MP4Box 2.0 to Extract Timed Text Subtitles

[vega69-ux]

I have a .mp4 file with about 30 different languages timed text subtitles. How do I extract all 30 timed text subtitles using MP4Box 2.0? Is there a way to bulk extract the 30 timed text subtitles using MP4Box 2.0 at once?

[Selur]

no, you would need a gui or something similar to do that. MP4Box has no option for bulk extraction (see: https://www.mankier.com/1/mp4box).

[vega69-ux]

Thanks. I was able to extract using MP4Box GUI. Extractions doesn't name the languages in the SRT files. Is there a way to include the names of the different languages?

[Selur]

No clue, haven't used mp4box gui for 10+ years, but unless the subtitles are tagged with their language definitely not.

[october262]

I have a .mp4 file with about 30 different languages timed text subtitles. How do I extract all 30 timed text subtitles using MP4Box 2.0? Is there a way to bulk extract the 30 timed text subtitles using MP4Box 2.0 at once?

try with ffmpeg - https://superuser.com/questions/583393/how-to-extract-subtitle-from-video-using-ffmpeg

[vega69-ux]

Can I bulk extract subtitles using ffmpeg to SRT?

[october262]

Can I bulk extract subtitles using ffmpeg to SRT?

try it with subtitle edit - https://www.reddit.com/r/ffmpeg/comments/p68gxc/how_do_i_batch_extract_subtitles/

[rbouqueau]

GPAC contributor here. Sorry I am late to the game...

MP4Box allows to extract the N-th text track using #textN. Example to extract the 30th subtitle track:

MP4Box -add source.mp4#text30 -new sub30.mp4

I'm pretty sure we can get the new 'gpac' executable to extract all subs at once. I'll let you know here.

Don't hesistate to post on our github issue tracker. You'll get some more responsive help there

[rbouqueau]

If you update to the latest GPAC, you will be able to do the following:

gpac -i source.mp4 @@0#text1 -o sub1.mp4 @@0#text2 -o sub2.mp4 ... @@0#text30 -o sub30.mp4

or even shorter using templates:

gpac -i source.mp4 @#text -o sub_$PID$_$Language$.srt

For those who don't know, the 'gpac' executable was introduce circa 2020 with the GPAC 1.0 beta. 'gpac' allows to build dynamic processing pipelines. It does not replace MP4Box completely. Wiki: https://github.com/gpac/gpac/wiki/Filters

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