When I was planning my JMT thru hike I found hundreds of videos on Youtube, most were around 30 minutes, some around 1 hour long, almost none were useful for planning purposes.
I was looking for information on passes and especially water crossings and general scenery to get a feel for the hike overall.
Lots of information on the Yosemite lower section. Lots of selfie video while walking. But most was not very useful for planning.
When I take photos, I usually have in the back of my mind, taking photos that will aid in someones future planning, information I could have used.
So anyhow, I threw all or most of my pix and vids into a 56 min vid that I hope planners will fine useful.