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This reverts commit 2e833520.

* Test: add backend parameter

* VideoReader object now works on backend

* Frame reading now passes

* Keyframe seek now passes

* Pyav backend now supports metadata

* changes in test to reflect GPU decoder change

* Linter?

* Test GPU output

* Addressing Joao's comments

* lint

* lint

* Revert "Test GPU output"

This reverts commit f62e955d7dc81bcb23b40d58ea75413b9b62e76d.

* lint?

* lint

* lint

* Address issues in build?

* hopefully doc fix

* Arrgh

* arrgh

* fix typos

* fix input options

* remove read from memory option in pyav

* skip read from mem test for gpu and pyab be

* fix test

* remove unused import

* Hack to get reading from memory work with pyav

* patch audio test
Co-authored-by: Bruno Korbar <bkorbar@quansight.com>
Co-authored-by: Joao Gomes <jdsgomes@fb.com>

* Updated gpu decoder test to use parametrize

* Remove list comprehension

* Add seek in GPU decoder

* Merge the two tests

* Refine unit test

* Return RGB frames as output of GPU decoder

* Move clamp to the conversion function

* Cleaned up a bit

* Remove utility functions from test

* Use data member width directly

* Fix linter error

* [WIP] Add video GPU decoder

* Expose use_dev_frame to python class and handle it internally

* Fixed invalid argument CUDA error

* Fixed empty and missing frames

* Free remaining frames in the queue

* Added nv12 to yuv420 conversion support for host frames

* Added unit test and cleaned up code

* Use CUDA_HOME inside if

* Undo commented out code

* Add Readme

* Remove output_format and use_device_frame optional arguments from the VideoReader API

* Cleaned up init()

* Fix warnings

* Fix python linter errors

* Fix linter issues in setup.py

* clang-format

* Make reformat private

* Member function naming

* Add comments

* Variable renaming

* Code cleanup

* Make return type of decode() void

* Replace printing errors with throwing runtime_error

* Replaced runtime_error with TORCH_CHECK in demuxer.h

* Use CUDAGuard instead of cudaSetDevice

* Remove printf

* Use Tensor instead of uint8* and remove cuMemAlloc/cuMemFree

* Use TORCH_CHECK instead of runtime_error

* Use TORCHVISION_INCLUDE and TORCHVISION_LIBRARY to pass video codec location

* Include ffmpeg_include_dir

* Remove space

* Removed use of runtime_error

* Update Readme

* Check for bsf.h

* Change struct initialisation style

* Clean-up get_operating_point

* Make variable naming convention uniform

* Move checking for bsf.h around

* Fix linter error
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>