Split off from https://github.com/wulkano/kap/issues/429
Record long 30min video and attempt WebM export
A. When export will be slow, show a time estimate for the download

B. When export will be slow, show a warning that the export will be slow

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Comment from https://github.com/wulkano/kap/issues/429#issuecomment-375967534
@matheuss Would it be possible to parse ffmpeg's output or pass in a progress option to determine how many frames or seconds of video have been processed?
Edit: There is a progress bar already, of course! Could we just calculate the start time, percentage complete and use the two to provide an extrapolation?
Alternatively could we have a cut off where we show a warning if sending more than X mins of video to ffmpeg?
We should provide a time estimate (A).
@issuehunt has funded $100.00 to this issue.
Wasn't this issue fixed in https://github.com/wulkano/kap/pull/713?

Yup
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Most helpful comment
Yup