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• ffmpeg won't livestream to youtube

  4 novembre 2019, par HeyItsDan

  I’m trying to write a simple "script" that allows me to stream a music radio to YouTube or any other platform but whenever I’m trying to test it, it won’t let me livestream at all, if anyone got a solution to this it would be very appreciated !

  StreamURL="xxxxxxxxxxxxxxxxxxxx"
  
  Key="xxxxxxxxxxxxxxxxxxxxxxxx"
  
  BackgroundPath="bg.jpg"
  
  NPPath="np.txt"
  
  
  
  ffmpeg \
  
  -re \
  
  -loop 1 \
  
  -framerate $FPS \
  
  -i $BackgroundPath \
  
  -s 1920x1080 \
  
  -ab 128k \
  
  -maxrate 2048k \
  
  -bufsize 2048k \
  
  -vf "drawbox=0:0:1920:100:black:fill, drawtext='fontfile=Arial\:style=Bold Italic:text=Now Playing':fontcolor=white:fontsize=35:x=20:y=20, drawtext=textfile='$NPPath':fontcolor=white:fontsize=28:x=20:y=58" \
  
  -c:a aac \
  
  -f flv $StreamURL$Key```

• GNU Radio + leandvb demodulation of DVB-S signals

  25 juillet 2016, par ShatteredPheonix

  I am new to signal processing and RF, however I am trying to receive Ham TV signals from the ISS in gnu radio and then demodulate them using leandvb so that I can playback the video through a standard player like VLC.

  So please excuse my incorrect terminology where used :

  I have the following GNU Radio Setup :
  

  A few things about the file I am using is that it was recorded at 1msps with a symbol rate of 1 which was done via USRP.

  After playing the flow graph this seem to be the result :
  

  The above image, to me looks like a fairly clean signal - in addition to this I can’t seem to clear it up anymore.

  However, when I put it through a DVB-S demodulater called leandvb it can’t seem to get any TS packets out.

  instead it reports :

  rawiq            : 1647M/549M   2048 writable  ,   2048 unread ( 0 
  
  2048 2048 )
  
  autonotched      : 2197M/549M   3072 writable !,   1024 unread ( 0 0 1024 0 )
  
  PSK symbols      : 955M/477M   4057 writable  ,   4870 unread ( 373 4870 )
  
  freq             :   0M/  0M      2 writable  ,      0 unread ( 0 )
  
  bytes            :   0M/  0M   9792 writable  ,      0 unread ( 0 )
  
  RS-enc packets   :   0M/  0M      4 writable  ,      0 unread ( 0 )
  
  rand TS packets  :   0M/  0M      4 writable  ,      0 unread ( 0 )
  
  TS packets       :   0M/  0M      4 writable  ,      0 unread ( 0 0 )
  
  SS               :   0M/  0M      1 writable  ,      1 unread ( 1 )
  
  packet counter   :   0M/  0M    400 writable  ,      0 unread ( 0 )
  
  Total buffer memory: 422 KiB

  it seems to have problems reading some symbols and raw data but I don’t know why and I have tried almost everything I can think of to get it work.

  and when I try to play the resulting ts file through mplayer / ffmpeg / ffplay / vlc I get various errors :

  • File does not contain Stream
  • Invalid data while preprocessing
  • Cannot prefill buffer

  Can anyone help me and tell me where I am going wrong ? As I am completely clueless and have been trying to solve this problem for about 2 weeks now ?

• I have to configure background music and voice with ffmpeg such that whenever voice will play background music volume will be less than voice ?

  18 janvier 2023, par Namrata Bandal

  creating dynamic volume changes in an audio file where the voice is playing, and the voice should be played at 100% volume throughout the duration of 4-16 seconds while the background music's volume changes between 4-8 seconds from 100% to 20% linearly, 8-12 seconds hold the volume at 20% and 12-16 seconds change the volume from 20% to 100% linearly after 16 seconds hold the volume at 100% and 4-16 seconds voice should be hold volume at 100% in ffmpeg command