Hello, just wanted to know some methods to knew if a run is spliced or not...

There are multiple ways, here are some of them:
Look at the video, if it looks like a part of a video is missing it could be spliced, be aware of framedrops and lag!! Some just don't have a good enough PC to record a good run without lag!
Look at the audio with a program like Audacity, sometimes youll notice the split between the two seperate videos

It may help to look at this video:

Ill repeat myself here but just keep in mind that some people can't record with a good quality! Not every run that seems spliced at first is actually spliced, talk with the runner first!

Be aware of framedrops and lag! Nothing is worse than getting accused of cheating when actually your PC is a potato.

Occam's razor. Sometimes a stream drops some serious frames when the streamer's significant other decides to watch Netflix at the same time as the stream. It happens.

Thank you all, the video doesnt look like it has frame drops or lag. I have my suspicions because the run in question is really really good, it's his only uploaded run, and also there's no audio. But I will not accuse him of splicing, at least till I get actual proof, because he has discovered a lot of tricks for the game and actually seems he knows a lot of the game.

I know the feeling Garita, just remember, innocent until proven guilty. If you want some assistance evaluating a run, please ask I'm sure many of the mods for other games would be willing to help!

I think dumping a video on this forum with the question if it is spliced isn't the way to go..

Isn't there a small group (Discord or something) where you can dump the video you have doubts of? Privately?

Having no audio should almost be enough of a reason to reject a run outright. You shouldn’t submit a run if it’s silent or has music playing over it, etc because it’s hard to verify much of anything from just a silent video.

If you do reject the run though, at least tell the person that they need to record their audio as well as the video.

I'm with you Timmiluvs, audio should be a requirement IMO. Isn't it almost harder to omit the audio than to record it?

Ok, thanks again everyone.
I would like to know that too Seydie , it would help a lot, I didnt post the run on purpose because of what TheGreatToddman said, inoccent until proven guilty. Actually I'm not the mod nor verifier of the game, I'm new in this specific game community and wanted to help the mod with it because he also has it's doubts with this run. I will talk about this with the mod and see what do we do.

I think that's the mature thing to do, instead of the gun-slinging and shooting of accusations that seems to be popular these days.

I agree with most of what people here said but also make sure that all numbers are staying consistent (such as coins) and if someone were to have a speedrun that only shows part of the screen and is missing a piece of information that could be used to tell if it’s spliced or not that’s also suspicious (like what TheGreatToddman said about audio). Any inconsistencies in anything usually means a spliced run.