Some tests fail when this package is compiled against ffmpeg 4.0:

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ERROR: bob.io.video.test_codec.test_noise_format_mp4_codec_mpeg4
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Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 27, in check_format_codec
    orig, framerate, encoded = function(shape, framerate, format, codec, fname)
  File "bob.io.video/bob/io/video/utils.py", line 148, in frameskip_detection
    format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_ijdctrcp.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''

======================================================================
ERROR: bob.io.video.test_codec.test_noise_format_mp4_codec_mpeg4
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Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 27, in check_format_codec
    orig, framerate, encoded = function(shape, framerate, format, codec, fname)
  File "bob.io.video/bob/io/video/utils.py", line 111, in color_distortion
    format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_oijcem1u.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''

======================================================================
ERROR: bob.io.video.test_codec.test_noise_format_mp4_codec_mpeg4
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Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 27, in check_format_codec
    orig, framerate, encoded = function(shape, framerate, format, codec, fname)
  File "bob.io.video/bob/io/video/utils.py", line 183, in quality_degradation
    format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_fuxcg9dr.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''

======================================================================
ERROR: bob.io.video.test_codec.test_noise_format_mp4_codec_mpeg4
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 27, in check_format_codec
    orig, framerate, encoded = function(shape, framerate, format, codec, fname)
  File "bob.io.video/bob/io/video/utils.py", line 148, in frameskip_detection
    format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_v7wykwsk.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''

======================================================================
ERROR: bob.io.video.test_codec.test_noise_format_mp4_codec_mpeg4
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Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 27, in check_format_codec
    orig, framerate, encoded = function(shape, framerate, format, codec, fname)
  File "bob.io.video/bob/io/video/utils.py", line 111, in color_distortion
    format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_25keps__.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''

======================================================================
ERROR: bob.io.video.test_codec.test_noise_format_mp4_codec_mpeg4
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 27, in check_format_codec
    orig, framerate, encoded = function(shape, framerate, format, codec, fname)
  File "bob.io.video/bob/io/video/utils.py", line 183, in quality_degradation
    format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_st9p0d39.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''

======================================================================
ERROR: bob.io.video.test_codec.test_user_video_format_mp4_codec_mpeg4
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Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 119, in check_user_video
    codec=codec, format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_6xbll0aj.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''

======================================================================
ERROR: bob.io.video.test_codec.test_user_video_format_mp4_codec_mpeg4
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Traceback (most recent call last):
  File "/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "bob.io.video/bob/io/video/test_codec.py", line 119, in check_user_video
    codec=codec, format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_brdqwnim.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''
r_video_format_mp4_codec_mpeg4
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Traceback (most recent call last):
  File "/home/amir/miniconda/envs/video/lib/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/home/amir/idiap/git/bobs/bob.io.video/bob/io/video/test_codec.py", line 119, in check_user_video
    codec=codec, format=format, check=True)
RuntimeError: writer - constructor: C++ exception caught: 'bob::io::video::avformat_write_header(filename=`/tmp/bobtest_brdqwnim.mov') failed: cannot write header to output file for some reason - ffmpeg reports error -1163346256 == `Not yet implemented in FFmpeg, patches welcome''