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• FFMPEG for Android - missing alsa format

  24 août 2012, par user1545779

  @rowntreerob has an android-ffmpeg implementation that build successfully using the default file settings.

  When you remove disble-avdevice and disbale-devices from the configure_ffmpeg script, ndk-build fails. The following is the error message :

  CP ffmpeg
  STRIP ffmpeg
   /android-ffmpeg/Project/jni
   /android-ffmpeg/Project/jni
   /android-ffmpeg/Project/jni
  jasongipsyblues@android-master : /android-ffmpeg/Project/jni$ ndk-build
  Compile thumb : ffmpeg <= ffmpeg.c
  Compile thumb : ffmpeg <= cmdutils.c
  Executable : ffmpeg
  /home/jasongipsyblues/android-ffmpeg/Project/obj/local/armeabi- >v7a/objs/ffmpeg/ffmpeg/ffmpeg.o : In function `main' :

  /home/jasongipsyblues/android-ffmpeg/Project/jni/ffmpeg/ffmpeg.c:6130 : undefined >reference to `avdevice_register_all'
  

  /home/jasongipsyblues/android-ffmpeg/Project/obj/local/armeabi- >v7a/objs/ffmpeg/ffmpeg/cmdutils.o : In function `print_all_libs_info' :

  /home/jasongipsyblues/android-ffmpeg/Project/jni/ffmpeg/cmdutils.c:639 : undefined >reference to `avdevice_configuration'

  /home/jasongipsyblues/android-ffmpeg/Project/jni/ffmpeg/cmdutils.c:639 : undefined >reference to `avdevice_version'
  
  collect2 : ld returned 1 exit status

  make : ** [/home/jasongipsyblues/android-ffmpeg/Project/obj/local/armeabi-v7a/ffmpeg] >Error 1

  Please pardon my poor formating skills, I still dont get the formating thing. It appears the deletion of the references is to avdevices is definitely affecting the use of ndk-build.

  All the alsa source files exist in the ffmpeg code. How does one build ffmpeg in such a way that alsa is included in the formats ?

• Extracting audio features

  27 avril 2023, par Srinjoy Chatterjee

  I am working on extracting features from an audio file to build a recommendation system.

  &#xA;

  So far I am able to extract tempo, beat-times, loudness and pitch class using librosa and ffmpeg.

  &#xA;

  My question how we can extract/detect features as Danceability, Energy, Acousticness, Speechiness, Valence without using Spotify API. Are there any libraries or algorithm using which we can do so.

  &#xA;

• Most efficient way to render bitmap to screen on Linux [on hold]

  22 juillet 2019, par Maximus

  My goal is to receive a video feed from wifi and display it on my screen. For this, I’ve created a couple of small programs and a bash script to automate them running. It works like this :

  UDPBitmap/Plotter & ffplay -i - < UDPBitmap/pipe & python requester.py;

  Translation : There is a C++ program called Plotter, its job is to receive packets on an assigned UDP port, process them and write it to pipe (named : UDPBitmap/pipe). The pipe is accessed by ffplay, and ffplay renders the video on screen. The python file is solely responsible for accessing and controlling the camera with various HTTP requests.

  The above command works fine, everything works as expected. However, the resulting latency and framerate is a bit lower than what I’ve wanted. The bottleneck of this program is not the pipe, it is fast enough. Wifi transmission is also fast enough. The only thing left is ffplay.

  Question :

  What is the most efficient way to render a bitmap to screen, on Linux ? Is there a de facto library for this that I can use ?

  Note :

  • Language/framework/library does not matter (C, C++, Java, Python, native linux tools and so on...)
  • I do not need a window handle, but is SDL+OpenGL the way to go ?
  • Writing directly to the framebuffer would be super cool...