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• Capturing and streaming with ffmpeg while displaying locally

  21 avril 2024, par andrixnet

  I can capture with ffmpeg from a device, I can transcode the audio/video, I can stream it to ffserver.

  


  How can I capture and stream with ffmpeg while showing locally what is captured ?

  


  Up to now I've been using VLC to capture and stream to localhost, then ffmpeg to get that stream, transcode it again, and stream to ffserver.

  


  I would like to do this using ffmpeg only.

  


• Converting powerpoint .mov to .ts for streaming

  12 décembre 2017, par Cyril

  I have a .mov video (powerpoint exported to video) at 0.5 fps, and I want to stream this video :

  • stream server : vlc
  • stream client : omxplayer (video player for Raspberry Pi)

  Currently, I encode every video for streaming like this :

  ffmpeg -y -i video.mov -vcodec libx264 -preset veryfast -g 60 -acodec aac video.ts

  This works fine for any video, except for videos created by powerpoint. Those videos are at 0.5 fps, and it looks like vlc needs at least 10 fps for streaming. So I tried this in order to have 30 fps on the .ts file :

  ffmpeg -y -i video.mov -vcodec libx264 -preset veryfast -g 60 -acodec aac -r 30 video.ts

  But it doesn’t add frames :

  […]
  
  frame=    6 fps=0.0 q=-1.0 Lsize=     193kB time=00:00:06.00 bitrate= 264.0kbits/s speed=9.64x
  
  […]

  Creating a .mp4 file works fine, but can’t be streamed :

  ffmpeg -y -i video.mov -vcodec libx264 -preset veryfast -g 60 -acodec aac -r 30 video.mp4
  
  […]
  
  frame=  360 fps= 52 q=-1.0 Lsize=     314kB time=00:00:11.90 bitrate= 215.9kbits/s dup=354 drop=0 speed=1.71x
  
  […]

  I also tried converting this .mp4 video to a .ts for streaming, but the stream doesn’t work :

  ffmpeg -y -i video.mp4 -vcodec libx264 -preset veryfast -g 60 -acodec aac video.ts

  I found one way to have a working .ts file, but I don’t like it. It implies converting the file to raw yuv file, then converting it again to a h264 .ts file. I don’t like it because the raw yuv file is really big, and I need to specify the height and width of the final file :

  ffmpeg -y -i video.mov -vcodec rawvideo -acodec aac -pix_fmt yuv420p -r 30 video.yuv
  
  ffmpeg -y -f rawvideo -pix_fmt yuv420p -s:v 640x480 -r 30 -i video.yuv -vcodec libx264 -preset veryfast -g 60 -acodec copy video.ts

  So here is my question : is there a simple way to convert this .mov video to a streamable .ts video ?

• About real time video web streaming using ffserver(webm)

  29 avril 2016, par Potato

  I’m testing ffserver for real time streaming using web cam and mic.

  Use this ffserver conf

  HTTPPort 8090
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 1000000
  
  CustomLog -
  
  
  
  <feed>
  
  File /tmp/feed1.ffm
  
  FileMaxSize 1G
  
  ACL allow 127.0.0.1
  
  </feed>
  
  
  
  <stream>
  
  Feed feed1.ffm
  
  Format webm
  
  AudioBitRate 64
  
  AudioSampleRate 48000
  
  AudioChannels 1
  
  VideoCodec libvpx
  
  VideoSize 320x240
  
  VideoFrameRate 25
  
  AVOptionVideo flags +global_header
  
  AVOptionAudio flags +global_header
  
  PreRoll 15
  
  StartSendOnKey
  
  VideoBitRate 400
  
  </stream>

  and feed

  ffmpeg -f v4l2 -i /dev/video0 -f alsa - ac 1 - i hw:1 http://localhost:8090/feed1.ffm

  It’s okay when I approach with chrome http://IP_address:8090/live.webm

  But the problem is that the streaming shows little earlier moment, when I refresh the page. I think that’s not a delay problem.
  How can I use this for real time streaming.

  Regards.