README: removed iconv references, update envvars, update requirements (awk, xxd).

README.md

@@ -1,6 +1,8 @@
 # Required applications
 
 * ffmpeg
+* xxd (with '-r' and '-p' options)
+* awk
 
 # Usage
 
@@ -9,7 +11,7 @@ get-tracks.sh rip audio-file time-file
 ```
 
 
-`audio-file` can be in any format understood by `soxi` and `ffmpeg`
+`audio-file` can be in any format understood by `ffmpeg`
 
 In the `time-file`:
 
@@ -21,23 +23,15 @@ In the `time-file`:
 
 # Environment variables
 
-* SIMULATION [0|1]: do not invoke ffmpeg
+* SIMULATION: if non empty do not invoke ffmpeg
 * FORMAT [mp3,ogg,opus,…]: for the song file format
-* WITH_NUMBER [separator]: if not null, write song number with this separator\
-  example WITH_NUMBER=_, song names will be *1_song.opus*, *2_song.opus*, (...)
-* QUIET: if set to any value, ffmpeg commands are not displayed
-
-# Limitations
-
-This script doesn't work with UTF-8 content.
-If your file with timings contains UTF-8 characters, apply this:
-
-```
-iconv -f utf-8 -t ascii timings-file > timings-file-fixed
-```
-
-Then verify the content.
-
+* NONUMBER: if equals 1, do not write song number
+* SEPARATOR: (default: ' - '), write song number, with this separator
+  example with SEPARATOR='_': song names will be 01_song.opus 02_song.opus…
+* VERBOSITY [0-3] (default: 1)\
+  verbosity 0: no output exept errors from ffmpeg\
+  verbosity 1: simple indications on the current track being extracted\
+  verbosity 2: print actual ffmpeg commands the script currently runs
 
 # More