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• How to properly format FFmpeg's -vf options for both text and snapshots ?

  20 août 2020, par user3224487

  I've got this working :

  


  ffmpeg -input_format yuyv422 -f v4l2 -s 800x448 -r 30 -i /dev/video0 -vf "[in]drawtext=fontfile=/usr/share/fonts/truetype/freefont/Roboto-Regular.ttf:text='%{localtime\:%d %b %Y}':x=8:y=8:fontcolor=white:box=1:boxcolor=black@0.75,drawtext=fontfile=/usr/share/fonts/truetype/freefont/Roboto-Regular.ttf:text='%{localtime\:%T}':x=8:y=24:fontcolor=white:box=1:boxcolor=black@0.75" -c:v h264_omx -r 30 -b:v 2M -an -f rtsp rtsp://localhost:8554/mystream


  


  It outputs a steady video-stream, with a double-lined text overlay, from my USB-connected webcam to rtsp-simple-server on my RPi 3A+.

  


  I've also got this working :

  


  ffmpeg -input_format yuyv422 -f v4l2 -s 800x448 -r 30 -i /dev/video0 -c:v h264_omx -r 30 -b:v 2M -vf fps=1/20 -update 1 /dev/shm/snapshot.jpg -an -f rtsp rtsp://localhost:8554/mystream


  


  But I can't figure out how to make FFmpeg do both at the same time - a video stream with double-lined text overlay, while saving a snapshot now and then to /dev/shm.

  


  What would the correct syntax for this look like ?

  


• ffmpeg windows av_interleaved_write_frame() : Operation not permitted failure

  26 janvier 2021, par Purgoufr

  I'm trying to share my computer's camera with the remote computer. Local machine is linux(ubuntu 20.04.1) and remote machine is windows 10. I created virtual camera in windows machine with use OBS virtual cam and I want to share camera from local to remote machine. I could start stream from local linux machine and I got stream via windows machine. But when I try to write the stream into the virtual camera(output device), I get the error av_interleaved_write_frame (): Operation not permitted.

  


  The command I wrote on the Windows side is as follows :

  


  ffmpeg.exe -f mpegts -i udp://192.168.5.5:5010 -c:v rawvideo -r 30 -pix_fmt yuyv422 -s 1280x720 -f sdl "OBS-Camera"


  


  The error message is as follows :


  


  Extra Info1 : In my experiments, if both the local and remote machines are Linux, it works successfully.

  


  Extra Info2 : I can view the stream that I received on windows side(remote) with the command ffplay.exe udp: //192.168.5.5: 5010.

  


  Do you have any suggestion ?

  


• ffserver + ffmpeg, out rtsp stream : why ffplay cannot play the stream, but movie player can

  18 juillet 2014, par user1914692

  Ubuntu 12.04
  I use ffserver + ffmpeg.

  There are a little revision of the original /etc/ffserver.conf :

  RTSPPort 5454
  
  RTSPBindAddress 0.0.0.0
  
  
  
  # ...
  
  
  
  <stream>
  
  Format rtp
  
  # coming from live feed 'feed1'
  
  Feed feed1.ffm
  
  </stream>

  The command of ffmpeg (Option 1) is :

  ffmpeg -re -i '/usr/share/red5/webapps/oflaDemo/streams/hobbit_vp6.flv'  http://localhost:8090/feed1.ffm

  BTW, if I use Option 2 as below, it does not work :

  ffmpeg -re -i '/usr/share/red5/webapps/oflaDemo/streams/hobbit_vp6.flv'  http://192.168.1.105:8090/feed1.ffm
  
  ## not work:
  
  [http @ 0x21a9c80] HTTP error 404 Not Found
  
  http://192.168.1.105:8090/feed1.ffm: Input/output error

  So now I need to display the stream.
  On the other computer :

  (Option 1) ffplay rtsp://192.168.1.105:5454/test2-rtsp.mpg

  Not work. [Output] rtsp UDP timeout, retrying with TCP.
  Why ?

  (Option 2) movie player : Open location : rtsp ://192.168.1.105:5454/test2-rtsp.mpg
  it works !