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• ffmpeg and Youtube upload - can't merge existing audio track with external one

  9 avril 2012, par Aleksy Goroszko

  I am realizing campaign, where idea is that users are creating TV ad. The process looks as following :

  • User watches ad (youtube video)
  • User selects video (mp4 file played in Flash Player)
  • User records his own voice using webcam/mic for the selected video
  • User's voice is uploaded to server
  • User's voice is merged with selected video (video+music) and saved as mp4 file
  • User's video is uploaded to youtube

  When realizing audio-video merging I found some suprises :

  When I was using command

  ffmpeg -i sourceVideoFile.mp4 -i sourceAudioFile.mp3 -acodec copy -vcodec copy outputFile.mp4 - video's music was replaced by user's voice.

  So I used option -newaudio :

  ffmpeg -i sourceVideoFile.mp4 -i sourceAudioFile.mp3 -acodec copy -vcodec copy outputFile.mp4 -newaudio - I can hear that output video has both music and user's voice. So - that's what I wanted to reach. But...

  The surprize is that if I upload this video to Youtube, after it's processing I can watch it and hear only music. User's voice disappears !

  So, how to keep both voice and music ?

  Any idea, gurus ? :)

• Stream to youtube from xvfb using ffmpeg and x11grab

  13 décembre 2017, par Ivan Sergeev

  I want to make stream from virtual display to youtube via ffmpeg.
  I’m using this code :

  #! /bin/bash
  
  
  
  BITRATE="2500k"                                    
  
  FPS="30"                                       
  
  
  
  YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"  
  
  YOUTUBE_KEY="..."                                     
  
  
  
  SOURCE="./test.mp4"
  
  
  
  export DISPLAY=44
  
  sudo xvfb-run -a -n 44 -l -s "-screen 0, 1280x720x24" google-chrome -start-maximized https://upload.wikimedia.org/wikipedia/commons/2/2c/Rotating_earth_%28large%29.gif --no-sandbox >/dev/null &
  
  
  
  ffmpeg -threads 0 -y -v verbose -re \
  
   -f x11grab -video_size 1280x720 -i :44 \
  
   -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -r $FPS -g $(($FPS * 2)) -b:v $BITRATE -bufsize 512k \
  
   -acodec libmp3lame -ar 44100 -threads 0 -crf 25 -b:a 712000 -bufsize 512k \
  
   -f flv "$YOUTUBE_URL/$YOUTUBE_KEY"

  And I don’t receive any errors, but youtube cannot start stream(

  In my log :

  Stream mapping:
  
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=    4 fps=0.0 q=17.0 size=      72kB time=00:00:00.50 bitrate=1186.9kbits/s
  
  frame=    6 fps=5.9 q=17.0 size=     106kB time=00:00:00.93 bitrate= 931.2kbits
  
  frame=    8 fps=5.3 q=17.0 size=     141kB time=00:00:01.36 bitrate= 846.4kbits/s
  
  frame=   11 fps=5.4 q=16.0 size=     188kB time=00:00:02.00 bitrate= 771.9kbits/s
  
  frame=   13 fps=5.2 q=15.0 size=     217kB time=00:00:02.43 bitrate= 730.5kbits/s
  
  frame=   15 fps=5.0 q=14.0 size=     241kB time=00:00:02.86 bitrate= 687.2kbits/s
  
  frame=   18 fps=5.1 q=14.0 size=     270kB time=00:00:03.53 bitrate= 625.2kbits/s
  
  frame=   20 fps=4.9 q=15.0 size=     294kB time=00:00:03.96 bitrate= 608.3kbits/s

  etc.

  However, if I do stream from file, but not x11grab stream is starting normal.

  What I’m doing wrong ?
  Any ideas, guys, please)

• How to broadcast a livestream from YouTube to Telegram using vlc from the command-line ?

  22 février 2024, par shackra

  I want to re-transmit a live stream from YouTube (with streamlink) and broadcast it on a Telegram channel using VLC on the command-line. I think VLC is my best option for getting data from the source and sending it to the new destination.

  


  The thing is, I don't know how to configure the output correctly for the Telegram channel, nor how to put the transmission key.

  


  I was reading this answer https://stackoverflow.com/a/40461349/2020214 and using it as a guide unsuccessfully (Telegram does not detect any livestream)