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• Unknown input format : 'x11grab'

  5 juillet 2017, par jjh

  guys :

  I have problems when i compile ffmpeg and run ffmpeg in linux.

  My environment :

  1 : ubuntu 17.10_x64_bit(i don’t think the os version is the key)

  2 : gcc (Ubuntu 6.3.0-19ubuntu1) 6.3.0 20170618

  3 : ffmpeg open source code:3.2

  first, i download the source code from ffmpeg official site. I compile this project with there instructions：

  ./configure --prefix=/home/jjh/software/ffmpeg --enable-shared
  
  make
  
  make install

  and it worked without any error except some warning, then i run :

  ./ffmpeg -h

  i make sure that it works and output normally.

  but i want use ffmpeg to grabbing screen. so i use this construction(o) :

  ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg

  then output error :

  Unknown input format: 'x11grab'

  i want to re-compile this project with —enable-x11grab option, btw , so many solution tell me to to this. but when i add this option, i get some errors :

  Invalid option --enable-x11grab

  some people says that i should install some libs :

  libxfixes-dev
  
  sudo apt-get install libxext-dev

  so i installed these libs, but it always show this error. pls help me.

• FFMpeg, rtsp cameras and series of bad framses

  21 avril 2022, par Denis Gottardello

  I have a problem with ffmpeg and rtsp cameras.
As you can see in the screenshot below

  


  

  


  sometimes a serie of damaged frames come.
It is not a problem related to camera. The date and time is unreadable and the problem happens with different vendors of camera, with differen pcs and in different places.With the official software the live is perfect.
I'm trying with the lates ffmpeg source (5.0.1) in a Debian 11 machine.
I'm particolar intertested in this problem because I have written a software based on ffpmeg library and I have the same problem (using ffmpeg as library), in bouth Windows and Linux.

  


  This is the command line to record

  


  


  


  ./ffmpeg -i rtsp://192.168.1.11:554/onvif1  a.avi

  


  


  



  What can I do to resolve ?

  


• ONVIF Device Manager API and Decoder

  10 juillet 2023, par spiderelite

  I'm working on the source code of the onvif device manager software and I want to find the Api and decoder it uses.

  


  I first separated the odm.player part of the code into another solution and built it separately. the separated part contains these parts from the source code (in order of execution) :

  


  utils.linq
utils.diagnostics
utils.common
odm.player.lib
odm.player.media
live555
odm.player.net
utils.xml
utils.bootstrapping
odm.player.host


  


  Im tring to find the decoder and Api it uses(in the above parts) to decode the media. i need to find the specific part of the program to contain some information from a decoder.

  


  I know the source code is using ffmpeg and live555 libraries but I need to find their use and API in the odm.player part.

  


  I checked odm.player.host because it is the last project and depends on previous ones, but didn't find anything.

  


  what should i do next ? is there any official documentation of the API ? is there any important keyword related to ffmpeg that can I search it in the code ?