[HELP] after encoding ass into mp4, but there is no subtitle at all

[ssdde]

i found the problem. i clear the entries in the Chapter-Queue, re-encode once, the FPS got normal. so it must be the chapter cause FPS drop half.

when encoding MP4 without chapters, the encoded MP4 file is OK now.


So here's the new problem, if i want to encode MP4 with chapters in future, how? since before encode MP4 with chapters the FPS will drop half.

Can i send you the original MKV with chapters for you to research? it's about 18GB, 20 chapters. you can have a try to see whether you get FPS drop.