Concatenated Video created with FFMPEG is longer than expected

I am using this Video-List:

file 'C:\Users\X\Documents\test\input.mp4'inpoint 00:00:02.7650000outpoint 00:00:04.7650000

and the following Command:

ffmpeg -y -safe 0 -f concat -i output.txt -map 0:v -map 0:a -c:a copy -c:v copy output.mp4

which should result in a Video with 2 Seconds in Length. But if I do a check with ffprobe I get this:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':  Metadata:    major_brand     : isom    minor_version   : 512    compatible_brands: isomiso2avc1mp41    encoder         : Lavf60.16.100  Duration: 00:00:04.85, start: 0.000000, bitrate: 394 kb/s  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 382 kb/s, 30 fps, 30 tbr, 15360 tbn (default)    Metadata:      handler_name    : VideoHandler      vendor_id       : [0][0][0][0]  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)    Metadata:      handler_name    : SoundHandler      vendor_id       : [0][0][0][0]

Whats the cause of this?