This is automatically generated.
NOTE: inner whitespace is significant.
(*) Some derivatives only apply to certain collections.

#### Derivatives for Audio Items

If your source file is format: | . . . then we will try to derive the following formats:
--- | ---
64Kbps MP3 | Flac | MP3 Sample | Ogg Vorbis | PNG | VBR MP3
3GP Audio | (*) |  | (*) | (*) | (*) |
8Kbps MP3 |  |  |  |  | (*) |
16Kbps MP3 |  |  |  |  | (*) |
24bit Flac | (*) |  | (*) | (*) | (*) |
24Kbps MP3 |  |  |  |  | (*) |
32Kbps MP3 |  |  |  | (*) | (*) |
40Kbps MP3 |  |  |  |  | (*) |
48Kbps MP3 |  |  |  | (*) | (*) |
56Kbps MP3 |  |  |  |  | (*) |
64Kbps MP3 |  |  |  | (*) | (*) |
72Kbps MP3 |  |  |  |  | (*) |
80Kbps MP3 |  |  |  |  | (*) |
96Kbps MP3 | (*) |  | (*) | (*) | (*) |
104Kbps MP3 |  |  |  |  | (*) |
112Kbps MP3 |  |  |  |  | (*) |
120Kbps MP3 |  |  |  |  | (*) |
128Kbps MP3 | (*) |  | (*) | (*) | (*) |
136Kbps MP3 |  |  |  |  | (*) |
144Kbps MP3 |  |  |  |  | (*) |
152Kbps MP3 |  |  |  |  | (*) |
160Kbps MP3 | (*) |  | (*) | (*) | (*) |
168Kbps MP3 |  |  |  |  | (*) |
176Kbps MP3 |  |  |  |  | (*) |
184Kbps MP3 |  |  |  |  | (*) |
192Kbps MP3 | (*) |  | (*) | (*) | (*) |
200Kbps MP3 |  |  |  |  | (*) |
208Kbps MP3 |  |  |  |  | (*) |
216Kbps MP3 |  |  |  |  | (*) |
224Kbps MP3 |  |  |  |  | (*) |
232Kbps MP3 |  |  |  |  | (*) |
240Kbps MP3 |  |  |  |  | (*) |
256Kbps MP3 | (*) |  | (*) | (*) | (*) |
288Kbps MP3 |  |  |  |  | (*) |
320Kbps MP3 | (*) |  | (*) | (*) | (*) |
Advanced Audio Coding | (*) |  | (*) | (*) | (*) |
AIFF | (*) |  | (*) | (*) | (*) |
Apple Lossless Audio | (*) |  | (*) | (*) | (*) |
Digital Theater Systems Audio | (*) |  | (*) | (*) | (*) |
Flac | (*) |  | (*) | (*) | (*) |
Kbps MP3 |  |  |  |  | (*) |
MIDI | (*) |  |  | (*) | (*) |
MP3 |  |  |  |  | (*) |
MP3 (other) |  |  |  |  | (*) |
Ogg Vorbis | (*) |  | (*) |  | (*) |
Real Audio | (*) |  | (*) | (*) | (*) |
Segment Data |  |  |  |  |  |
Shorten | (*) |  | (*) | (*) | (*) |
VBR MP3 | (*) |  | (*) | (*) | (*) |
WAVE | (*) |  | (*) | (*) | (*) |
WebA | (*) |  | (*) | (*) | (*) |
Windows Media Audio | (*) |  | (*) | (*) | (*) |

# Additional info on audio/video derivatives

- h.264 / mp4 derivatives:

                video (h.264):
                640x480 (width scaled if wider/narrower than 4x3 ratio)
                ~768kb/sec (maxrate)
                audio (AAC):
                stereo, 128kb/sec 44.1Khz sampling

- ogv derivatives:

                video (theora):
                400x300 (width scaled if wider/narrower than 4x3 ratio)
                target ~512 kb/sec
                audio (vorbis):
                stereo, ~128kb/sec 44.1Khz sampling

- mp3 derivatives:

                  MP3 format, stereo, lame compressor "-standard" parameter/setting
                  which targets ~140 kb/sec

# Advanced techniques and help

## To remove and/or prevent a particular derivative format

If for some reason, you prefer to not have your item create the derivative of one or more formats, you can upload to your item a special "rules" named "_rules.conf". That file should be a text file, with a single line of each format to disallow.

So, for example, to make (all videos in) a video item *not* create our "Animated GIF" and "h.264" formats, you would upload "_rules.conf" containing the following:
Animated GIF h.264

To prohibit *just* video and audio derived formats that are "lossy" (eg: mp3, ogg, mp4, ogv) you would upload "_rules.conf" containing the following:
CAT.lossy

To prohibit *all* derived formats, you would upload "_rules.conf" containing the following:
CAT.ALL

To make any previously created derivatives "disappear" after adding or updating a "_rules.conf" file to an item, use the "Item Manager" link to submit a "derive" task (which will remove the undesired derivatives). (Find the "Edit Item" link in the upper right of your item while you are logged in, click "change the information" link, click the "Item Manager" link near the top of that page, then hit the "derive" button).