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• How to show video (no audio) from ffmpeg via RTP in VLC ?

  15 juillet 2019, par Sagi Mann

  I’m trying to stream RTP (video only) from ffmpeg to VLC :

  ffmpeg -stream_loop -1 -i video.mp4 -vcodec copy -an -f rtp rtp://0.0.0.0:1235

  In VLC app, I do file -> "open network" and set the url to rtp ://@:1235.
  But I get an error :

  SDP required
  
  A description in SDP format is required to receive the RTP stream.
  
  Note that rtp:// URIs cannot work with dynamic RTP payload format (96).

  What am I doing wrong ? I see in ffmpeg’s output that SDP is being generated :

  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 0.0.0.0
  
  t=0 0
  
  a=tool:libavformat 58.20.100
  
  m=video 1235 RTP/AVP 96
  
  b=AS:1205
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1; sprop-parameter-sets=Z01AH9oBQBbsBEAAAAMAQAAADIPGDKg=,aO88gA==; profile-level-id=4D401F

• ffmpeg segment doesn't show file size update in real time

  9 juillet, par Lucas Cardoso

  I'm trying to run ffmpeg mp3 stream with segmentation for each hour. Everything is working perfectly, except for one thing : when i run the command, the file size doesn't grow in real-time as i need, it only grows in packages of 256k.

  



  Is there a way to turn a "real-time mode" ?

  



  I'm using ubuntu 18.04 with ffmpeg 3.4.6

  



  This is the code i'm trying to run on linux terminal :
  
ffmpeg -i http://radiocentova.conectastm.com:8363/stream -y -acodec libmp3lame -b:a 16k -ac 1 -ar 11025 -vn -strftime 1 -f segment -segment_time 3600 -flush_packets 1 @test_%Y%m%d%H%M%S+00.mp3

  



  
Recording with segment :

Recording without segment :


  


• How to get and show volume input level from rtsp using ffplay

  4 septembre 2019, par Xavier

  I´m trying to get and display the volume level from an ip camera with rtsp protocol. By now i achieved with ffmpeg but i need to do it with ffplay.

  I have tried many combinations with no luck. Some of these

  ffplay -f lavfi -i rtsp://admin:admin@10.0.0.99:554/live/ch0:showvolume=f=0:b=0:w=310:h=59:o=v:m=p

  Gives error "No such filter : ’rtsp ://admin:admin’"

  ffplay -f lavfi "amovie ='audio\=rtsp://admin:admin@10.0.0.99:554/live/ch0',showvolume=f=0:b=0:w=310:h=59:o=v:m=p"

  Gives error "Undefined constant or missing ’(’ in ’admin@10.0.0.99’ and so many others.

  ffplay -f lavfi "amovie ='audio\=Microphone (Realtek High Definition Audio)':f=dshow,showvolume=f=0:b=0:w=310:h=59:o=v:m=p"

  This code works with internal notebook microphone but i can`t see how to replace dshow with RTSP

  I already tried others combinations but nothing works.
  I need to know how specify an rtsp input with lavfi or any other way to show volume input level from a rtsp with ffplay.
  Thanks in advance