I am trying to extract the FPS count from a string.
This string and the FPS count can be of different structure and length.

Two Examples would be:

```
"  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x480 [SAR 1:1 DAR 1:1], 868 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn (default)"
"  Stream #0:0: Video: msmpeg4v3 (MP43 / 0x3334504D), yuv420p, 320x240, 744 kb/s, SAR 1:1 DAR 4:3, 29.97 fps, 29.97 tbr, 29.97 tbn"

```

The only constant for getting the location of the FPS count is the " fps" and the ", " part in front of the number in the string.

I can get the location of the " fps" with this: `processOutput.IndexOf(" fps")`.

But because the FPS count can be of different length, I can not use this:
`processOutput.Substring(fpslocation - 5, 5);`

Is there a way to get the position of the ", " part before the number? Then I could take that as start index and the position of the " fps" part as end index.
Or can this value be filtered out even more easily?