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• Multiple running with executable built with pyinstaller

  2 avril 2020, par seokrae.kim

  I build my main.py to exe by pyinstaller like this.

  



  pyinstaller main.py --add-binary C:\sources\untitled\venv\Lib\site-packages\cv2\opencv_videoio_ffmpeg420_64.dll;.


  



  It is simple RTSP receiver program so it need opencv_ffmpeg binary to run.
Running command like this

  



  main.exe -address rtsp://127.0.0.1/profile1/media.smp


  



  It works I expected.
But when the process running in multiple, (I mean more than 2 same process running)
all process not responding and shutting down.

  



  I try clone whole result (dist folder content) to another folder
and run process another path but result is same. like this.

  



  D:\main1\main.exe -address rtsp://127.0.0.1/profile1/media.smp
D:\main2\main.exe -address rtsp://127.0.0.2/profile1/media.smp


  


• Simultaneously video overlaying in ffmpeg

  30 août 2013, par Kaan Yurdakök

  i'm trying to merge 2 videos. i have one main video and one transparent video . i want to overlay the transparent video over the main video. So far i've tried this code in ffmpeg

  ffmpeg -i D:\ffmpeg\Main.mov -i D:\ffmpeg\transparent.mov -filter_complex"blend=all_mode='overlay':all_opacity=0.1" output.mp4

  this code gives me a output.mp4 but only the main video, not merging. What's wrong with that code ?

• target_link_libraries in CMAKE using android studio 2.2.2

  22 novembre 2016, par fadi

  I am facing a weird issue and it’s difficult to know why because the compiler doesnt give any errors.

  I created a new project in android studio 2.2.2 with C++ support.
  I edited the .cpp file inside src/main/cpp and compiled the project to obtain (.so) file that i can use as a shared library. To this point everything works perfect.

  Here is where the problem occurs :

  I am trying to link prebuild shared libraries from ffmpeg. I have already build the libraries in .so format and all I need to do is link them to my .cpp file.

  To link the libraries, I opened the CMakeLists.txt inside android studio and told cmake to link those prebuild shared libraries using the following code :

  add_library(libavformat SHARED IMPORTED)

  set_target_properties(libavformat PROPERTIES IMPORTED_LOCATION  C:/Android  /SDK/MyProjects/ffmpeg_to_jpg/P3/app/src/main/jniLibs/libavformat-55.so)

  include_directories(src/main/cpp/include/)

  target_link_libraries(native-lib  libavformat)

  This code basically links libavformat to native-lib (which is created from my .cpp file)

  The linking process works fine, the reason is because the compiler doesn’t cry about any dependencies.

  However, my original shared library (native-lib) stops working, and by that I mean, I cannot call any functions from within it.

  If i remove the linking line

  target_link_libraries(native-lib  libavformat)

  The native-lib.so works fine and I can call any function from within that does not depend on libavformat.

  I am not sure what is going on, like I said the compiler doesnt issue any warnings or errors. it is almost like after the linking process the content of native-lib is overwritten by libavformat !!!!

  any ideas ?