I export videos from Descript, which has embedded subtitles, and Descript doesn't have a way to export subtitles by chapter markers; it only exports them for an entire composition.
Here's a command that extracts the embedded subtitles from a given video—and supports any format supported by FFmpeg, such as MP4, MOV, or MKV.
ffmpeg -i video.mp4 -map 0:s:0 subtitles.srt
Here's what each part of the command does.
-i video.mp4 - the input file.map 0:s:0: - maps the first subtitle track found in the video. (You can change the last digit to extract a different track, e.g., 0:s:1 for the second subtitle track.)subtitles.srt - the output file name and format, e.g, SRT or VTT.If you found this useful, let me know!