Video scrape doesn't show videos

[Misfitz]

Pi Model or other hardware: 4 - 2GB
Power Supply used: Original Pi PSU
RetroPie Version Used: 4.7.12
Built From: Pre made SD Image on RetroPie website
USB Devices connected: PS3 controller & usb keyboard
Controller used: PS3 controller
Error messages received: none
Guide used: Retropie docs Scraper

Hello, I've searched a lot and it seems that none of the solutions I've seen is working for me.
I scraped my roms with the download video option enabled, I've tried Steven Selph's Scraper and Skycrapper, none of them working for me. When I did it with Skyscrapper, at the moment it showed in the console Video download (YES) but it just wont play it on the preview. I've tried activating OMX player (HW accelered), and makes no difference if it's on/off. This doesn't work with any roms or any emulator.
I really apreciate any help, thanks!

[sleve_mcdichael]

Scraped videos are often in yuv444p format. See here for automatically detecting and converting them to yuv420p with Skyscraper and ffmpeg. This only works when videos are first downloaded, so either rescrape all your roms with --cache refresh enabled, or see here for batch-converting the ones you've already downloaded.

[Misfitz]

@sleve_mcdichael
Thanks for your answer! I was trying to create the script and I couldn't cause I'm a newbie haha. But I figured out that I was using wifi + ethernet cable, I thought it could be the wifi connection, so I disconected it. After that I used the purge option and re-scrape again some platforms and it worked. Got almost every platform working, but I couldnt do it with nintendo 64, it just wont work. When I was scrapping, i got these error messages saying the servers were overloaded, but its okay for me.
Thank you again !