Is there a way to soft embed subtitles into an mp4 file without re-encoding?

Question

I am trying to add an srt file(s) to mp4 files. Is there a way to do it without re-encoding the file.

What I have tried:

Added subtitles with the handbrake-cli. While this technically worked, it obliterated the quality of the video and took a long time to re-encode the file
I tried an ffmpeg approach as found on this SO answer, but I apparently dont have the mov_text codec and no one else seems to either

There is another SuperUser Answer which suggests that I may need to look for a muxer. But that answer pertains to Mac OS only.

With VLC you could play your mp4 with srt subtitles while saving the resulting output stream to another file. That's practically re-encoding, though. — , Mar 01 '14 at 18:30

score 4 · Answer 1 · edited Apr 13 '17 at 12:37

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As explained by @axel_c, you could use mkvmerge to create a Matroska container and include the subtitles in the output:

mkvmerge -o output.mkv video.mp4 subtitles.srt

edited Apr 13 '17 at 12:37

Community

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answered Sep 19 '15 at 20:42

Peque

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score 3 · Accepted Answer · answered Mar 02 '14 at 13:36

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Try downloading the static build of ffmpeg from their download site: http://ffmpeg.org/download.html

Note, though, that mov_text seems to be a hit-and-miss situation; sometimes it works, sometimes it doesn't. You might have much better results re-muxing into a matroska container (.mkv), and play it using VLC.

answered Mar 02 '14 at 13:36

pepoluan

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OK, that did it!... great suggestion. To clarify what I did for posterity: I downloaded a newer build, 64-bit version of `ffmpeg` from [http://ffmpeg.org/download.html](http://ffmpeg.org/download.html). Once on my machine I ran the command found at this [SO Answer](http://stackoverflow.com/a/17584272/705055) referencing the newly acquired version of `ffmpeg`. The command did its thing, and the outcome was a new `mp4` with perfect subtitles. – Hari Seldon Mar 04 '14 at 23:26
@Hari thanks for the clarification; great to hear that it works :-) ... happy subtitling! – pepoluan Mar 05 '14 at 01:46

score 0 · Answer 3 · answered Jul 04 '14 at 13:06

If you're looking to embed subtitles (rather than burn) then try a free GPL software called Video Updater Tools.

It uses other tools behind the scene (like ffmpeg, mkvmerge, mp4box etc) but packaged nicely into a GUI and CLI. It works on directories recursively so you can completely automate the entire process. You can drag and drop files/folder in the GUI version or use the CLI for scripting.

It can embed SRT subtitles (and chapters from EDL) in MP4/M4V/MKV containers from EDL and SRT files.

(It can also extract subtitles from most container formats if required)

You can download it at: https://videoupdatertools.codeplex.com

Is there a way to soft embed subtitles into an mp4 file without re-encoding?

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