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• Including library header file

  4 juin 2015, par Erik Villegas

  I’ve installed OpenSSL, and put the header files in /usr/include.

  So when I compile this very simple program, it works just fine with gcc and clang :

  #include <openssl></openssl>ssl.h>
  
  void main() {}

  Now I’m trying to compile FFmpeg with OpenSSL. I’ve include the appropriate flags, but ./configure gets hung up here :

  /Users/..../ffmpeg-2.2.1/libavformat/network.c:40:10: fatal error: 'openssl/ssl.h' file not found
  
  #include <openssl></openssl>ssl.h>
  
           ^
  
  1 error generated.
  
  make: *** [libavformat/network.o] Error 1

  Any idea why it wouldn’t recognize the location of openssl ? I’m stumped.

• Efficient low latency stream forwarding in intel atom

  31 juillet 2017, par Sönke Felsing

  I have a certain problem in forwarding a stream from a web camera to my local network.

  My Network camera provides a RTP video stream 720p24 to NIC1 of my Gateway PC (Intel Atom, 1.8GHz , Ubuntu 16.04). Now I would like to forward this stream to all PCs (Intel i5, i7,...) which are connected to NIC2 of the Gateway PC.

  I tested already some stuff with ffmpeg and VLC. VLC does not even run the Video on the Atom due to Hardware limitatons and ffmpeg is just capable of 1-2fps at 480p, but ffserver works fine. MPlayer at least Shows the Video in all its beauty but does not support Streaming unfortunately.

  Does anybody know a well performing way to get access to the stream of the camera through the Gateway PC without directly connecting the two Networks ? Due to the fact that we would like to make some remote operations there may not be introduced any further latency for buffering, transcoding, ...

  If the Solutions uses multicast I would be happy.

  I really look forward to your responses !

• How do I add a delay between a camera and a livestream using ffmpeg, since the -vf tpad=start_duration does actually delay the stream coming out ?

  12 août 2020, par Kenneth Ocheltree

  In trying to add a 10 second delay between a number of cameras and livestreams being fed into OBS, I wanted to be able to switch the stream before certain events occurred and the 10 second delay would allow that.

  


  I found that using a command of the form :

  


  ffmpeg -i input -vf tpad=start_duration=10 -af adelay=10000|10000 stream-out


  


  would insert 10 seconds of blank content at the beginning of the video stream, but that it would stream out all of the blank content in the first several seconds so that the outgoing livestream was effectively caught up with the incoming camera stream.

  


  Looking at the outgoing network traffic, I would see a burst of high network traffic when the stream starts sending the first 10 seconds of data and then the network traffic settles to the usual constant traffic level for the video stream.

  


  If I start watching the outgoing stream at the beginning, there is a 10 second delay in the stream. If I ever lose the stream and reconnect or start watching the stream after it was already running, the 10 second delay is no longer there.

  


  I am really trying to cause ffmpeg to delay the sending of the output stream in time, so that it is always buffering 10 seconds of data, and the -vf tpad=start_duration=10 -af adelay=10000|10000 commands do not do that.

  


  Is there another ffmpeg command that will force the actual output traffic of ffmpeg to stay delayed ?