Fall back to streaming_extractor_music in PATH if it exists

[Kernald]

Use case

streaming_extractor_music already present in $PATH - this simplifies the configuration slightly

Solution

If the configuration key isn't set and the binary is in $PATH, silently use it rather than failing. Otherwise, still fail as currently.

[JOJ0]

Please post an example on how the config would look like with your proposed feature.

[JOJ0]

@Kernald let me rephrase why it's not entirely clear to me what your feature request is: Are you talking about the stream extractor binary only ooor you mean that we would potentially find svm models as well in that place?

[Kernald]

I was just referring to the binary, as any folder in the $PATH should be a pretty standard location to store those binaries. As far as I know, there's no such standard location for the SVM models.

The reason I opened this issue is that I had the extractor binary in a folder in my $PATH, got an error about the binary being not found and was quite surprised, it's more about expected behaviour than simplifying the configuration file I guess.