11.07.2021, 19:09
I found a way to reproduce the issue.
Will try look at it during the week, but not sure if I find the time.
Cu Selur
Will try look at it during the week, but not sure if I find the time.
Cu Selur
[HELP] after encoding ass into mp4, but there is no subtitle at all
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11.07.2021, 19:09
I found a way to reproduce the issue.
Will try look at it during the week, but not sure if I find the time. Cu Selur
11.07.2021, 19:14
yeah, I'm not wrong, there must be something wrong.
11.07.2021, 19:21
Question is what.
Unlike what you wrote remuxing the file without chapters does not fix the problem here. -> Does it make a difference for you if you disable 'x264->Main->Automatically->Create qp file chapters' ?
11.07.2021, 19:28
Okay, remuxing to mkv does resolve the problem.
So the video stream itself is okay, the chapter times are okay. And it's likely a bug in MP4Box, will have to do more testing to be sure. Cu Selur
11.07.2021, 19:44
-> Does it make a difference for you if you disable 'x264->Main->Automatically->Create qp file chapters' ?
under x264 - base, there is no Automatically. And i found x264 - Misc - Main - Automatically, there is a "Create qp file chapters", it's checked by default. remuxing to mkv does resolve the problem? no, it's impossible, after remuxing, it's still the same.
11.07.2021, 19:47
Sorry, meant:
'x264->Misc->Main->Automatically->Create qp file chapters' Opening the laggy file in Hybrid, setting audio&video to passthrough all and saving the file as a .mkv file does fix the issue here. Cu Selur
11.07.2021, 20:38
good news! after uncheck "Create qp file chapters", then encode, everything is OK now. So what's "Create qp file chapters" is use for?
okay, no clue why that helps.
![]() Try also keeping 'Create qp file chapters' enabled while making sure that 'x264->Frames->Advanced Frame Settings->Open GOP' is disabled. Quote: So what's "Create qp file chapters" is use for?It makes sure that at each chapter point an I frame is created to make sure that jumping to the chapter point properly works. Cu Selur Ps.: Using ffmpeg instead of MP4Box for muxing also works.
11.07.2021, 20:46
this option can't check, it's always unenabled state no matter 'Create qp file chapters' checked or not.
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11.07.2021, 20:49
Ah okay, it's a side effect of the 'ultrafast' preset, to be precise it can't be used when b-frames aren't used.
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