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Is there a way to mux subtitles written on the fly?

For example, I want to mux a subtitle stream, with the real time clock in it, into a video stream.

ffmpeg can do that fairly easily. To adjust the command in the example, you need to to take the srt file and pass it as a second -i input file. There's some helpful guides on how to do that if you search around.

e.g. https://en.wikibooks.org/wiki/FFMPEG_An_Intermediate_Guide/s...

But I don't have a subtitles file. I would need it to read from a stream, not a static file.

Try having it read from a fifo instead.

But how? I've searched the documentation.

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