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* Add option to write audio to video file

Summary:
I was trying to use torchvision's `write_video` function and realized there was no option to add in the audio.

Thus, this diff contains the changes necessary such that this is possible. This is my first time trying to contribute to this project, so be as harsh as you need!

Reviewed By: fmassa

Differential Revision: D21480083

fbshipit-source-id: 2e11f2c8728d42f86c94068f75b843793d5a94aa

* Fix typo

* Try fix Windows

* Disable test on Windows
Co-authored-by: Joanna Bitton <jbitton@fb.com>

* Fix missing compilation files for video-reader

* Disable IO tests in travis

* torchscriptable functions for video io (#1653)

Summary:
Pull Request resolved: https://github.com/pytorch/vision/pull/1653



created new torchscriptable video io functions as part of the api: read_video_meta_data_from_memory and read_video_from_memory.

Updated the implementation of some of the internal functions to be torchscriptable.

Reviewed By: stephenyan1231

Differential Revision: D18720474

fbshipit-source-id: 4ee646b66afecd2dc338a71fd8f249f25a3263bc

* BugFix
Co-authored-by: Jon Guerin <54725679+jguerin-fb@users.noreply.github.com>

* Unify video metadata in VideoClips

* Bugfix

* Make tests a bit more robust

* Unify video backend interfaces

* Remove reference cycle

* Make functions private and enable tests on OSX

* Disable test if video_reader backend not available

* Lint

* Fix import after refactoring

* Fix lint

* test: Updated asserts in test_io

Updated all raw asserts to corresponding unittest.TestCase.assert. See #1483

* test: Fixed test_io

In order to use unittest.TestCase for asserts in temp_video, the object has to be passed itself to temp_video.

* test: Updated asserts to AssertionError

Switched initial raw assert to AssertionError.

* test: Changed AssertionError for ValueError

* Handle corrupted video headers in io

* Catch exceptions while decoding partly-corrupted files

* Add more tests

* extend video reader to support fast video probing

* fix c++ lint

* small fix

* allow to accept input video of type torch.Tensor

modified code of io.read_video and io.read_video_timestamps to intepret pts values in seconds (#1331)

* modified code of io.read_video and io.read_video_timestamps to interpret pts values in seconds

* changed default value for pts_unit to pts, corrected formatting

* hanndliing both fractions and floats for start_pts and end_pts, added test cases for pts_unit sec

* moved unit conversion logic to _read_from_stream method

* add _backend argument to __init__() of class VideoClips

* minor fix

* minor fix

* Make backend private in VideoClips

* Fix lint

* [WIP] Add CircleCI for CI

* Make jobs only run on master

* Add initial CI

* [wip] testing if works

* Trying some basic GPU tests

* [WIP] maybe it will work?

* [WIP] One more try

* Pin versions

* Simplify and reuse

* Fix

* [WIP] testing windows

* [WIP] testing windows

* Try windows

* Try Windows

* Try windows

* Try windows

* Try windows

* Try windows

* Try windows

* Try windows

* Windows speedup

* Windows multicores

* Add parallel flags for Windows

* Skip some tests on Windows

* Sync config.yml and config.yml.in

* Regenerate

* Run all tests

* Limit python and cuda version for finding pytorch

* Skip darwin for previous check

* Add description

* Fix logic

* Remove space

* Add CUDA test back

* Add back .travis.yml for now and remove duplicate test

* Add newline

Following a similar line of inquiry to pytorch/audio#217

* Optimize read_video_timestamps for some formats

* Add some tests

* Miscellaneous fixes and improvements

* Guard against videos without video stream

* Fix lint

* Add test for packed b-frames videos

* Fix missing import

Also extend video saving to support different codecs and options. Notably, we can now save with lossless compression

* Add VideoClips and Kinetics dataset

* Lint + add back missing line

* Adds ClipSampler following Bruno comment

* Change name following Bruno's suggestion

* Enable specifying a target framerate

* Fix test_io for new interface

* Add comment mentioning drop_last behavior

* Make compute_clips more robust

* Flake8

* Fix for Python2

* WIP

* WIP

* Add some documentation

* Improve tests and add GC collection

* [WIP] add timestamp getter

* Bugfixes

* Improvements and travis

* Add audio fine-grained alignment

* More doc

* Remove unecessary file

* Remove comment

* Lazy import av

* Remove hard-coded constants for the test

* Return info stats from read

* Fix for Python-2