Sur d’autres sites (12912)

• Pipe OpenCV and PyAudio to ffmpeg streaming youtube rtmp from python

  22 août 2021, par a0910115172

  How can I pipe openCV and PyAudio to ffmpeg streaming youtube rtmp from python.
The error message shows as following :
No such filter : 'pipe:1'
pipe:1 : Invalid argument

  


  Here is my code :

  


  Import module

  


  import cv2
import subprocess
import pyaudio


  


  Audio

  


  p = pyaudio.PyAudio()
info = p.get_host_api_info_by_index(0)
numdevices = info.get('deviceCount')
for i in range(0, numdevices):
        if (p.get_device_info_by_host_api_device_index(0, i).get('maxInputChannels')) > 0:
            print("Input Device id ", i, " - ", p.get_device_info_by_host_api_device_index(0, i).get('name'))

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100

stream = p.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input=True,
                frames_per_buffer=CHUNK)

# Stream Audio data here
# data = stream.read(CHUNK)


  


  Video

  


  rtmp = r'rtmp://a.rtmp.youtube.com/live2/key'

cap = cv2.VideoCapture(0)
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
fps = 30



  


  command param here

  


  command = ['ffmpeg',
           '-y',
           '-f', 'rawvideo',
           '-pixel_format', 'bgr24',
           '-video_size', "{}x{}".format(width, height),
           '-framerate', str(fps),
           '-i', 'pipe:0',
           '-re',
           '-f', 'lavfi',
           '-i', 'pipe:1',
           '-c:v', 'libx264',
           '-c:a', 'aac',
           '-vf', 'format=yuv420p',
           '-f', 'flv',
           rtmp]


  


  Create subprocess to ffmpeg command

  


  pipe = subprocess.Popen(command, shell=False, stdin=subprocess.PIPE
)
while cap.isOpened():
    success, frame = cap.read()
    if success:
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
        pipe.stdin.write(frame.tostring())
        pipe.stdin.write(stream.read(CHUNK))


  


  Audio Stop

  


  stream.stop_stream()
stream.close()
p.terminate()


  


  Video Stop

  


  cap.release()
pipe.terminate()


  


  Thanks

  


• pipe compressed stream to another process using ffmpeg subprocess

  29 août 2021, par Naseer Ahmed

  I want to get compressed data from camera and send it to client side before converting it to frames. I have created a dummy code. but i am getting error that cannot reshape array of 0 byte

  


  import cv2
import subprocess as sp
import numpy

IMG_W = 640
IMG_H = 480

FFMPEG_BIN = "/usr/bin/ffmpeg"
ffmpeg_cmd = [ FFMPEG_BIN,
            '-i', 'h264.h264',
            '-vcodec', 'h264',              # disable audio processing
            '-f', 'image2pipe', '-']   

ffmpeg_cmd2 = [ FFMPEG_BIN,
            '-i','image2pipe',
            '-r', '30',                 # FPS
            '-pix_fmt', 'bgr24',        # opencv requires bgr24 pixel format.
            '-vcodec', 'rawvideo',
            '-an','-sn',                # disable audio processing
            '-f', 'image2pipe', '-'] 

 
pipe = sp.Popen(ffmpeg_cmd, stdout = sp.PIPE, bufsize=10)
 
pipe2 = sp.Popen(ffmpeg_cmd2, stdin = pipe.stdout,stdout = sp.PIPE, bufsize=10)

while True:
    raw_image = pipe2.stdout.read(IMG_W*IMG_H*3)
    image =  numpy.fromstring(raw_image, dtype='uint8')     # convert read bytes to np
    image = image.reshape((IMG_H,IMG_W,3))

    cv2.imshow('Video', image)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

pipe.stdout.flush()
cv2.destroyAllWindows()


  


• Split ffmpeg audio and video to different pipe outputs

  8 septembre 2021, par Bryan Horna

  I have a conference application using Jitsi Meet, and using their Jibri tool for streaming to an RTMP source.
  
But the delay is intolerable as of now so while looking out for alternatives I found that I can use WebRTC.
  
It turns out that most of the tools I've found (Pion, and others) expect me to send separate video/audio streams.
  
And Jibri uses an ffmpeg command which outputs both streams joined, so I want to split them.

  


  Here's the command in question :

  


  ffmpeg \
-y -v info \
-f x11grab \
-draw_mouse 0 \
-r 30 \
-s 1920x1080 \
-thread_queue_size 4096 \
-i :0.0+0,0 \
-f alsa \
-thread_queue_size 4096 \
-i plug:bsnoop \
-acodec aac -strict -2 -ar 44100 -b:a 128k \
-af aresample=async=1 \
-c:v libx264 -preset veryfast \
-maxrate 2976k -bufsize 5952k \
-pix_fmt yuv420p -r 30 \
-crf 25 \
-g 60 -tune zerolatency \
-f flv rtmps://redacted.info


  


  I'd want to have it output to at least two outputs (one for video and other for audio), using pipe:x or rtp://.
  
It'll be better if multiple output codecs are possible (audio opus/aac, video h264/vp8), so it supports most of WebRTC.

  


  I've read the documentation at ffmpeg website but still can't get to a command that does this job in just one command.
  
I know I could use -an and -vn with two different ffmpeg commands but that would consume more CPU I guess.

  


  Thanks in advance for your great help !