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Pims.open Throws "UnkownFormat Error" with "Invalid Argument" On One Machine But Not on Another
12 août 2021, par KaceBellamyI'm trying to do some video processing for a physics experiment, and I want to do it on my much more powerful Windows desktop computer as opposed to my Mac laptop.


The following code works like a dream when run as a Jupyter notebook on my Mac :


import matplotlib as mpl
from mpl_toolkits import mplot3d
import pims
import trackpy as tp 

@pims.pipeline
def gray(image):
 return image[:, :, 1] # Take just the green channel

frames = gray(pims.open('output.mp4'))


but on my Windows machine I get this error :


---------------------------------------------------------------------------
UnknownFormatError Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_12152/704954007.py in <module>
 1 #Actually converts the video. Might be VERY processor intensive... or not?
----> 2 frames = gray(pims.open('output.mp4')) #Make the File Name whatever file you like!

~\miniconda3\lib\site-packages\pims\api.py in open(sequence, **kwargs)
 207 warn(message)
 208 exceptions += message + '\n'
--> 209 raise UnknownFormatError("All handlers returned exceptions:\n" + exceptions)
 210 
 211 

UnknownFormatError: All handlers returned exceptions:
<class> errored: [Errno 22] Invalid argument: 'output.mp4'
<class> errored: [Errno 22] Invalid argument: 'output.mp4'
<class> errored: Could not load meta information
=== stderr ===

ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.2.1 (GCC) 20200122
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
C:\Users\Callum\OneDrive - The University of Chicago\output.mp4: Invalid argument
<class> errored: MoviePy error: failed to read the duration of file output.mp4.
Here are the file infos returned by ffmpeg:

ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.2.1 (GCC) 20200122
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
output.mp4: Invalid argument
</class></class></class></class></module>

output.mp4 is just a run of the mill video file taken on a CCD camera ; I've tried converting it to a .MOV, I've tried other video files taken on different cameras, and I've tried running the file through FFmpeg to impose a 30 fps framerate ; everything I've tried works fine on my Mac and throws the above error on my Windows machine.


For reference, I installed necessary packages for this code on both machines this morning, so it should all be up to date and the same on both.


Any ideas as to what's up ? Thanks !


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