There are some results here https://forum.dvdfab.cn/all?q=702%20
I did look in log and I see what I post below. Not sure, as I don’t use the site.
Might try changing to mkv and see, or try extracting to srt file?
2025:12:27-16:49:42 0×00005628 [Info]: [default] “[CefMedia] Error opening input: Invalid data found when processing input\r\nError opening input file H:/StreamFab/StreamFab/Temp/outputTemp/DRM MPD/2025_12_27_16_49_18_6164326632623337623935626337383764616262623464666564326434656237/Period_00/Sub_00/st_00.trans.srt.da.\r\nError opening input files: Invalid data found when processing input\r\n”
2025:12:27-16:49:42 0×00005628 [Info]: [default] “[CefMedia] StartRemuxMultiAudioSrtMetaUtil BROKEN_PIPE exit. ”