How to realize slow or fast video playback in fluent-ffmpeg

https://github.com/fluent-ffm.

I would like to ask how to use fluent-ffmpeg to achieve slow video playback,

for example, if the original video is 8 minutes, the exported video is twice as slow to 16 minutes!

< H1 > Thank you < / H1 >
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2bd5a-2b31c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bd5a-2b31c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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