An IR camera capturing the terminal descent of some kind of missile. Heat saturates the sensor and it had to adjust the gain to see again. IR cameras may not behave the same way as your regular phone cameras, beware when studying such vids. Also, a fast and hot projectile may look like a streak because individual pixels are saturated and the pixel may bloom. Older sensors of all kinds have serious bloom problems (if you've ever used an old digital camera outdoors you'll know this), but newer designs are quite good at limiting bloom, but you can't see the object where pixels are saturated, only the streak. So, this is unlikely anything extraordinary.
An IR camera capturing the terminal descent of some kind of missile. Heat saturates the sensor and it had to adjust the gain to see again. IR cameras may not behave the same way as your regular phone cameras, beware when studying such vids. Also, a fast and hot projectile may look like a streak because individual pixels are saturated and the pixel may bloom. Older sensors of all kinds have serious bloom problems (if you've ever used an old digital camera outdoors you'll know this), but newer designs are quite good at limiting bloom, but you can't see the object where pixels are saturated, only the streak. So, this is unlikely anything extraordinary.