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• rtl_fm piped to ffmpeg for udp stream

  4 novembre 2014, par user3936148

  rtl_fm piped to ffmpeg for udp stream

  Using Windows 7. I would like to pipe the rtl_fm standard out (pipe) to ffmpeg and udp stream it to an ip address. I have downloaded and installed rlt_sdr and other files and I have also installed sox. The console example given with the rtl_fm application using sox to play the radio station is below :

  rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 50 - | play -r 48000 -t s16 -L -c 1 -

  This works great, using sox.

  Update :

  Below works with ffplay sounds ok not great..

  rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 80- | ffplay -f s16le -ar 48000 -ac 1 -

  I would like to use ffmpeg instead, below is a non working example (just to give you an idea)

  rtl_fm -f 106500000 -M wbfm -s 200000 -r 48000 -l 0 -E deemp -g 50 - | ffmpeg -i - -f s16le -ar 48000 -ac 1 -acodec libmp3lame -ab 24k -ar 22050 -f mpegts udp ://192.168.1.196:1234 -

  useful links :

  http://kmkeen.com/rtl-demod-guide/

  http://sdr.osmocom.org/trac/wiki/rtl-sdr

  Thank you for your help

• FFMpeg kills itself when restreaming http to rtmp

  22 novembre 2019, par dust19992

  We are trying to restream few stations to our Emby server (alternative to plex), but always when we start the command as provided by many cast-software it runs for some time and then it dies.

  Here is our command :

  ffmpeg -i http://URL/IP:1515/station/discoverychannel/15HD -c:a aac -b:a 96k -ar 44100 -vcodec copy -f flv rtmp://server/discoverystation/15HD

  The error is none the only exit message is :

    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=33056 fps= 60 q=-1.0 Lsize=  302387kB time=00:09:11.45 bitrate=4492.0kbits/s speed=1.01x
  
  video:295223kB audio:6576kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.194924%
  
  [aac @ 0x55b6a748ee40] Qavg: 583.684
  
  Exiting normally, received signal 2 
  
  root@simpsons:~#```
  
  
  
  
  
  Our server is WOWZA media server, and we have been looking for the problem for some time now, but without any success, so we hope you guys can help us figure it out, we are trying to copy the live video as it is, and we do not want to change the encoding, or anything else, but if necessary then it has to be encoded.
  
  
  
  I have not much experience in ffmpeg but we have been using VMIX that uses ffmpeg and it's running smooth there to the server without dying, so there has to be a way to run that with the ffmpeg standalone. 
  
  
  
  Here is the WOWZA restream manual: https://www.wowza.com/docs/how-to-restream-using-ffmpeg-with-wowza-streaming-engine
  
  
  
  Thanks.

• Streaming vulkan framebuffer over HLS

  19 novembre 2022, par SOSparachuter1

  I need to stream frames from a native android Vulkan application of mine, I'm successfully copying data off my framebuffer and the raw frame data is ready for encoding. However I'm torn on what the best next steps would be.

  


  The raw image needs to be encoded to JPEG, then transported via HLS which will end up at some HTTP server which will host the playlist externally.

  


  The main point of contention is how I can encode the raw frame and then serve it to the HTTP server.

  


  I assume I'll need to start a tcp server to send raw frames to ffmpeg/gstreamer pipeline for encoding, but I'm not sure what that command would look like. Or whether there is a better way to do this.