I'm trying to write a program to scan videos, find what languages the audio and subtitles are available in, and then use those findings for input.

Currently, I'm generating the output with this:

```
with open('output.txt', 'wt') as output_f:
    p = subprocess.Popen(command, stdout=output_f, stderr=output_f)

```

Here's the bit of text from my scan that I need.

```
  + audio tracks:
    + 1, Japanese (aac) (2.0 ch) (iso639-2: jpn)
  + subtitle tracks:
    + 1, English (iso639-2: eng) (Text)(SSA)

```

So I need to find out what number is in front of Japanese, but only after it comes after "audio tracks"

Similarly, I need to find what number is in front of English, but only after it comes after "subtitle tracks"

I'm pretty sure I need to use Regular Expressions to do this, but I'm lost on where to begin.