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Using MP4Box to add subtitles in SRT format to MP4 files that will be supported by AppleTV
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| # Add English language subtitle to MP4 file | |
| MP4Box -add <Subtitle>.srt:hdlr=sbtl:lang=eng <MovieWithoutSubtitle>.mp4 -out <MovieWithSubtitle>.mp4 | |
| # Add English language subtitle with 1sec time delay to MP4 file | |
| MP4Box -add <Subtitle>.srt:hdlr=sbtl:lang=eng:delay=1000 <MovieWithoutSubtitle>.mp4 -out <MovieWithSubtitle>.mp4 |
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Thank you for this snippet, it was a big help while creating a python utility to do this for me semi-automatically https://github.com/sverrirs/mp4srtmerge