default installation problem.

Why Jay

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Apr 5, 2018, 2:05:36 PM4/5/18

to expyriment-users

Hello, I am new to expyriment.

I am using mac sierra and installed both python2/3.

I followed installation guide on the expyriment website through both default and alternative way.

When I import expyriment, I have an error message for both python versions relating to ffmpeg.

I have an internet access and error message told me I should report.

For python2:

Imageio: 'ffmpeg.osx' was not found on your computer; downloading it now.

Error while fetching file: <urlopen error [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661)>.

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/expyriment/__init__.py", line 115, in <module>

stimuli.Video.get_ffmpeg_binary() # in case it needs to be downloaded

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/expyriment/stimuli/_video.py", line 76, in get_ffmpeg_binary

imageio.plugins.ffmpeg.download()

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/imageio/plugins/ffmpeg.py", line 55, in download

get_remote_file('ffmpeg/' + FNAME_PER_PLATFORM[plat])

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/imageio/core/fetching.py", line 121, in get_remote_file

_fetch_file(url, filename)

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/imageio/core/fetching.py", line 177, in _fetch_file

os.path.basename(file_name))

IOError: Unable to download 'ffmpeg.osx'. Perhaps there is a no internet connection? If there is, please report this problem.

For python3:

Imageio: 'ffmpeg.osx' was not found on your computer; downloading it now.

Error while fetching file: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)>.

Traceback (most recent call last):

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 82, in get_exe

auto=False)

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/core/fetching.py", line 102, in get_remote_file

raise NeedDownloadError()

imageio.core.fetching.NeedDownloadError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/expyriment/stimuli/_video.py", line 70, in get_ffmpeg_binary

ffmpeg_binary = imageio.plugins.ffmpeg.get_exe()

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 86, in get_exe

raise NeedDownloadError('Need ffmpeg exe. '

imageio.core.fetching.NeedDownloadError: Need ffmpeg exe. You can download it by calling:

imageio.plugins.ffmpeg.download()

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/expyriment/__init__.py", line 115, in <module>

stimuli.Video.get_ffmpeg_binary() # in case it needs to be downloaded

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/expyriment/stimuli/_video.py", line 76, in get_ffmpeg_binary

imageio.plugins.ffmpeg.download()

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 55, in download

get_remote_file('ffmpeg/' + FNAME_PER_PLATFORM[plat])

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/core/fetching.py", line 121, in get_remote_file

_fetch_file(url, filename)

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/core/fetching.py", line 177, in _fetch_file

os.path.basename(file_name))

OSError: Unable to download 'ffmpeg.osx'. Perhaps there is a no internet connection? If there is, please report this problem.

I am looking forward to hearing from you.

Thank you for reading.

Sincerely,

YJ

Christophe Pallier

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Apr 5, 2018, 2:11:08 PM4/5/18

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Not a Mac user here, but have you tried installing ffmpeg independently?

E.g.

https://github.com/fluent-ffmpeg/node-fluent-ffmpeg/wiki/Installing-ffmpeg-on-Mac-OS-X

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WhyJ Cheong

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Apr 5, 2018, 2:43:32 PM4/5/18

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Thank you so much! The problem is solved!

Best

YJ

PhD student, GRA

Cognitive Ethnomusicology.

OSU School of Music

Why J Cheong

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Florian Krause

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Apr 5, 2018, 3:27:34 PM4/5/18

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The original problem is apparently related to a too old version of OpenSSL: https://stackoverflow.com/questions/44316292/ssl-sslerror-tlsv1-alert-protocol-version

www.fladd.de - Homepage of Florian Krause

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