Sure, I can help you with that.

To trim a section from the middle of a video file, you can use the following steps:

1. Find the start and end time of the section you want to trim.
2. Use the `-ss` flag to specify the start time and the `-t` flag to specify the duration of the section you want to trim.
3. The start time and duration should be specified in seconds.
4. The `-ss` flag must come before the `-t` flag.

For example, to trim the section from 10 seconds to 20 seconds from the middle of a video file, you would use the following command:

```
ffmpeg -i input.mp4 -ss 10 -t 10 output.mp4
```

This command will create a new video file called `output.mp4` that contains the section from 10 seconds to 20 seconds from the middle of the original video file.

In your case, you want to trim the section from the middle of a video file called `XYZ` and save the trimmed video as `XZ`. The start time of the section you want to trim is unknown, so you can use the `-ss` flag with the value `0`. This will tell ffmpeg to start the trim from the beginning of the video file. The duration of the section you want to trim is also unknown, so you can use the `-t` flag with the value `-1`. This will tell ffmpeg to trim the video until the end.

So, the command you would use to trim the section from the middle of the video file `XYZ` and save the trimmed video as `XZ` is:

```
ffmpeg -i XYZ -ss 0 -t -1 XZ
```

This command will create a new video file called `XZ` that contains the section from the beginning of the original video file to the end.

I hope this helps! Let me know if you have any other questions.
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