30c77dfb |
1 | .TH fdkaac 1 "November 2013" |
2 | .\" |
3 | .\" |
4 | .SH NAME |
5 | fdkaac \- command line frontend for libfdk-aac encoder |
6 | .\" |
7 | .\" |
8 | .SH SYNOPSIS |
9 | .B fdkaac |
10 | [-h|--help] [-p|--profile <n>] [-b|--bitrate <n>] [-m|--bitrate-mode <n>] |
11 | [-w|--bandwith <n>] [-a|afterburner <n>] [-L|--lowdelay-sbr <n> ] |
12 | [-s|--sbr-ratio <n>] [-f|--transport-format <n>] [-C|--adts-crc-check] |
13 | [-h|--header-period <n>] [-G|--gapless-mode <n>] [--include-sbr-delay] |
14 | [-I|--ignore-length] [-S|--silent] [--mov-before-mdat] |
15 | [-R|--raw] [--raw-channels <n>] [--raw-rate <n>] [--raw-format <spec>] |
16 | [--title <str>] [--artist <str>] [--album <str>] [--genre <str>] [--date <str>] |
17 | [--composer <str>] [--grouping <str>] [--comment <str>] [--album-artist <str>] |
18 | [--track <num[/total]>] [--disk <num[/total]>] [--tempo <n>] |
19 | [--tag <fcc>:<value>] [--tag-from-file <fcc>:<value>] |
20 | [--long-tag <name>:<value>] [--tag-from-json <filename[?dot_notation]>] |
21 | [-o FILE] [FILE] |
22 | .\" |
23 | .\" |
24 | .SH DESCRIPTION |
25 | .B fdkaac |
26 | reads linear PCM audio in either WAV, raw PCM, or CAF format, |
27 | and encodes it into either M4A / AAC file. |
28 | .br |
29 | If the input file is "-", data is read from stdin. |
30 | Likewise, if the output file is "-", data is written to stdout if one of |
31 | streamable AAC transport formats is selected by |
32 | .B -f. |
33 | .br |
34 | When CAF input and M4A output is used, tags in CAF file are copied into |
35 | the resulting M4A. |
36 | .\" |
37 | .\" |
38 | .SH OPTIONS |
39 | .\" |
40 | .IP "-h, --help" |
41 | Show command help |
42 | .\" |
43 | .IP "-o <FILE>" |
44 | Output filename. |
45 | .\" |
46 | .IP "-p, --profile <n>" |
47 | Target profile (MPEG4 audio object type, AOT) |
48 | .RS |
49 | .IP 2 |
50 | MPEG-4 AAC LC (default) |
51 | .IP 5 |
52 | MPEG-4 HE-AAC (SBR) |
53 | .IP 29 |
54 | MPEG-4 HE-AAC v2 (SBR+PS) |
55 | .IP 23 |
56 | MPEG-4 AAC LD |
57 | .IP 39 |
58 | MPEG-4 AAC ELD |
59 | .IP 129 |
60 | MPEG-2 AAC LC |
61 | .IP 132 |
62 | MPEG-2 HE-AAC (SBR) |
63 | .IP 156 |
64 | MPEG-2 HE-AAC v2 (SBR+PS) |
65 | .RE |
66 | .\" |
67 | .IP "-b, --bitrate <n>" |
68 | Target bitrate (for CBR) |
69 | .\" |
70 | .IP "-m, --bitrate-mode <n>" |
71 | Bitrate configuration mode. |
72 | Available VBR quality value depends on other parameters such as |
73 | profile, sample rate, or number of channels. |
74 | .RS |
75 | .IP 0 |
76 | CBR (default) |
77 | .IP 1-5 |
78 | VBR (higher value -> higher bitrate) |
79 | .RE |
80 | .\" |
81 | .IP "-w, --bandwith <n>" |
82 | Frequency bandwith (lowpass cut-off frequency) in Hz. Available on AAC LC only. |
83 | .\" |
84 | .IP "-a, --afterburner <n>" |
85 | Configure afterburner mode. When enabled, quality is increased at the expense |
86 | of additional computational workload. |
87 | .RS |
88 | .IP 0 |
89 | Off |
90 | .IP 1 |
91 | On (default) |
92 | .RE |
93 | .\" |
94 | .IP "-L, --lowdelay-sbr <n>" |
95 | Configure SBR activity on AAC ELD. |
96 | .RS |
97 | .IP -1 |
98 | Use ELD SBR auto configuration |
99 | .IP 0 |
100 | Disable SBR on ELD (default) |
101 | .IP 1 |
102 | Enable SBR on ELD |
103 | .RE |
104 | .\" |
105 | .IP "-s, --sbr-ratio <n>" |
106 | Controls activation of downsampled SBR. |
107 | .RS |
108 | .IP 0 |
109 | Use lib default (default) |
110 | .IP 1 |
111 | Use downsampled SBR (default for ELD+SBR) |
112 | .IP 2 |
113 | Use dual-rate SBR (default for HE-AAC) |
114 | .RE |
115 | .RS |
116 | .PP |
