fpdf.output() Linux vs Mac

[master0v]

On a mac machine fpdf.output() returns this:

bytearray(b'%PDF-1.3\n3 0 obj\n<</Type /Page\n/Parent 1 0 R\n/Resources 2 0 R\n/Contents 4 0 R>>\nendobj\n4 0 obj\n<</Filter /FlateDecode /Length 156>>\nstream\nx\x9c\x8d\x8f\xb9\nBA\x0cE\xe3\xae\xe3O\xdcR\x9b\x98\xc9L\xe6\xf1ZA\x0b;a>A\x14\xec\xb4\xf1\xf7\x8d\x8a\xb84\xda\x9c\x90\x85{\x88b\x13\x84\xad\xc1%,+\x16kE\x14\x96\x84\xba\xc7\xaa\x86\x13|W\xda\x0f\x9e\x0f\xf0\xcb\x9c\x12\x97\x8c\xc6\x94\xb3\xa2\xee0\xa3\x0eu\xa9G}\x1a8\x87\x04\x1a\xd1\xd8\'\x13\xef\x02a\x8ez\xf4Dl\x1f\x9a\xf8\xa7\xc6\x92qc\x1f\x1a\x90Pt\x99\x90:\xf5^\xf5+>#E...

while on a linux the same function returns this:

%PDF-1.3 3 0 obj <</Type /Page /Parent 1 0 R /Resources 2 0 R /Contents 4 0 R>> endobj 4 0 obj <</Filter /FlateDecode /Length 211>> stream x���½K�A�Ä·�êªÃ��D�¬"�½·o÷Ý%�"�-$��--EÁN�ÿ}_.¢I*�ÙeÞ0?FùØH´�_Í¢²{P&��Y_y_��ú­�ïèç�=�-ÅYæ��²¾p�ç Z�¢Ã!Np�6�Gî�Stþo×�.pî�)�q°É\²¾;�O�~ú'ß²ÅÁ¶ù�AB
ÑU]u|u¯¾0§¨²U_,¹Ê¼¬ë�üÔ��¦ì��{û]'¸Æ
�3Ü@Æu�;,±�×¹��n=³�AÇÌÕ�þ�xâ<�...`

the outputs are of course incomplete, but you get the difference. This causes incompatibilities in the code down the line.

[master0v]

looks like the mac version was/wasn't updated according to this https://pyfpdf.readthedocs.io/en/latest/reference/output/index.html

[Lucas-C]

pyfpdf is not maintained anymore, have you tried using fpdf2?
https://pyfpdf.github.io/fpdf2/

Note that both pyfpdf & fpdf2 use Pillow, that itself uses libjpeg-turbo on Windows and libjpeg elsewhere, leading to a slightly different image being parsed and included in the PDFs.