSION:4
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-PLAYLIST-TYPE:EVENT
  
  #EXTINF:4.000,
  
  http://localhost/Nick2/0.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/1.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/2.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/3.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/4.ts
  
  #EXT-X-ENDLIST

  I've added the #EXT-X-DISCONTINUITY since the I'm trying to get back to back playback of the converted mp4's. The problem is that if I try to use HTTP live streaming, there is a noticeable pop in the audio between files. But that isn't apparent if playing the segments in QT.
  Any thoughts on how I can fix this ?