Really depends on a lot of things.

a) It seems most sites now prefer as a minimum HD footage (1920x1080). So if it's not that, except in special circumstances (i.e., unique historical/archival footage), probably won't be accepted.
b) Raw is what most people seem to upload - although I've seen some remarkable footage that I know obviously has been edited. I'd say understand what people want. If they want raw, give them raw. But if you think they'd like properly color graded clips, etc, then give them that.

While I am 'relatively' new to this video/photo game - a lot of people recommend submitting to the sites on the right, in the order listed. I haven't yet submitted to the top 3 (so I could be potentially missing out on a lot of sales at the moment) - but - those are the sites you could start with.

The time consuming aspect is titling, keywording, and editing your video clips.

Hmm 5d Mark IV - I "suppose" thats an "okay" camera

What kind of footage do you have?

Here's an example of mostly drone footage... and then there is a mix of drone+gopro footage in my other videos

https://www.youtube.com/watch?v=0VHY9H3OAFg

Hi!

There is some great footage in there that would absolutely sell.

I would not agree with "most people upload RAW". At least not most people who SELL a lot. I would say 99% of all bestsellers have been edited/post-processed quite a bit. There are definitely very few RAW shots to be seen.

Of course, be careful of over-editing, but buyers seem to prefer a finished look - ready-to-go levels of contrast, saturation etc. That being said, horrible shots with white balance from Mars also sell if the subject matter is right.

But the goal is to create bestsellers, right?

The type of clip also matters. An editorial shot of a riot should probably look as natural as possible. A slow motion clip of a mountain climber can be heavily graded and have a cinematic look.

It also depends on what camera the footage comes from of course. Usually, I wouldn't edit GoPro footage too much, because it can't handle it, and you would usually film with a finished look anyway. If you have model releases for your skydiving shots they would be great stock clips. The POV kayaking clips too.

As for drone shots, I usually pull down the contrast a bit so that highlights don't get blown out and I color grade a bit. I don't personally think that the 4k footage from Mavics/Phantoms (before the 4 Pro at least) is OK to sell as 4k, because compared to a real 4k camera, it's just not there... I know people do, but...

Also watch out for the typical "drone camera moves" = robotic pans and tilts. In my opinion, that instantly ruins a clip.

If you are a perfectionist, you will find that editing and post-processing is very time consuming. For drone shots from the cheaper drones flicker reduction and noise reduction is usually required to get a clip I would feel comfortable charging money for.

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Some people upload directly from their memory cards, but after what I've seen from forums, their huge portfolios of 10,000+ clips don't really get many sales. In my opinion, I think it's a giant waste of time.

Get the clips as perfect as you can and you will find that one really good clip will outsell 100-1,000 mediocre clips that are just mass uploaded. Not too different from stock photography. You just might want to leave a LITTLE more room for the buyer to color grade since stock footage usually needs to fit with other clips.

Some beautiful footage there. I especially liked the lone tree immersed in the water.

Increasinglydifficult, would AVCHD clips be okay to colour grade without too much damage? I would only be doing minimal grading with mine.

Yea it's Panasonic AVCHD. Hmmm Ive checked the bitrate of individual clips from my Panasonic and GoPro cameras and generally, the Panny files appear to have a higher bitrate. Some of the GoPro clips are 15469kbps and 15270kbps. Whereas two random Panasonic clips are 23050kbps and 32636kbps respectively. Recently, I did some light grading of Panasonic footage that I shot through a microscope of aquatic organisms and I didn't notice any degradation of the image. So I guess I'm good to go.

Pond5 should be one of your first ports of call. There are certain varying reasons why some people avoid the following sites, but the top Tier on the right are the highest earners on the whole... Shutterstock, Adobe, iStock, Pond5... plus VideoBlocks.

But I think most people agree that Pond5 is one of the most popular. Set your own price, 50% commission, decent sales etc.   

The newer GoPros record at 45 or 60 mbps, but of course it can be set to lower bitrates to save space, which is probably why you saw the 15 mbps clips. I wouldn't use that unless I had to though.

I have an older GoPro Hero 3 Silver and as far as I know, the bitrate can't be changed. I don't really have any choice but to use those clips for stock as Ive got some nice footage from that camera. I won't colour grade those clips however.

Though there's an additional issue. It looks like my GoPro has some dust on the sensor - sometimes it shows up as a dark spot in the footage, depending on the background colour. For some scenes, I could 'hide' that dark spot by importing the background colour from Photoshop and filling it in. Unfortunately, with some scenes with busy, constantly changing backgrounds, it would be impossible to fix.

Dust spot would have to be on the sensor. The lens has been cleaned and the dark spot appears in footage with and without the underwater housing. I wouldn't trust myself to open up the camera or the lens lest I stuff it up. I enquired about getting it serviced / cleaned at a camera shop but they said the cost would be prohibitive because of the tiny size of the sensor. The guy reckoned it would cost just as much to buy a new GoPro which is not an option for me cos money is tight at the moment.

I have filmed around 20,000 stock videos.

I record each video such that I do not need to do any editing. I avoid having to edit 99% of my work, and upload the camera native file. when I first started, I spent too much time editing mostly due to mistakes that could be corrected while recording.

it takes practice to get everything right during the recording process. but it saves tons of time.

Holy, 20k is intense! Got a link to your portfolio?

please be aware that anytime you post-process a video you will degrade the quality of the video, as compared to the original, unless you are trimming and recording to the native codec, and have software that supports storing the original frame.

the best option is to keep post-processing to a minimum.