117 | Dual-rate SBR is what is normally used for HE-AAC, where AAC is encoded at half the sample rate of SBR, hence "dual rate". |
118 | On the other hand, downsampled SBR uses same sample rate for both of AAC and SBR (single rate), therefore downsampled SBR typically consumes more bitrate. |
119 | .PP |
120 | Downsampled SBR is newly introduced feature in FDK encoder library version 3.4.12. |
121 | When libfdk-aac in the system doesn't support this, dual-rate SBR will be used. |
122 | When available, dual-rate SBR is the default for HE-AAC and downsampled SBR is the default for ELD+SBR. |
123 | .PP |
124 | Note that downsampled HE-AAC is not so common as dual-rate one. |
125 | When downsampled HE-AAC is selected, |
126 | .B fdkaac |
127 | is forced to choose explicit hierarchical SBR signaling, which (at least) iTunes doesn't accept. |
128 | .RE |
129 | .\" |
130 | .IP "-f, --transport-format <n>" |
131 | Transport format. |
132 | Tagging and gapless playback is only available on M4A. Streaming to stdout is |
133 | only available on others. |
134 | .RS |
135 | .IP 0 |
136 | M4A (default) |
137 | .IP 1 |
138 | ADIF |
139 | .IP 2 |
140 | ADTS |
141 | .IP 6 |
142 | LATM MCP=1 |
143 | .IP 7 |
144 | LATM MCP=0 |
145 | .IP 10 |
146 | LOAS/LATM (LATM within LOAS) |
147 | .RE |
148 | .\" |
149 | .IP "-C, --adts-crc-check" |
150 | Add CRC protection on ADTS header. |
151 | .\" |
152 | .IP "-h, --header-period <n>" |
153 | StreamMuxConfig/PCE repetition period in transport layer. |
154 | .\" |
155 | .IP "-G, --gapless-mode <n>" |
156 | Method to declare amount of encoder delay (and padding) in M4A container. |
157 | These values are mandatory for proper gapless playback on player side. |
158 | .RS |
159 | .IP 0 |
160 | iTunSMPB (default) |
161 | .IP 1 |
162 | ISO standard (edts and sgpd) |
163 | .IP 2 |
164 | Both |
165 | .RE |
166 | .\" |
167 | .IP "--include-sbr-delay" |
168 | When specified, count SBR decoder delay in encoder delay. |
169 | .br |
170 | This is not iTunes compatible and will lead to gapless playback issue on |
171 | LC only decoder, but this is the default behavior of FDK library. |
172 | .br |
173 | Whether counting SBR decoder delay in encoder delay or not result in |
174 | incompatibility in gapless playback. You should pick which one will work for |
175 | your favorite player. |
176 | .br |
177 | However, it's better not to choose SBR at all if you want |
178 | gapless playback. LC doesn't have such issues. |
179 | .\" |
180 | .IP "-I, --ignorelength" |
181 | Ignore length field of data chunk in input WAV file. |
182 | .\" |
183 | .IP "-S, --silent" |
184 | Don't print progress messages. |
185 | .\" |
186 | .IP "--moov-before-mdat" |
187 | Place moov box before mdat box in M4A container. |
188 | .br |
189 | This option might be important for some hardware players, that are known to |
190 | refuse moov box placed after mdat box. |
191 | .\" |
192 | .IP "-R, --raw" |
193 | Regard input as raw PCM. |
194 | .\" |
195 | .IP "--raw-channels <n>" |
196 | Specify number of channels of raw input (default: 2) |
197 | .\" |
198 | .IP "--raw-rate <n>" |
199 | Specify sample rate of raw input (default: 44100) |
200 | .\" |
201 | .IP "--raw-format <spec>" |
202 | Specify sample format of raw input (default: "S16L"). |
203 | .B Spec |
204 | is as the following (case insensitive): |
205 | .RS |
206 | .IP "1st char -- type of sample" |
207 | .B S |
208 | (igned) | |
209 | .B U |
210 | (nsigned) | |
211 | .B F |
212 | (loat) |
213 | .IP "2nd part (in digits)" |
214 | bits per channel |
215 | .IP "Last char -- endianness (can be ommited) |
216 | .B L |
