Steps to reproduce:
1. Create folder "ąćęłńóśżź" as a working folder.
2. Enter:
N_m3u8DL-RE.exe https://vcze131.cda.pl/1670449/1670449.mpd?uid=5983825771 --key 65353534306438366535346135346161:39303439626631336363393537303934 -M format=mkv
3. Output mp4 isn't decrypted.

With --use-shaka-packager file is decrypted correctly.

Problem with national characters
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : Problem with national characters
Issue date:

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Steps to reproduce:
1. Create folder "ąćęłńóśżź" as a working folder.
2. Enter:
N_m3u8DL-RE.exe https://vcze131.cda.pl/1670449/1670449.mpd?uid=5983825771 --key 65353534306438366535346135346161:39303439626631336363393537303934 -M format=mkv
3. Output mp4 isn't decrypted.

With --use-shaka-packager file is decrypted correctly.

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