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• How can I save an animation from matplotlib as a mp4 video file ? [duplicate]

  19 décembre 2018, par Manza

  This question already has an answer here :

  • How can I overcome this key word error ?
    
    4 answers
    

  I’m trying to render a animation.ArtistAnimation object into a 24 fps video file in format mp4.

  I have search about and I reached this. However, even after compiling ffmpeg I get this error message :

  C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\Scripts\python.exe 
  
  "C:/Users/trite/OneDrive/Documentos/MusiTex/Python/venv/Saving Animation.py"
  
  Traceback (most recent call last):
  
    File "C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\lib\site- 
  
  packages\matplotlib\animation.py", line 161, in __getitem__
  
      return self.avail[name]
  
  KeyError: 'ffmpeg'
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "C:/Users/trite/OneDrive/Documentos/MusiTex/Python/venv/Saving 
  
  Animation.py", line 20, in <module>
  
      FFMpegWriter = manimation.writers['ffmpeg']
  
    File "C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\lib\site- 
  
  packages\matplotlib\animation.py", line 164, in __getitem__
  
      'Requested MovieWriter ({}) not available'.format(name))
  
  RuntimeError: Requested MovieWriter (ffmpeg) not available
  
  
  
  Process finished with exit code 1
  
  </module>

  What is the problem with ?

  I would really appreciate if you can help me. Actually, if there is other ways to saving/render this kind of object into a video file (preferably mp4) I will be delighted to hear them.

  Thank you very much

• ERROR : jni not found building ffmpeg for Android

  13 décembre 2019, par Jim Rhodes

  I have successfully built ffmpeg libraries for Android and now I want to add MediaCodec support.

  I have added --enable-mediacodec --enable-jni to my configure command line and -I$SYSROOT/usr/include to extra-cflags.

  At the end of config.log is the following :

  check_headers jni.h
  
  test_cpp
  
  BEGIN /tmp/ffconf.m9iLX2Qm/test.c
  
      1   #include 
  
      2   int x;
  
  END /tmp/ffconf.m9iLX2Qm/test.c
  
  /home/jr/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang
  
   --sysroot=/home/jr/android-ndk/sysroot -D_ISOC99_SOURCE
  
   -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod
  
   -DPIC -target aarch64-none-linux-android
  
   -I/home/jr/android-ndk/sysroot/usr/include/aarch64-linux-android
  
   -I/home/jr/android-ndk/sysroot/usr/include -O3 -fPIC
  
   -D__ANDROID_API__=21 -std=c11 -fPIE -fomit-frame-pointer -fPIC -E
  
   -o /tmp/ffconf.m9iLX2Qm/test.o /tmp/ffconf.m9iLX2Qm/test.c
  
  ERROR: jni not found

  There is a jni.h in /home/jr/android-ndk/sysroot/usr/include.

  Is there anything else I need to add to my build script to get this to work ?

• FFmpeg installation on Raspberry Pi Zero W : Undefined references to __atomic

  3 février 2021, par MisterGray

  I'm trying to install ffmpeg on my Raspberry Pi Zero W, but I get several error messages.

  


  OS : Raspberry Pi OS (32-bit) Lite (May 2020)

  


  I have executed the following commands :

  


  sudo apt update
sudo apt full-upgrade
sudo apt install git
git clone https://github.com/FFmpeg/FFmpeg.git
cd FFmpeg
./configure --arch=armel --target-os=linux --enable-gpl --enable-omx --enable-omx-rpi --enable-nonfree
make -j2
sudo make install


  


  Output of last command :

  


  ...
LD      ffmpeg_g
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_init':
/home/pi/FFmpeg/libavformat/fifo.c:519: undefined reference to `__atomic_store_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_write_trailer':
/home/pi/FFmpeg/libavformat/fifo.c:624: undefined reference to `__atomic_fetch_add_8'
/usr/bin/ld: /home/pi/FFmpeg/libavformat/fifo.c:631: undefined reference to `__atomic_store_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_thread_write_packet':
/home/pi/FFmpeg/libavformat/fifo.c:188: undefined reference to `__atomic_fetch_sub_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_consumer_thread':
/home/pi/FFmpeg/libavformat/fifo.c:457: undefined reference to `__atomic_load_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_write_packet':
/home/pi/FFmpeg/libavformat/fifo.c:597: undefined reference to `__atomic_fetch_add_8'
collect2: error: ld returned 1 exit status
make: *** [Makefile:114: ffmpeg_g] Error 1


  


  Maybe another package is missing ? Do I have to change anything in the config ?