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116 Flix Engine Linux Module Documentation
5.29 Lowpass
5.29.1 Detailed Description
The lowpass audio filter is a filter to attenuate sounds in the audio track that are higher than the cutoff
frequency. In other words, low frequencies are passed by the filter, and high frequencies are stopped.
Example Usage:
sc = Flix2_AddFilter(&filter, flix, FE2_FILTER_LOWPASS);
// Cut off frequencies above 10khz
if(sc == ON2_OK)
sc = Flix2_FilterSetParam(filter, FE2_LOWPASS_CUTOFF, 10000.0);
Additional References:
Cookbook formulae for audio EQ biquad filter coefficients by Robert
Bristow-Johnson
Defines
• #define FE2_FILTER_LOWPASS
Filter name for use with Flix2_AddFilter().
• #define FE2_LOWPASS_Q
Filter parameter for shape constant ("Q" coefficient).
• #define FE2_LOWPASS_CUTOFF
Filter parameter for cutoff frequency.
5.29.2 Define Documentation
5.29.2.1 #define FE2_FILTER_LOWPASS
Filter name for use with
Flix2_AddFilter().
Definition at line 46 of file lowpass.h.
5.29.2.2 #define FE2_LOWPASS_CUTOFF
Filter parameter for cutoff frequency.
This is the filter’s "corner" frequency. Components of the sound track with frequencies higher than this
frequency will be attenuated. If very precise control of the cutoff frequency is required, note that the
response of the filter at this frequency is -3db. Note that the maximum frequency is always half of the sam-
pling rate of the produced file (5512.5/11025/22050 for sample rates Hertz11025/Hertz22050/Hertz44100
respectively).
Definition at line 69 of file lowpass.h.
Generated on Tue Jul 20 17:39:03 2010 for Flix Engine Linux by Doxygen
- 8.0.17.1 1
- Generated by Doxygen 1.5.2 1
- Contents 3
- Flix Engine Documentation 7
- 1.5 Support Options & FAQ 8
- 4 Flix Engine Documentation 10
- Chapter 2 11
- Flix Engine Linux File Index 13
- Flix Engine Linux Page Index 15
- Flix Engine Linux Module 17
- Documentation 17
- CodecGetParam() 18
- 5.2 Deprecated 19
- 5.2.2 Function Documentation 20
- 5.3 Codecs 27
- 5.4 Common Codec Parameters 28
- 5.5 Video Codecs 30
- 5.6 Audio Codecs 31
- 5.7.1 Detailed Description 32
- 5.7.2 Define Documentation 33
- 5.8 AAC+ 34
- 5.8.2 Define Documentation 35
- 5.9 AMR_NB - FFmpeg 36
- 5.9.2 Define Documentation 37
- 5.10 H263 - FFmpeg 38
- 5.11 H264 41
- 5.11.3 Define Documentation 42
- 5.11.4 Typedef Documentation 44
- 5.12 MP3 - LAME 45
- 5.12.2 Define Documentation 46
- 5.12.3 Typedef Documentation 47
- 5.13 libvorbis - FFmpeg 48
- 5.14 VP6 49
- Codec name 50
- Advanced VP6 settings 51
- CBR-Specific 51
- VBR-Specific 51
- 5.14.4 Define Documentation 52
- 5.14.5 Typedef Documentation 58
- 5.15 VP6 with Alpha 59
- 5.15.2 Define Documentation 61
- 5.16 VP8 68
- 5.16.2 Define Documentation 70
- 5.17 Encoding Statistics 77
- 5.18 Filters 82
- 5.19 Video Filters 83
- 5.20 Audio Filters 84
- 5.21 Deinterlace 85
- 5.21.2 Define Documentation 86
- 5.21.3 Typedef Documentation 86