217 | (ittle, default) | |
218 | .B B |
219 | (ig) |
220 | .RE |
221 | .\" |
222 | .IP "--title <string>" |
223 | Set title tag. |
224 | .\" |
225 | .IP "--artist <string>" |
226 | Set artist tag. |
227 | .\" |
228 | .IP "--album <string>" |
229 | Set album tag. |
230 | .\" |
231 | .IP "--genre <string>" |
232 | Set genre tag. |
233 | .\" |
234 | .IP "--date <string>" |
235 | Set date tag. |
236 | .\" |
237 | .IP "--composer <string>" |
238 | Set composer tag. |
239 | .\" |
240 | .IP "--grouping <string>" |
241 | Set grouping tag. |
242 | .\" |
243 | .IP "--comment <string>" |
244 | Set comment tag. |
245 | .\" |
246 | .IP "--album-artist <string>" |
247 | Set album artist tag. |
248 | .\" |
249 | .IP "--track <number[/total]>" |
250 | Set track tag, with or without number of total tracks. |
251 | .\" |
252 | .IP "--disk <number[/total]>" |
253 | Set disk tag, with or without number of total discs. |
254 | .\" |
255 | .IP "--tempo <n>" |
256 | Set tempo (BPM) tag. |
257 | .\" |
258 | .IP "--tag <fcc>:<value>" |
259 | Set iTunes predefined tag with explicit fourcc key and value. |
260 | .br |
261 | See |
262 | .B |
263 | https://code.google.com/p/mp4v2/wiki/iTunesMetadata |
264 | for known predefined keys. |
265 | .br |
266 | You can omit first char of |
267 | .B fcc |
268 | when it is the copyright sign. |
269 | .\" |
270 | .IP "--tag-from-file <fcc>:<filename>" |
271 | Same as --tag, but set content of file as tag value. |
272 | .\" |
273 | .IP "--long-tag <name>:<value>" |
274 | Set arbitrary tag as iTunes custom metadata. Stored in com.apple.iTunes field. |
275 | .\" |
276 | .IP "--tag-from-json <filename[?dot_notation]>" |
277 | Read tags from JSON. By default, tags are assumed to be direct children of the |
278 | root object in JSON. Optionary you can speficy arbitrary dot notation to locate |
279 | the object containing tags. |
280 | .\" |
281 | .\" |
282 | .SH EXAMPLES |
283 | .\" |
284 | .PP |
285 | Encode WAV file into a M4A file. MPEG4 AAC LC, VBR quality 3. |
286 | .RS |
287 | fdkaac -m3 foo.wav |
288 | .RE |
289 | .\" |
290 | .PP |
291 | Encode WAV file into a M4A file. MPEG4 HE-AAC, bitrate 64kbps. |
292 | .RS |
293 | fdkaac -p5 -b64 foo.wav |
294 | .RE |
295 | .\" |
296 | .PP |
297 | Piping from |
298 | .B ffmpeg |
299 | (you need version supporting CAF output) |
300 | .RS |
301 | ffmpeg -i foo.flac -f caf - | fdkaac -b128 - -o foo.m4a |
302 | .RE |
303 | .\" |
304 | .PP |
305 | Import tag using json generated by |
306 | .B (ff|av)probe |
307 | .RS |
308 | ffprobe -v 0 -of json -show_format foo.flac >foo.json |
309 | .br |
310 | flac -dc foo.flac | fdkaac - -o foo.m4a -b128 --import-tag-from-json foo.json?format.tags |
311 | .RE |
312 | .\" |
313 | .\" |
314 | .SH NOTES |
315 | .\" |
316 | .PP |
317 | Upto 32bit integer or 64bit floating point format is supported as input. |
318 | However, FDK library is implemented based on fixed point math and only supports 16bit integer PCM. Therefore, be careful of clipping. You might want to |
319 | dither/noise shape beforehand when your input has higher resolution. |
320 | .\" |
321 | .PP |
322 | Following channel layouts are supported by the encoder. |
323 | .RS |
324 | .IP 1ch |
325 | C |
326 | .IP 2ch |
327 | L R |
328 | .IP 3ch |
329 | C L R |
330 | .IP 4ch |
331 | C L R Cs |
332 | .IP 5ch |
333 | C L R Ls Rs |
334 | .IP 5.1ch |
335 | C L R Ls Rs LFE |
336 | .IP 7.1ch |
337 | C Lc Rc L R Ls Rs LFE (7.1ch front) |
338 | .br |
339 | C L R Ls Rs Rls Rrs LFE (7.1ch rear) |
340 | .RE |
341 | .\" |
342 | .SH AUTHORS |
343 | nu774 <honeycomb77@gmail.com> |