Netflix Forced Subtitles Problem

[maquinny]

I just downloaded 2 different shows, Black Mirror S03E02 and WWE Smackdown S27E23 - June 6, 2025 and grabbed the forced subtitles for both. The timestamps are all wrong. They start at the beginning of the episode. The text and lengths are correct but not the timestamps.

[Germania]

Which Subtitle Action and Subtitle Language ?
If "Remux into File" - also which Video Format?

I can't detect an error with Black Mirror.s03e02 English+German forced:

[maquinny]

Remux into file is what it's set to and format is H264


I tested the German forced subs and they work properly. The problem is the English forced subs
I tried a different show with forced subs and it worked no problem.
I played the Black Mirror episode in the Stream Fab app, just to make sure the subs were working properly and they are.

[Germania]

Remux into file is what it's set to and format is H264
I tested the German forced subs and they work properly.
The problem is the English forced subs

Please close SF, rename the StreamFab.log
start SF, try once and after download close SF
and attach your new StreamFab.log to your post

And I'll try it after work (in ~10 hours) with the same setting
VIP Video Format - mp4 or mkv(ffmpeg or mkvtoolnix) ?

[Germania]

Ok, I tried again Black Mirror.s03e02 with English+German forced
(in USA) with H264 (High) and remux into file (using SF 6242)

Video Format:
- mp4: german correct - english wrong (at the beginning)
- mkv(ffmpeg): german + english correct
- mkv(mkvtoolnix): german + english correct

I suspected two possible causes:

6.2.3.8
New: Some improvements on video remux engines FFmpeg and MKVToolNix.
or
6.2.3.3
Fix: A problem that some double-line subtitles only display one line when downloading videos from Netflix.

So I retried with mp4 and SF 6237 + 6232 - but both with same wrong result.

And of course with Sub Original Format or Extract to SRT all is fine.

So I don't really know how SF could fix the ffmpeg sub remux problem.

Try it yourself and you will see that is an ffmpeg (not SF) problem:

ffmpeg -i "Black Mirror.s03e02.mp4" -i "Black Mirror.s03e02.srt" -c:v copy -c:a copy -c:s mov_text "Black Mirror.s03e02_remux.mp4"

=> If you wanted mp4 with correct en forced subs remuxed: use mp4box like here