Subtitle Tagging & MP4's

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what output do you get when you call:

"C:\Program Files\Hybrid\64bit\MP4Box.exe" -add "C:\Users\paul__000\AppData\Local\Temp\The Return of the King (1980) - 4K-subs_new_2021-08-11@15_35_51_6610_07.264"#video:fps=30000/1001:name="264@GPAC1.1.0-DEV-rev1089-gb4d25ac3b-ab-suite":lang="" -brand avc1 -add "C:\Users\paul__000\AppData\Local\Temp\iId_1_aid_0_lang_en_2021-08-11@15_35_51_6610_01.ac3"#audio:name="AC3 2.0 (Original Mono)":lang="en" -add "C:\Users\paul__000\AppData\Local\Temp\iId_2_aid_1_lang_en_2021-08-11@15_35_51_6610_02.ac3"#audio:name="AC3 2.0 (Normalized Mono)":lang="en" -add "C:\Users\paul__000\AppData\Local\Temp\iId_3_aid_2_lang_en_2021-08-11@15_35_51_6610_03.ac3"#audio:name="AC3 2.0 (Pseudo Stereo)":lang="en" -chap "C:\Users\PAUL__~1\AppData\Local\Temp\2021-08-11@15_35_51_6610__08.chp" -add "C:\Users\paul__000\AppData\Local\Temp\2021-08-11@15_35_51_6610_04_lang_en.ttxt":name="":lang="en" -add "C:\Users\paul__000\AppData\Local\Temp\2021-08-11@15_35_51_6610_05_lang_fr.ttxt":name="":lang="fr" -add "C:\Users\paul__000\AppData\Local\Temp\2021-08-11@15_35_51_6610_06_lang_es.ttxt":name="":lang="es" -cprt "1980 Rankin/Bass Productions, Inc." -itags name="The Return Of The King":comment="DVD Upscaled to 4K (Video Enhance AI V2.3.0)":genre="Fantasy (Animated)":cover="G:\4G Data HD Backup\Data backup\Paul's Backup\Downloads\Tolkein\Movies\Animated Movies\The Return of the King (1980)\VIDEO_TS\2168return-of-the-king_scan_hires.jpg":tool="Hybrid 2021.08.09.1" -tmp "C:\Users\paul__000\AppData\Local\Temp" -new "F:\Users\paul__000\Videos\Return of the King DVDRip\Upscale - Final - 1\2021-08-11@15_35_51_6610__09.mp4"

in a Windows Command Prompt?
The debug output shows that the crash happens during this call.
From the looks of it it crashs while writing the output file,...

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