- 5.21.5 Function Documentation 86
- 5.22.1 Detailed Description 88
- Deprecated functions 88
- 5.22.2 Define Documentation 89
- 5.22.3 Function Documentation 91
- 5.23 Blur 99
- 5.23.2 Define Documentation 100
- 5.23.3 Typedef Documentation 100
- 5.24 Crop 102
- 5.24.2 Define Documentation 103
- 5.24.3 Function Documentation 104
- Deprecated 106
- 5.25 Cut 107
- 5.25.2 Define Documentation 108
- 5.25.3 Function Documentation 109
- 5.26 Denoise 113
- 5.27 Frame Rate 114
- 5.27.2 Define Documentation 115
- 5.27.3 Function Documentation 115
- 5.28 Highpass 120
- 5.29 Lowpass 122
- 5.30 Mirror 124
- 5.31 Overlay (Watermark) 126
- Enumerations 128
- 5.31.2 Define Documentation 128
- 5.31.4 Function Documentation 132
- 5.32.1 Detailed Description 140
- 5.32.2 Define Documentation 142
- // output PNGs to directory 147
- 5.33 Resample 148
- 5.34 Rotate 149
- 5.35 Scale 150
- 5.35.3 Define Documentation 151
- 5.35.4 Function Documentation 152
- 5.36 Sharpen 157
- 5.37 Flix Engine API 158
- 5.38 Main Engine Interface 159
- 5.38.2 Function Documentation 162
- ’server:port’ 163
- 5.39 Flix Engine Core Library 175
- Remarks: 178
- 5.40 Filter Manipulation 179
- 5.41 Codec Manipulation 183
- 5.42 Muxer Manipulation 187
- 5.43 Frame Server API 191
- Functions 192
- 5.43.4 Function Documentation 193
- 5.44 Deprecated 197
- 5.45 Muxers 198
- 5.46 FLV 199
- Typedefs 200
- 5.46.4 Define Documentation 201
- 5.46.5 Typedef Documentation 202
- 5.47 FXM 204
- 5.47.4 Define Documentation 205
- 5.47.5 Typedef Documentation 206
- 5.48 3GPP - FFmpeg 207
- 5.49 3GPP2 - FFmpeg 209
- 5.50 MOV - FFmpeg 211
- 5.50.3 Define Documentation 212
- 5.51 MP4 - FFmpeg 213
- 5.52 SWF 215
- 5.52.3 Define Documentation 220
- 5.52.5 Function Documentation 225
- 5.53 WebM - FFmpeg 248
- 5.54 Base Types 249
- 5.54.1 Define Documentation 250
- 5.54.2 Typedef Documentation 250
- 5.55 Video Encoding Options 254
- 5.56 Deprecated 259
- 5.56.2 Function Documentation 261
- Chapter 6 273
- 6.3.1 Detailed Description 275
- 6.4.1 Detailed Description 277
- 6.5.1 Detailed Description 278
- 6.6.1 Detailed Description 279
- 6.8.1 Detailed Description 281
- 6.9.1 Detailed Description 282
- 6.10.1 Detailed Description 283
- 6.11.1 Detailed Description 284
- 6.12.1 Detailed Description 285
- General VP6 settings 285
- 6.13.1 Detailed Description 287
- 6.14.1 Detailed Description 289
- 6.15.1 Detailed Description 291
- 6.16.1 Detailed Description 292
- 6.17.1 Detailed Description 293
- 6.18.1 Detailed Description 294
- 6.19.1 Detailed Description 295
- 6.20.1 Detailed Description 296
- 6.21.1 Detailed Description 297
- 6.22.1 Detailed Description 298
- 6.23.1 Detailed Description 299
- 6.24.1 Detailed Description 300
- 6.25.1 Detailed Description 301
- 6.26.1 Detailed Description 302
- 6.27.1 Detailed Description 303
- 6.28.1 Detailed Description 305
- 6.29.1 Detailed Description 307
- 6.30.1 Detailed Description 308
