To skip the first 30 seconds of the video and then reverse it using FFmpeg, you can use the -ss option to specify the starting time. Here's a sample command that skips the first 30 seconds, then reverses the video and audio:
```bash
ffmpeg -ss 30 -i input.mp4 -vf "reverse" -af "areverse" output_reversed.mp4
```
Replace input.mp4 with the name of your input video file and output_reversed.mp4 with the desired name of your reversed video file.

The command above does the following:

-ss 30: Skips the first 30 seconds of the input video.
-i input.mp4: Specifies the input video file.
-vf "reverse": Applies the reverse filter to the video stream.
-af "areverse": Applies the areverse filter to the audio stream.
output_reversed.mp4: Specifies the output file name for the reversed video.
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