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• python imageio.get_reader() returns format error

  19 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 ?

  


• Compile FFmpeg with libfdk_aac

  18 février 2017, 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

• avcodec/adpcm : Fix undefined left shifts of negative numbers

  20 janvier 2020, par Andreas Rheinhardt

  avcodec/adpcm : Fix undefined left shifts of negative numbers
  Affected the adpcm-afc, adpcm-ea-1, adpcm-ea-2, adpcm-ea-maxis-xa,
  
  adpcm-thp and ea-cdata FATE-tests. Also fixes ticket #8487.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/adpcm.c