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1 | ========================================================================== |
2 | fdkaac - command line frontend encoder for libfdk-aac |
3 | ========================================================================== |
4 | |
5 | Prerequisites |
6 | ------------- |
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7 | You need libfdk-aac. |
8 | On Posix environment, you will also need GNU gettext (for iconv.m4) and |
9 | GNU autoconf/automake. |
10 | |
11 | How to build on Posix environment |
12 | --------------------------------- |
13 | First, you need to build libfdk-aac and install on your system. |
14 | Once you have done it, the following will do the task. |
15 | (MinGW build can be done the same way, and doesn't require gettext/iconv) |
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16 | |
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17 | $ autoreconf -i |
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18 | $ ./configure && make && make install |
19 | |
20 | How to build on MSVC |
21 | -------------------- |
22 | First you have to extract libfdk-aac source here, so that directory tree will |
23 | look like the following: |
24 | +- fdk-aac ---+-documentation |
25 | | +-libAACdec |
26 | | +-libAACenc |
27 | | : |
28 | +- m4 |
29 | +- missings |
30 | +- MSVC |
31 | +- src |
32 | |
33 | MSVC solution for Visual Studio 2010 is under MSVC directory. |
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34 | |
35 | Tagging Options |
36 | --------------- |
37 | Generic tagging options like --tag, --tag-from-file, --long-tag allows you |
38 | to set arbitrary tags. |
39 | Available tags and their fcc (four char code) for --tag and --tag-from-file |
40 | can be found at http://code.google.com/p/mp4v2/wiki/iTunesMetadata |
41 | |
42 | For tags such as Artist where first char of fcc is copyright sign, |
43 | you can skip first char and just say like --tag="ART:Foo Bar" or |
44 | --tag-from-file=lyr:/path/to/your/lyrics.txt |
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45 | |
46 | Currently, --tag-from-file just stores file contents into m4a without any |
47 | character encoding / line terminater conversion. |
48 | Therefore, only use UTF-8 (without BOM) when setting text tags by this option. |
49 | |
50 | On the other hand, --tag / --long-tag (and other command line arguments) are |
51 | converted from locale character encoding to UTF-8 on Posix environment. |
52 | On Windows, command line arguments are always treated as Unicode. |
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53 | |
54 | Tagging using JSON |
55 | ------------------ |
56 | With --tag-from-json, fdkaac can read JSON file and set tags from it. |
57 | By default, tags are assumed to be in the root object(dictionary) like this: |
58 | |
59 | { |
60 | "title": "No Expectations", |
61 | "artist": "The Rolling Stones", |
62 | "album": "Beggars Banquet", |
63 | "track": 2 |
64 | } |
65 | |
66 | In this case, you can simply specify the filename like: |
67 | --tag-from-json=/path/to/json |
68 | |
69 | If the object containing tags is placed somewhere else, you can optionally |
70 | specify the path of the object with dotted notation. |
71 | |
72 | { |
73 | "format" : { |
74 | "filename" : "Middle Curse.flac", |
75 | "nb_streams" : 1, |
76 | "format_name" : "flac", |
77 | "format_long_name" : "raw FLAC", |
78 | "start_time" : "N/A", |
79 | "duration" : "216.146667", |
80 | "size" : "11851007.000000", |
81 | "bit_rate" : "438628.000000", |
82 | "tags" : { |
83 | "ALBUM" : "Scary World Theory", |
84 | "ARTIST" : "Lali Puna", |
85 | "DATE" : "2001", |
86 | "DISCID" : "9208CC0A", |
87 | "TITLE" : "Middle Curse", |
88 | "TRACKTOTAL" : "10", |
89 | "track" : "2" |
90 | } |
91 | } |
92 | } |
93 | |
94 | In this example, tags are placed under the object "format.tags". |
95 | ("format" is a child of the root, and "tags" is a child of the "format"). |
96 | In this case, you can say: |
97 | --tag-from-json=/path/to/json?format.tags |
98 | |
99 | For your information, ffprobe of ffmpeg project (or avprobe of libav) can |
100 | output media information/metadata in json format like this. |
101 | |
102 | Note that not all tags can be read/written this way. |