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Yahweasel / libav.js

This is a compilation of the libraries associated with handling audio and video in ffmpeg—libavformat, libavcodec, libavfilter, libavutil, libswresample, and libswscale—for emscripten, and thus the web.

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Get progress for `ffmpeg()`

reinhrst opened this issue · comments

commented

I was wondering if there is some way to get progress information when using ffmpeg()

I'm doing a simple remuxing (input.MTS -c:v copy -an -y output.mp4), and it takes 1 or two minutes for a 4GB file. This is completely acceptable, but it would be good if there is some way to keep track of progress to show some sort of progress bar.

I could manually do the remux (and have a progress bar) but I think ffmpeg does some special things that I would have to find out how to add.

I could also keep track of how many bytes were written and (considering that in this case output is going to be something like 95% of input), make something useful, but that is very specific to this case.

I guess that getting access to the default ffmpeg stdout would already do the trick (since I could parse it and get the info I need), but there may also be some other way.

commented

You can use the -progress option in ffmpeg and write to a writer device

commented

Perfect, thanks! Makes sense that the answer was in ffmpeg's command line options :)