Newbie Question Thread

[audy]

Hello, I have been registered for years, and this is my first post.
I have yet conceptual doubts.

1. It is assumed that if I use a codec (or method) from a compressor (example: zlib of xtool), it is because the group of files that I want to compress, most of them have the codec zlib (right?), But in practice, how can I recognize what codecs are used in those files? maybe a scanner?

2. I have seen statements of compression method like:
5rzm = rep:300mb+delta+rzm/$wav=tta/$bmp=bmp/$jpg=jpg/$jpgsolid=precomp+rep:32

What do the characters /$ mean, what function does it meet? I have an idea, but I prefer an explanation.

3. How do we know what size of chunk set in the parameters of a precompressor (or SREP)? or what is the most advisable to use? For example, I want to compress 100 files and each of them weigh between 8 and 64 MB.