Video merging without transcoding, perhaps?

Question

Video

Hello. In continuation of my topic , I wanted to ask if anyone has collided.
I'm merging videos with ffmpeg. In order for them to be of the same format (bitrate, frequency, resolution, etc.), you must first convert to mp4, then to ts, and only then glue them together. I have not succeeded in another way yet, maybe someone knows a faster way to do gluing videos of different formats?
To summarize:
- first I take a preview, convert it to MP4, then to TS
- then I take all the videos from the folder, convert to MP4, then to TS
- and only after that I glue the preview with all the videos.
I do everything using the ffmpeg utility and C#.
Converting to mp4 is not a fast process, a 20 minute video is converted in 7 minutes, I would like everything to happen much faster.
Please help and thank you all in advance.

Answer 1

If the video parameters are different, then you need to re-encode.
without recoding, you can merge videos with the same parameters, but in different containers.