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• How can I stream a video from localhost to web browser using the video tag ?

  3 septembre 2021, par kup

  Basically what I want to stream a video to my browser both on localhost, using Flask, OpenCV, or FFmpeg.

  


  But I am not sure how to do it.

  


  I tried this :

  


  #!/usr/bin/env python
from flask import Flask, render_template, Response
import cv2
import sys
import numpy

app = Flask(__name__)

def get_frame():
    c=cv2.VideoCapture("output.mkv")

    while True:
        retval, im = c.read()
        imgencode=cv2.imencode('.jpg',im)[1]
        stringData=imgencode.tostring()
        yield (b'--frame\r\n'
            b'Content-Type: text/plain\r\n\r\n'+stringData+b'\r\n')

    del(c)

@app.route('/vid')
def vid():
     return Response(get_frame(),mimetype='multipart/x-mixed-replace; boundary=frame')


if __name__ == '__main__':
    app.run(host='localhost',port=5000, debug=True, threaded=True)


  


  But it's not working. Maybe because it is sending images. How can I stream video ?

  


• Gstreamer, x264enc "Redistribute latency..." error

  20 août 2021, par Jason

  I'm trying to setup a video pipeline with very limited bandwidth. I was able to do it with two raspberry pis using the below lines. The first is for the camera pi and the second is to watch stream :

  


  gst-launch-1.0 rpicamsrc preview=false !  'video/x-h264, width=800, height=600, framerate=30/1' ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! udpsink host=YOUR_PC_IP port=5000
gst-launch-1.0 udpsrc port=5000 ! gdpdepay ! rtph264depay ! h264parse ! avdec_h264 ! autovideosink sync=false


  


  It works but I go over my bandwidth limit if there is movement. I'm not sure if there is a way to limit bandwidth by setting a parameter here :

  


  'video/x-h264, width=800, height=600, framerate=30/1'


  


  From what I can find online, I have to use something like x264enc. I've followed tutorials but I can't get x264enc to work. it always outputs "Redistribute latency..." on both machines when run and it stays there.

  


  I've tried using x264enc like follows :

  


  gst-launch-1.0 rpicamsrc preview=false !  'video/x-raw, width=800, height=600, framerate=30/1' ! x264enc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! udpsink host=YOUR_PC_IP port=5000
gst-launch-1.0 rpicamsrc preview=false !  'video/x-raw, width=800, height=600, framerate=30/1' ! x264enc tune=zerolatency ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! udpsink host=YOUR_PC_IP port=5000
gst-launch-1.0 rpicamsrc preview=false ! x264enc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! udpsink host=YOUR_PC_IP port=5000
gst-launch-1.0 rpicamsrc preview=false ! x264enc tune=zerolatency ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! udpsink host=YOUR_PC_IP port=5000


  


  Based on tutorials, I would think some of those should work. Other threads say that tune=zerolatency fixes my problem. At least the ones with same output of "Redistribute latency..." I don't know what I'm doing wrong.

  


  Any help would be appreciated. Thanks !

  


• Trying to stream webcam with VLC, video works but no audio

  19 août 2021, par MirceaKitsune

  I created a bash script a while back to stream my webcam to http with VLC. The line I used was :

  


  cvlc -vvv v4l2:///dev/video0 input_stream --sout '#transcode{vcodec=MJPG,vb=0,scale=1,acodec=none}:standard{access=http,mux=mpjpeg,dst=:1234}'


  


  That works fine but no audio. I've been trying to update it to capture sound from the webcam as well, but nothing I do seems to get that working. I know the ALSA address of the mic which is "hw:2,0" and using the arecord command as a test confirms it works, it's just vlc that isn't capturing or streaming accordingly. Here's the latest command I managed to work out, video is functional but no audio :

  


  cvlc -vvv v4l2:///dev/video0 alsa://hw:2,0 --live-caching=5000 --sout '#transcode{vcodec=h264,vb=1024,acodec=mpga,ab=128,samplerate=44100,channels=2}:standard{access=http,mux=ffmpeg{mux=flv},dst=:1234}'


  


  What is wrong with it and how do you recommend improving this ? Thanks.