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i have an converted .mp4 video file (or .m4v) + an .srt file.

Is there a way for me to embed this .srt file into that mp4 file without running a complete convertion?

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What you want to do is generally called muxing or re-muxing.

Have a look at Subler, it should be able to do what you want. Open your video file, then drag the srt onto the screen and save as new file.

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"Subler is an Mac OS X app created to mux mp4 files..." Just a note for anyone out there reading the thread who's not on a Mac (and since OP never mentioned/tagged an OS) – Uninspired Dec 3 '11 at 3:24

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