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• WebRTC Multi-Stream recording

  11 janvier 2021, par Tim Specht

  I'm currently trying to build a WebRTC streaming architecture that contains multiple users streaming content from their camera in the same "room" and a SFU / MCU on server-side "recording" the incoming video packets, merging them into one image and re-distributing them to the viewers as either RTMP or HLS for added scalability.

  


  Upon doing some initial research on this, Janus Gateway seems like a good fit for this given it's wide adoption across the space + their (seemingly) extensible plugin architecture. Thus, I'm currently trying to figure out what a recommended architecture for my use-case would look like.
I looked at the following plugins :

  


  

  • Janus Streaming

  


  • Janus Recordings

  


  


  While Janus and the Streaming plugin seem like a good start to get the broadcasting aspect within the group of casters in the room, I'm trying to piece together how I could combine the different video sources into a combined one (split horizontally for example if there are 2 casters active) and retransmit the final result as something optimized for broadcast-consumption like HLS. Some of the ways I could imagine doing that :

  


  

  • Implement a custom Janus plugin that transcodes the incoming buffers on the gateway itself

  


  • Forwarding the incoming packets via RTP to a Transcoding server

    

    • In this specific case I am not sure what would be best to implement that ? Are the video frames different tracks ? Could I stream all of them to the same port and have ffmpeg or something similar take care of the merging for me ?

    


    


  


  


• YouTube-DL Python details of extracted audio file are not displayed

  16 septembre 2020, par Sushil

  I have written a small piece of code in python to extract the audio from a YouTube video. Here is the code :

  


  from __future__ import unicode_literals
import youtube_dl

link = input("Enter the video link:")

ydl_opts = {
    'format': 'bestaudio/best',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '192',
    }],
}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    info_dict = ydl.extract_info(link, download=False)
    video_title = info_dict.get('title', None)

path = f'D:\\{video_title}.mp3'

ydl_opts.update({'outtmpl':path})

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download([link])


  


  This is the folder where the output audio file is saved :


  


  As you can see, all the details of the audio file are displayed, such as Date Modified, Type and Size.

  


  However, if I change path = f'D:\\{video_title}.mp3' to path = f'D:\\YT_Files\\{video_title}.mp3', then the file details are not getting displayed.


  


  Any idea about why this is so ? Is there any way to solve this problem ? Any help would be appreciated. Thanks.

  


• avcodec : add decoder for Simon & Schuster Interactive's ADPCM variant

  6 février 2020, par Zane van Iperen

  avcodec : add decoder for Simon & Schuster Interactive's ADPCM variant
  Adds support for the ADPCM variant used by some Simon & Schuster
  
  Interactive games such as Real War, and Real War : Rogue States.
  Signed-off-by : Zane van Iperen <zane@zanevaniperen.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/adpcm.c
  • [DH] libavcodec/allcodecs.c
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/codec_desc.c
  • [DH] libavcodec/version.h