Mp4SubtitleParser

Program to extract embed wvtt/ttml subtitle in mp4.

Translated from shaka-player project.

python/js prj: https://github.com/xhlove/dash-subtitle-extractor

how to split single-file

"C:\Bento4-SDK-1-6-0-639.x86_64-microsoft-win32\bin\mp4split.exe" single-file.mp4

usage

Mp4SubtitleParser <segments dir> <segments search pattern> [output name] [--segTimeMs=SEGMENT_DUR_IN_MS]

wvtt example

│ Mp4SubtitleParser.exe
└─samples-vtt
        init.mp4
        segment-1.0001.mp4
        segment-1.0002.mp4
        segment-1.0003.mp4
        segment-1.0004.mp4
        ...

Mp4SubtitleParser.exe samples-vtt *.mp4

you got output.vtt

TTML example

│ Mp4SubtitleParser.exe
└─samples-ttml
        init.mp4
        segment-1.0001.mp4
        segment-1.0002.mp4
        segment-1.0003.mp4
        segment-1.0004.mp4
        ...

Mp4SubtitleParser.exe samples-ttmls *.mp4

you got output.ttml and output.srt

time offset for TTML

in that case, every segment's basetime is 00:00:00.000...

sample

(put any ttml init.mp4 to the folder, so program can recognize ttml header)

Mp4SubtitleParser.exe "samples-ttml(no init, need offset)" *.mp4 --segTimeMs=60000

segment-01 will add offset +0s
segment-02 will add offset +60s
segment-03 will add offset +120s
...