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GPU Decoder
===========
GPU decoder depends on ffmpeg for demuxing, uses NVDECODE APIs from the nvidia-video-codec sdk and uses cuda for processing on gpu. In order to use this, please follow the following steps:
* Download the latest `nvidia-video-codec-sdk <https://developer.nvidia.com/nvidia-video-codec-sdk/download>`_
* Extract the zipped file.
* Set TORCHVISION_INCLUDE environment variable to the location of the video codec headers(`nvcuvid.h` and `cuviddec.h`), which would be under `Interface` directory.
* Set TORCHVISION_LIBRARY environment variable to the location of the video codec library(`libnvcuvid.so`), which would be under `Lib/linux/stubs/x86_64` directory.
* Install the latest ffmpeg from `conda-forge` channel.
.. code:: bash
conda install -c conda-forge ffmpeg
* Set CUDA_HOME environment variable to the cuda root directory.
* Build torchvision from source:
.. code:: bash
python setup.py install
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