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• FFMPEG - live stream with dynamic content

  6 octobre 2019, par Arturek

  I’m trying to create a live stream with changing data in real-time on youtube.

  Let’s say I want to show the current Bitcoin price in real-time. For instance, using python and sending requests to some public APIs, I can very easily get current prices of Bitcoin. But I have no idea how to create such a live stream, which will be automatically updated with fresh data.

  I know that I can use ffmpeg to stream on youtube, but how would I change the content of my stream ? I know how to create an image every n seconds with the current price, but then I don’t know how to update my live stream with this image.

  # To make sure you know what I mean, I created a basic sample.
  
  
  
  import requests
  
  import json
  
  import time
  
  
  
  createYtLiveStream()
  
  
  
  while(True):
  
    response = requests.get('https://api.coindesk.com/v1/bpi/currentprice.json').json()
  
    price = response['bpi']['USD']['rate']
  
  
  
    # Create an image with Bitcoin price inside
  
    img = convertTextToPng(price)
  
  
  
    # Update my live stream with this new image (I don't know how to do it)
  
    updateYtLiveStream(img)
  
  
  
    time.sleep(20)

  I want to do it on Ubuntu. Can you tell me how can I do it, please ?
  Thanks.

• avfilter/showcqt : remove yuv offset

  3 novembre 2015, par Muhammad Faiz

  avfilter/showcqt : remove yuv offset
  this makes draw_bar faster
  
  slightly different result with old version
  check result (with 3 minutes audio file) :
  
  old :
  
      real    0m49.611s
  
      user    0m49.260s
  
      sys     0m0.073s
  
  new :
  
      real    0m47.606s
  
      user    0m47.378s
  
      sys     0m0.068s
  
  PSNR between old and new :
  
  yuv444p PSNR
  
      y:109.519298 u:107.506485 v:104.746878
  
      average:106.816074 min:99.167305 max:inf
  
  yuv422p PSNR
  
      y:109.519298 u:108.025801 v:104.489734
  
      average:107.279817 min:98.007467 max:inf
  
  yuv420p PSNR
  
      y:109.519298 u:108.363875 v:105.290200
  
      average:108.261511 min:97.461812 max:inf
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/avf_showcqt.c

• Burn picture in picture from two streams with ffmpeg

  9 juillet 2021, par Nagy Alfred

  I have a nice opportunity solving this with ffmpeg, but can not find solution :

  


  I need to burn picture in picture (pip from Desktop capture) to the top right corner of a recorded rtsp stream.

  


  I need to do it real time with the recording command (it can be really easy after the recording, but I do not have time to do it after the recording)

  


  The recording is done with this command :

  


  


  


  ffmpeg -i "rtsp://[username]:[pass]@xx.xx.xx.xx/cam/realmonitor?channel=1&subtype=0&unicast=true" -map 0:v -c:v copy -an -fflags flush_packets -max_delay 3 -flags -global_header -hls_time 20 -hls_list_size 1000 -vcodec copy -y "video.m3u8"

  


  


  



  The picture in picture is a Desktop capture with ffmpeg (real time capturing, not an existing video).

  


  Please help me solving this problem.

  


  Thanks !