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• FFmpeg live streaming with a camera source but the camera source can be changed in realtime

  11 janvier 2018, par Faiz A. Farooqui

  I have a scenario where I would be using a camera source for the live streaming onto YouTube / Facebook.

  But I have more than one camera source, so basically I need to change the camera source in real time.

  Streaming with a single camera source is working fine for me, here below is the command I am using for the same.

  ffmpeg 
      -f avfoundation -framerate 30 -i "1:0"  # Camera Source with Mic
      -f avfoundation -framerate 30 -i "0"    # Screen Capture
      -loop 1 -i background.jpg               # Background Image
      -filter_complex "
          [2:v] format=argb,colorchannelmixer=aa=0.5 [base] ;
          [0:v] setpts=PTS-STARTPTS, scale=1440x900 [upperleft] ;
          [1:v] setpts=PTS-STARTPTS, scale=576x324 [lowerright] ;
          [base][upperleft] overlay=shortest=1:x=20:y=20 [interim] ;
          [interim][lowerright] overlay=shortest=1:x=1320:y=740
      " 
      -preset fast 
      -pix_fmt bgr0 
      -s 1920x1080 
      -threads 1 
      -f flv "rtmp ://a.rtmp.youtube.com/live2/stream-api-key"
  

  Here I am using a camera source and a screen capture source with a background image for live streaming, and I need to change the camera source in real-time.

• FFMPEG Audio Issues Youtube Live

  2 mars 2018, par Geige V

  This issue may have more to do with youtube than ffmpeg, but hopefully someone can help anyway.

  I am having the exact issue described in this post https://productforums.google.com/forum/# !topic/youtube/nHTb7ilKvrw. I would have added to it, but it is locked for some reason.

  I create a stream from a local webm file on my computer using ffmpeg. This file sounds perfectly fine, and still sounds fine when it is sent to platforms other than youtube live (twitch/facebook). On youtube live, however, the audio has static and crackles during the live feed, but the archive of the video on youtube (after processing) sounds perfectly fine. The ffmpeg command is

  ffmpeg -re -i test.webm -acodec aac -vcodec libx264 -ar 44100 -f flv rtmp://a.rtmp.youtube.com/live2/${your_key}

  Webm files from this fiddle (https://jsfiddle.net/2rgv7pgj/) will have the issue.

  If someone could offer advice it would be greatly appreciated.

• FFmpeg for automatic video generation from images ?

  22 janvier 2018, par Dionisis K

  I want to implement an automatic video generation from images, like facebook’s anniversary video. And I would also like to add some filters. I’ve been searching a lot and read FFmpeg’s documentation which is pretty amazing.

  In the future I want to have 10-20 "bashscripts" with different filters leading to different themes (e.g. fade-in, zoom, overlay images, left-to-right, etc..)

  So my biggest concern is having an interface which offers readable code and provides scalability. Since ffmpeg is a bashscript i searched for a wrapper

  There are wrappers in

  • https://github.com/PHP-FFMpeg/PHP-FFMpeg for php ,which doesn’t support image convertion to videos and complex filters .
  • https://github.com/fluent-ffmpeg/node-fluent-ffmpeg which looks promising but also difficult to go with complex filters
  • and https://github.com/kkroening/ffmpeg-python for python.I think that it s pretty good

  Are there any other wrappers worth to check ?
  Would you recommend something from the above ?
  Is there any pros and cons using a specific programming language for this particular case ?
  Is there anything else i should bear in mind before I make a decision ?