Recherche avancée

Sur d’autres sites (2630)

• download livestream real-time data

  15 juillet 2024, par Chenguang He

  I'm working on a project to design a RTMP server in Java to get livestream data and download to flv file. One requirement is that to capture the real-time data, I need to download the recording for every second instead of downloading entire recording when livestream stop. Is there any way to achieve it ? Thanks

  


  tried to download stream into byte array for every second and decode to flv using H.264 but didn't work.

  


• lavu/tx : add real to real and real to imaginary RDFT transforms

  3 août 2023, par Lynne

  lavu/tx : add real to real and real to imaginary RDFT transforms
  These are in-place transforms, required for DCT-I and DST-I.
  Templated as the mod2 variant requires minor modifications, and is
  
  required specifically for DCT-I/DST-I.
  

  • [DH] doc/APIchanges
  • [DH] libavutil/tx.c
  • [DH] libavutil/tx.h
  • [DH] libavutil/tx_template.c
  • [DH] libavutil/version.h

• Simultaneously map video and data streams to one subprocess pipeline in real-time

  9 février 2023, par seabass1217

  I need to process the video stream and the klvdata streams simultaneously in real-time in OpenCV/Python. I'm using FFMPEG to read the file or stream as OpenCV does not retain the klvdata. I pass the data to OpenCV with the subprocess module.

  


  My problem is I cannot figure out how to map both the video and klvdata to the same subprocess pipe simultaneously ?

  


  My code :

  


  #!/usr/bin/env python3
import sys, json, klvdata;
from subprocess import PIPE
import subprocess as sp
import cv2
import numpy

command = ['ffmpeg',
    '-i', 'DayFlight.mpg',
    '-map', '0:0',
    '-map', '0:d',        
    '-pix_fmt', 'bgr24',
    '-c:v', 'rawvideo',      
    '-an','-sn',              
    '-f', 'image2pipe', '-',
    '-c:d', 'copy',
    '-f','data',
    ]

pipe = sp.Popen(command, stdin=sp.PIPE, stdout=sp.PIPE, stderr=sp.PIPE, bufsize=10**8)

while True:
   raw_image = pipe.stdout.read(1280*720*3)
   image =  numpy.fromstring(raw_image, dtype='uint8')
   image = image.reshape((720,1280,3))          
   if image is not None:
      cv2.imshow('Video', image)
   if cv2.waitKey(1) & 0xFF == ord('q'):
      break
   for packet in klvdata.StreamParser(pipe.stdout): 
      metadata = packet.MetadataList()
      print(metadata)
pipe.stdout.flush()
cv2.destroyAllWindows()



  


  Produces the below error :

  


  Traceback (most recent call last):&#xA;  File "test_cv.py", line 32, in <module>&#xA;    metadata = packet.MetadataList()&#xA;AttributeError: &#x27;UnknownElement&#x27; object has no attribute &#x27;MetadataList&#x27;&#xA;&#xA;</module>

  


  Any help is greatly appreciated.