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• Compiling custom FFMPEG

  25 novembre 2019, par Arttu

  I need to compile ffmpeg from source for CentOS. The goal it to convert MP3 and WAV to FLAC. I tried to compile ffmpeg with this guide : https://trac.ffmpeg.org/wiki/CompilationGuide/Centos
  and it worked fine, but took approximately 20min and compiled a bunch unnecessary things, even thought I did not used next options as recommended in guide, but used :

  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  
  --prefix="/opt/tmg/ffmpeg_build" \
  
  --pkg-config-flags="--static" \
  
  --extra-cflags="-I/opt/tmg/ffmpeg_build/include" \
  
  --extra-ldflags="-L/opt/tmg/ffmpeg_build/lib" \
  
  --extra-libs=-lpthread \
  
  --extra-libs=-lm \
  
  --bindir="/opt/tmg/ffmpeg_build/bin" \
  
  --enable-gpl \
  
  --enable-libfreetype

  My question is what do I need for MP3 and WAV to FLAC and how do I compile just that part ?

  I found in configuration --disable-all option, but what do I have to enable ?

  Thanks in advance.

• C++ How to make a rtsp stream buffer in RAM and write it to file if needed

  18 septembre 2023, par FenyaHere

  The task is to receive data from rtsp and without decoding keep last 60 seconds of it in RAM to save when needed. Right now i'm doing it with OpenCV, decode frames and keep a buffer of frames, so when event triggers i just copy the buffer, encode it and save to file. But current uses too much memory and CPU to decode/encode and keep unencoded frames.

  


  I've tried to look into gstreamer library but failed to come up with a solution (i'm new to gstreamer). Should i look more into gstreamer (gstreamer-1.0, RTSP H264 stream and shared memory for example) ? Are there easier ways to do it(found this : https://trac.ffmpeg.org/wiki/Capture/Lightning) ? Thank you for your help !

  


• Python Wifi Issue Connect to Mysterious Camera

  27 avril 2015, par user2723463

  I have been working with some drones and robotics projects using arduino and python. There was a kickstarter project for a neat little hex copter, that hasn’t been managed well.

  I was lucky, i got my copter and then some time later after some frustrated email exchanges, i finally recieved the camera as well. To this day, their forum has people still complaining. Their maker forum is now down and their wiki hasn’t been updated with any specifics on the camera.

  http://www.flexbot.cc/wiki/index.php?title=Main_Page#Hardware

  Their app to accompany the drone still doesn’t support the camera module. Not that it’d matter, as their code isn’t very well documented or annotated.

  https://github.com/HexAirbot

  There are some tips on switching the camera on the comments page of their kickstarter campaign.

  https://www.kickstarter.com/projects/1387330585/hex-a-copter-that-anyone-can-fly/posts/1093716

  So, sob story over, i’m stuck with this neat little wifi camera that i am unsure on how to connect to. I know how to switch it on and it does have a micro-usb port on it.

  What library in Python could i use to stream an image from this camera given that it is a wifi camera. If i wanted the video stream as a numpy matrix.

  I need to interface with the camera, so i can connect and disconnect.

  Then, be able to read images frame by frame with ffmpeg. I have some python modules that can detect and read from a camera, but how can my code ensure that the camera is connected ?

  Totally stuck. Any help would be appreciated.