- 6.31.1 Detailed Description 309
- 6.32.1 Detailed Description 310
- 6.33.1 Detailed Description 311
- 6.33.2 Define Documentation 315
- 6.33.3 Typedef Documentation 316
- 6.34.1 Detailed Description 317
- 6.35.1 Detailed Description 318
- 6.36.1 Detailed Description 320
- 6.37.1 Detailed Description 321
- 6.38.1 Detailed Description 323
- 6.39.1 Detailed Description 324
- 6.39.2 Define Documentation 324
- Attention: 325
- 6.40.1 Detailed Description 326
- 6.41.1 Detailed Description 328
- 6.42.1 Detailed Description 329
- 6.42.2 Define Documentation 330
- 6.43.1 Detailed Description 331
- 6.44.1 Detailed Description 332
- 6.45.1 Detailed Description 335
- Chapter 7 341
- 7.1 About Flix Engine 337 343
- • libogg (http://xiph.org/) 343
- 7.2.2 Codec Handle Creation 346
- 7.2.3 Filter Handle Creation 346
- 7.2.4 Constants 346
- 7.2.5 Functions 347
- 7.3.1 Intel Pentium 4 540 349
- 7.3.1.1 320x240 (QVGA) 350
- 7.3.1.2 640x480 (VGA) 351
- 7.3.1.3 1024x464 352
- 7.3.2 Intel Xeon X5355 353
- 7.3.2.1 320x240 (QVGA) 354
- 7.3.2.2 640x480 (VGA) 355
- 7.3.2.3 1024x464 356
- 7.3.2.4 1280x720 (720p) 357
- 7.4 CHANGELOG 358
- 7.4 CHANGELOG 353 359
- 7.4 CHANGELOG 355 361
- 7.4 CHANGELOG 357 363
- 7.4 CHANGELOG 359 365
- 7.4 CHANGELOG 361 367
- 7.4 CHANGELOG 363 369
- 7.5 flixd man page 371
- 7.5 flixd man page 367 373
- 7.6 Samples 374
- 7.7 Overview 375
- 7.8 Command Line 377
- 7.9 Command Line 379
- 7.10 Command Line 381
- 7.10 Command Line 377 383
- 7.11 CGI 384
- 7.11 CGI 379 385
- 7.11 CGI 381 387
- 7.11 CGI 383 389
- 7.11 CGI 385 391
- 7.11 CGI 387 393
- 7.11 CGI 389 395
- 7.11 CGI 391 397
- 7.11 CGI 393 399
- 7.11 CGI 395 401
- 7.11 CGI 397 403
- 7.11 CGI 399 405
- 7.11 CGI 401 407
- 7.11 CGI 403 409
- 7.11 CGI 405 411
- 7.11 CGI 407 413
- 7.11 CGI 409 415
- 7.11 CGI 411 417
- 7.11 CGI 413 419
- 7.11.2 process_sample.cgi 420
- 7.11 CGI 415 421
- 7.11 CGI 417 423
- 7.12 Command Line 425
- 7.12 Command Line 421 427
- 7.13 CGI 428
- 7.13 CGI 423 429
- 7.13 CGI 425 431
- 7.13 CGI 427 433
- 7.13 CGI 429 435
- 7.13 CGI 431 437
- 7.13 CGI 433 439
- 7.13 CGI 435 441
- 7.13 CGI 437 443
- 7.13 CGI 439 445
- 7.13 CGI 441 447
- 7.13 CGI 443 449
- 7.13 CGI 445 451
- 7.13 CGI 447 453
- 7.13 CGI 449 455
- 7.13 CGI 451 457
- 7.13 CGI 453 459
- 7.13 CGI 455 461
- 7.13 CGI 457 463
- 7.13.2 process_sample.php 464
- 7.13 CGI 459 465
- 7.13 CGI 461 467
- 7.14 Command Line 469
- 7.14 Command Line 465 471
- 7.15 CGI 472
- 7.15 CGI 467 473
- 7.15 CGI 469 475
- 7.15 CGI 471 477
- 7.15 CGI 473 479
- 7.15 CGI 475 481
- 7.15 CGI 477 483
- 7.15 CGI 479 485
- 7.15 CGI 481 487
- 7.15 CGI 483 489
- 7.15 CGI 485 491
- 7.15 CGI 487 493
- 7.15 CGI 489 495
- 7.15 CGI 491 497
- 7.15 CGI 493 499
- 7.15 CGI 495 501
- 7.15 CGI 497 503
- 7.15 CGI 499 505
- 7.15 CGI 501 507
- 7.15.2 process_sample.py 508
- 7.15 CGI 503 509
- 7.15 CGI 505 511
- 7.16 Deprecated List 513
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