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• python imageio.get_reader() returns odd exception

  17 août 2020, par tristan_jia

  import imageio

reader = imageio.get_reader("./t.mp4")


  


  As shown above, with python 3.6.10, it returns :

  


  >>> reader = imageio.get_reader("../")&#xA;Traceback (most recent call last):&#xA;  File "<stdin>", line 1, in <module>&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/functions.py", line 129, in get_reader&#xA;    return format.get_reader(request)&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/format.py", line 168, in get_reader&#xA;    return self.Reader(self, request)&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/format.py", line 217, in __init__&#xA;    self._open(**self.request.kwargs.copy())&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 357, in _open&#xA;    self._initialize()&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 430, in _initialize&#xA;    shell=ISWIN)&#xA;  File "/usr/lib64/python3.6/subprocess.py", line 729, in __init__&#xA;    restore_signals, start_new_session)&#xA;  File "/usr/lib64/python3.6/subprocess.py", line 1364, in _execute_child&#xA;    raise child_exception_type(errno_num, err_msg, err_filename)&#xA;OSError: [Errno 8] Exec format error: &#x27;/home/tristan_jia/.imageio/ffmpeg/ffmpeg-linux64-v3.3.1&#x27;&#xA;&#xA;</module></stdin>

  


  I searched everywhere but haven't seen any similar questions. The script runs on Opensuse Leap 15.1, is it related to the system I use ?

  


• Invoking ffmpeg from Java correctly

  10 mars 2015, par Srinivas Suresh

  I would like to call on ffmpeg to split a video into frames, I used

  Process p=Runtime.getRuntime().exec("ffmpeg -i /home/video.mp4 -t 100 -filter:v \"fps=fps=60\" /home/%d.jpeg");
  
  p.waitFor();

  But I don’t get the desired result. Nothing happens to the video. How do invoke ffmpeg from java correctly

  EDIT

  Additionally when I invoke ffmpeg without any arguments that have quotes in them it works fine.

  Why is this getting voted down ??

• Compile FFmpeg with libfdk_aac

  26 mars 2024, par Toydor

  I been reading on how to convert mp3 to m4a, and found that I must compile FFmpeg if I'll use the AAC encoder, libfdk_aac.

  



  But reading FFmpeg guide on how to compile FFmpeg with libfdk_aac makes no sense for a beginner like me.

  



  To use libfdk_aac the encoding guide says :

  



  


  Requires ffmpeg to be configured with —enable-libfdk_aac
 —enable-nonfree.

  


  



  Where do I put those flags ?

  



  Do I put it here somewhere ? :

  



  cd ~/ffmpeg_sources
git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git
cd fdk-aac
autoreconf -fiv
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install
make distclean


  



  Or maybe here somewhere ?

  



  cd ~/ffmpeg_sources
git clone --depth 1 git://source.ffmpeg.org/ffmpeg
cd ffmpeg
PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig"
export PKG_CONFIG_PATH
./configure --prefix="$HOME/ffmpeg_build" \
  --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  --bindir="$HOME/bin" --extra-libs="-ldl" --enable-gpl --enable-libass --enable-libfdk-aac \
  --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx \
  --enable-libx264 --enable-nonfree --enable-x11grab
make
make install
make distclean
hash -r


  



  If I'm reading the compile guide right I guess that these two chunks of code is what I need to compile FFmpeg.

  



  I'm using Ubuntu server 12.4

  



  UPDATE

  



  After upgrading my system to Ubuntu 16.04 I had to install ffmpeg again. 
I still needed libfdk-aac. Fortunately there's a good step-by-step guide at http://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu on how to compile ffmpeg.

  



  I thought I would share how to compile if just interested in compiling ffmpeg with libfdk-aac and libmp3lame.

  



  If you haven't already a bin in home directory :

  



  mkdir ~/bin 


  



  Install dependencies. Didn't need the non-server packages :

  



  sudo apt-get update
sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libtheora-dev libtool libvorbis-dev pkg-config texinfo zlib1g-dev 


  



  Then install the encoders. Had to install yasm as well, otherwise I got errors when compiling.

  



  sudo apt-get install libfdk-aac-dev
sudo apt-get install libmp3lame-dev
sudo apt-get install yasm


  



  Then compile ffmpeg with needed flags

  



  cd ~/ffmpeg_sources
wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xjvf ffmpeg-snapshot.tar.bz2
cd ffmpeg
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
--prefix="$HOME/ffmpeg_build" \
--pkg-config-flags="--static" \
--extra-cflags="-I$HOME/ffmpeg_build/include" \
--extra-ldflags="-L$HOME/ffmpeg_build/lib" \
--bindir="$HOME/bin" \
--enable-libass \
--enable-libfdk-aac \
--enable-libfreetype \
--enable-libtheora \
--enable-libvorbis \
--enable-libmp3lame \
--enable-nonfree \
--enable-gpl
PATH="$HOME/bin:$PATH" make
make install
make distclean
hash -r