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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.

• How to convert a GIF to optimized mp4 video using FFMPEG on android ?

  6 novembre 2017, par Omar Hezi

  I successfully integrated FFMPEG as a library on android and I am using JNI to communicate my JAVA classes with C and C++ classes.

  Background and my question
  A chat app where GIFs can be sent, the issue is that one GIF could weigh up to 2MB, after a lot of research I found that the best solution is converting those gifs to mp4 (Something that Facebook messenger, whatsapp and telegram do).

  My question is, how can I convert a gif to mp4 in order to reduce its size, using ffmpeg (not in command line, in android) as Telegram mentions here ?

  What I have attempted

  • Understanding and implementing the gifvdeo.cpp from Telegram (it was extremely complicated and I could not understand it fully)
  • Converting the gif to frames of bitmaps, and compressing each bitmap and then converting those bitmaps to mp4 (I was not able to pass the bitmap object to C through JNI because of " Fatal signal 11 (SIGSEGV), code 1, fault addr 0x31f in tid 26952" which is another question)

  Research I have done

  • using ffmpeg to convert gif to mp4 , output doesn’t play on android
  • How to convert GIF to Mp4 is it possible ?
  • Convert GIF to Video in Android
  • https://unix.stackexchange.com/questions/40638/how-to-do-i-convert-an-animated-gif-to-an-mp4-or-mv4-on-the-command-line

  the problem with above questions is that they use command line FFMPEG which is not what I am doing, I am using JNI and direct access to c classes of mentioned library.