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• Server to Browser Audio Streaming

  20 mai 2020, par Dan P.

  My web app processes audio on the server-side with FFMPEG filter commands.

  



  Right now, the user uploads a file, then the whole file is processed, and then a .wav file is returned for download.

  



  I am looking to improve the app by adding real-time playback, so the user doesn't have to wait for the entire file to be ready to be able to listen to the changes.

  



  It would go like this :

  



  


  • The user uploads a file

  


  • The user selects a "start" time of the audio, say 0:00, and clicks play

  


  • The server would start processing the audio from that time and stream it back in real-time

  


  



  Any guidance appreciated, it's been quite hard to weed out the useless information from the useful so far. I believe that I would need to use the JS AudioContext API to play a buffer as it comes, along with WebSockets. Perhaps the fs module in Node.

  


• Desktop streaming to Wowza server using ffmpeg

  24 avril 2013, par Gergely Lukacsy

  Recently, I'm trying to utilize ffmpeg for streaming live desktop screen to a Wowza media server.

  I have partial success on the subject so far :

  I've managed to record desktop screen using the UScreenCapture directx dshow filter, and I'm also able to send this record to the server.
  However, when I'm trying to send the screen directly to the server, it fails every time. The player is buffering pretty slowly, and shows a blank screen when it's done (the counter keeps counting).

  So, here are the working methods

  for recording screen :

  ffmpeg -f dshow -i video="UScreenCapture" -r 25 -vcodec libx264 output.flv

  and for streaming video :

  ffmpeg -re -i  -map 0 -c copy -vbsf h264_mp4toannexb -f mpegts udp://stream.server.xyz:52000?pkt_size=1024

  And this is the code I'm using :

  ffmpeg -f dshow -i video="UScreenCapture" -s width x height -r framerate -vcodec libx264 -pix_fmt yuv420p -b:v bitrate -an -vbsf h264_mp4toannexb -f mpegts udp ://your.destination.url:PORTNUMBER ?pkt_size=some_bytes

  As far as I can remember, it worked well before I upgraded wowza.

  Some additional info :

  • OS : win7 sp1 64bit
  • ffmpeg N-49610-gc2dd5a1 (Zeranoe FFmpeg build 2013 Feb 5)
  • UScreenCapture : x64 Edition Version 2.0.14
  • Wowza 3.5.2 running on a Debian linux 2.6.32-5-amd64
  • Flowplayer : 3.2.15

  Looking trough the Wowza log files, something caught my attention. It seems when I'm streaming desktop screen, the server somhow gets uncomplete packets, but when I'm streaming a video file, the error doesn't occurs.

  RTPDePacketizerMPEGTS.handleRTPPacket
  
  WARN server comment 2013-04-11 11:26:24 - - - - - 152629.665 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:27 - - - - - 152632.782 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:31 - - - - - 152636.383 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:38 - - - - - 152643.484 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:47 - - - - - 152653.088 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:52 - - - - - 152657.587 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:26:56 - - - - - 152661.624 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
  
  WARN server comment 2013-04-11 11:27:05 - - - - - 152670.805 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472

  What causes this error ? Any ideas ?

  Thanks in advance !

• Windows server crashs in video transcode during

  6 février 2019, par parsa

  I’m using ffmpeg for transcoding of my videos on a HP Blade dedicated server with these details :

  OS : Windows Server 2012 R2 64Bit
  CPU : Intel XEON X5650
  RAM : 16GB
  Hard disk : A sas normal disk

  This command is a sample for creating qualities which has 4K as top level and
  I use this command for creating lower qualities from that as parallel at the same time.

  ffmpeg -i input.mp4 -filter_complex 
  
  [0:v]split=4[s0][s1][s2][s3];
  
  [s0]scale=uhd2160[v0];
  
  [s1]scale=hd1080[v1];
  
  [s2]scale=hd720[v2];
  
  [s3]scale=hd480[v3];
  
  [s4]scale=nhd[v4];
  
  [s5]scale=cga[v5]
  
  -map [v0] -map [v1] -map [v2] -map [v3] -map [v4] -map [v5] -map 0:a 
  
  -c:v libx264 -c:a aac -f tee -g 48 -threads 0 
  
  "[select='v\:0,a':f=hls:hls_list_size=0:hls_time=6]../video/2160p/out.m3u8| 
  
   [select='v\:1,a':f=hls:hls_list_size=0:hls_time=6]../video/1080p/out.m3u8| 
  
   [select='v\:2,a':f=hls:hls_list_size=0:hls_time=6]../video/720p/out.m3u8| 
  
   [select='v\:3,a':f=hls:hls_list_size=0]../video/480p/out.m3u8| 
  
   [select='v\:3,a':f=hls:hls_list_size=0:hls_time=6]video/360p/out.m3u8| 
  
   [select='v\:3,a':f=hls:hls_list_size=0:hls_time=6]video/200p/out.m3u8"

  Some times in transcoding time windows goes to reconnecting and count up to 20 and then goes to black screen.
  I cannot find anythings in windows logs.
  And finally I restart server from button of that server.
  What’s hapenning ?
  How can I find a clue, about this issue ?
  Any one know anything about this issue ?