How to bulk edit TikTok videos?

Hi,

I downloaded batch of TikTok videos and I would like to add a video made in canva with CTA to end of every video. So I have about 100 videos and need to merge them with specific video at the end. Do anyone knows a way how do it in bulk?

Video 1 -> merge with Canva video
Video 2 -> merge with Canva video
Video 3 -> merge with Canva video

etc.

use ffmpeg

Yes ffmpeg is the best solution. Our developer built a script that does this