diff --git a/AAXtoMP3 b/AAXtoMP3
index 5524216..c24e5a6 100755
--- a/AAXtoMP3
+++ b/AAXtoMP3
@@ -579,16 +579,20 @@ do
         fi
         chapter_file="${output_directory}/${chapter_title}.${extension}"
 
-        # the ID3 tags must only be specified for *.mp3 files,
-        # the other container formats come with their own
-        # tagging mechanisms.
-        id3_version_param=""
-        if test "${extension}" = "mp3"; then
-          id3_version_param="-id3v2_version 3"
+        # Since the .aax file allready got converted we can use
+        # -acodec copy, which is much faster than a reencodation.
+        # Since there is an issue when using copy on flac, where
+        # the duration of the chapters gets shown as if they where
+        # as long as the whole audiobook.
+        chapter_codec=""
+        if test "${extension}" = "flac"; then
+          chapter_codec="flac "${compression_level_param}""
+        else
+          chapter_codec="copy"
         fi
 
         # Big Long chapter debug
-        debug_vars "Chapter Variables:" cover_file chapter_start chapter_end id3_version_param chapternum chapterNameScheme chapter_title chapter_file
+        debug_vars "Chapter Variables:" cover_file chapter_start chapter_end chapternum chapterNameScheme chapter_title chapter_file
         if [ "$((${continueAt} > ${chapternum}))" = "0" ]; then
           # Extract chapter by time stamps start and finish of chapter.
           # This extracts based on time stamps start and end.
@@ -601,8 +605,7 @@ do
             -i "${cover_file}" \
             -map 0:0 \
             -map 1:0 \
-            -acodec "${codec}" ${id3_version_param} \
-            ${compression_level_param} \
+            -acodec ${chapter_codec} \
             -metadata:s:v title="Album cover" \
             -metadata:s:v comment="Cover (Front)" \
             -metadata track="${chapternum}" \
diff --git a/README.md b/README.md
index ab3dd87..7d9fc0e 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,9 @@ bash AAXtoMP3 [-f|--flac] [-o|--opus] [-a|-aac] [-s|--single] [--level <COMPRESS
 * **-c** or **--chaptered** Output a single file per chapter. The `--chaptered` will only work if it follows the `--aac -e:m4a -e:m4b --flac` options.
 * **--continue &lt;CHAPTERNUMBER&gt;**      If the splitting into chapters gets interrupted (e.g. by a weak battery on your laptop) you can go on where the process got interrupted. Just delete the last chapter (which was incompletely generated) and redo the task with "--continue &lt;CHAPTERNUMBER&gt;" where CHAPTERNUMBER is the chapter that got interrupted.
 * **--level &lt;COMPRESSIONLEVEL&gt;**      Set compression level. May be given for mp3, flac and opus.
-
+* **--dir-naming-scheme &lt;STRING&gt;**      Use a custom directory naming scheme, with variables. See [below](#custom-naming-scheme) for more info.
+* **--file-naming-scheme &lt;STRING&gt;**     Use a custom file naming scheme, with variables. See [below](#custom-naming-scheme) for more info.
+* **--chapter-naming-scheme &lt;STRING&gt;**  Use a custom chapter naming scheme, with variables. See [below](#custom-naming-scheme) for more info.
 
 ### [AUTHCODE]
 **Your** Audible auth code (it won't correctly decode otherwise) (required).
@@ -119,6 +121,24 @@ __Note:__ At least one of the above must be exist. The code must also match the
 * The default codec is mp3
 * The default output is by chapter.
 
+### Custom naming scheme
+The following flags can modify the default naming scheme:
+* **--dir-naming-scheme**     
+* **--file-naming-scheme**    
+* **--chapter-naming-scheme** 
+Each flag takes a string as argument. If the string contains a variable defined in the script (eg. artist, title, chapter, narrator...), the corresponding value is used.
+The default options correspond to the following flags:
+* `--dir-naming-scheme '$genre/$artist/$title'`
+* `--file-naming-scheme '$title'`
+* `--chapter-naming-scheme '$title-$(printf %0${#chaptercount}d $chapternum) $chapter'`
+* If a command substitution is present in the passed string, (for example `$(printf %0${#chaptercount}d $chapternum)`, used to pad with zeros the chapter number), the commands are executed.
+So you can use `--dir-naming-scheme '$(date +%Y)/$artist'`, but using `--file-naming-scheme '$(rm -rf /)'` is a really bad idea. Be careful.
+* You can use basic text, like `--dir-naming-scheme 'Converted/$title'`
+* You can also use shell variables as long as you escape them properly: `CustomGenre=Horror ./AAXtoMP3 --dir-naming-scheme "$CustomGenre/\$artist/\$title" *.aax`
+* If you want shorter chapter names, use `--chapter-naming-scheme '$(printf %0${#chaptercount}d $chapternum) $chapter'`: only chapter number and chapter name
+* If you want to append the narrator name to the title, use `--dir-naming-scheme '$genre/$artist/$title-$narrator' --file-naming-scheme '$title-$narrator'`
+* If you don't want to have the books separated by author, use `--dir-naming-scheme '$genre/$title'`
+
 ### Installing Dependencies.
 #### FFMPEG,FFPROBE
 __Ubuntu, Linux Mint, Debian__