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File upload is really slow #25

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Moschn opened this issue Jul 2, 2016 · 2 comments
Open

File upload is really slow #25

Moschn opened this issue Jul 2, 2016 · 2 comments

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@Moschn
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Moschn commented Jul 2, 2016 •
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The file upload from werkzeug that is used in flask is really slow for binary files. On my machine one core is used at 100% for the entire upload duration and the speed is only around 150 kbit/s.

This is probably related to pallets/werkzeug#875
Moschn added a commit that referenced this issue Jul 19, 2016
@Moschn
Added warning for uploading uncompressed tif files (Issue #25)
d62c354
@Moschn
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Moschn commented Jul 19, 2016 •
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The problem is in the many newline characters in the uploaded files. If the tif file is compressed using the following commands, the upload is blazing fast.

convert video.tif -compress lzw compressed.tif

I dont know how to solve this.

Added a warning in d62c354

@Moschn
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Moschn commented Jul 19, 2016

Pillow can somehow not open lzw compressed tiff files, although this is specified in http://pillow.readthedocs.io/en/3.2.x/handbook/image-file-formats.html.

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@Moschn