Aften: AC3 Encoder (FFMpeg lib) - aktuelle Version

katjarella

link: http://forum.doom9.org/showthread.php?t=113074

Zitat

Aften is a simple, open-source, A/52 (AC-3) audio encoder. Currently, it is a commandline application, but I plan to make a separate library eventually.

The name, Aften, is an acronym for:
A / Fifty-Two ENcoder
It is also Danish and Norwegian for 'evening'.

This program started as a simple cutting-out of the AC3 encoder from FFmpeg, but then I reworked the structure of the encoder a bit. Most of the basic code is still the same though. Here are some of the things I've changed so far.

Implemented my own wav reader and bitwise file writer

Converted the fixed-point algorithms to floating-point

Rearranged the methods and structures

Added stereo rematrixing (mid/side)

Added short block MDCT and block switching

Added VBR encoding mode

Future Plans

Variable bandwidth

Channel coupling

Leider noch nicht getestet, scheint aber ein int. Projekt/Programm zu werden.

LigH

Vor allem die "Future Plans" werden zeigen, wie er im Vergleich zum AC3Enc dasteht, der bisher z.B. in BeSweet verwendet wird. Von Psychoakustik ist in dieser Zuammenfassung auch noch nichts im Detail zu lesen.

katjarella

schon alleine diese Parameter puschen dieses Teil noch oben, oder kann das BeSweet auch?

Zitat

usage: aften [options] <input.wav> <output.ac3>
options:
[-h] Print out list of commandline options
[-v #] Verbosity (controls output to console)
0 = quiet mode
1 = show average stats (default)
2 = show each frame's stats
[-b #] CBR bitrate (default: none)
[-q #] VBR quality [1 - 1023] (default: 200)
[-w #] Bandwidth [0 - 60] (default: adaptive)
[-m #] Stereo rematrixing
0 = independent L+R channels
1 = mid/side rematrixing (default)
[-s #] Block switching
0 = use only 512-point MDCT (default)
1 = selectively use 256-point MDCT
[-c #] Center Channel Mix level
0 = -3 dB (default)
1 = -4.5 dB
2 = -6 dB
[-u #] Surround Channel Mix level
0 = -3 dB (default)
1 = -6 dB
2 = 0 dB
[-d #] Dolby Pro Logic Mode
0 = Ignored (default)
1 = Disabled
2 = Enabled
[-n #] Dialog Normalization level [0 - 31] (default: 31)

Alles anzeigen

mal abgesehn, von den Surround Parametern, das läßt sich in Besweet doch auch nicht einstellen.

PS: mit Muxman018 + VBR AC3 erzeugte DVD, funktionierts sogar erstaunlich sauber.

Naito

Vielleicht auch interressant: Thread über "Aften" auf Hydrogenaudio

katjarella

Zitat

Aften is a simple, open-source, A/52 (AC-3) audio encoder. Currently, it is a commandline application, but I plan to make a separate library eventually.

The name, Aften, is an acronym for:
A / Fifty-Two ENcoder
It is also Danish and Norwegian for 'evening'.

This program started as a simple cutting-out of the AC3 encoder from FFmpeg, but then I reworked the structure of the encoder a bit. Most of the basic code is still the same though. Here are some of the things I've changed so far.

* Implemented my own wav reader and bitwise file writer
* Converted the fixed-point algorithms to floating-point
* Rearranged the methods and structures
* Added stereo rematrixing (mid/side)
* Added short block MDCT and block switching
* Added VBR encoding mode

Future Plans

* Variable bandwidth
* Channel coupling

Alles anzeigen

und wenn man sich die Optionen so anschaut, lacht mein Herz:

Code

usage: aften [options] <input.wav> <output.ac3>
options:
    [-h]           Print out list of commandline options
    [-v #]         Verbosity (controls output to console)
                       0 = quiet mode
                       1 = show average stats (default)
                       2 = show each frame's stats
    [-b #]         CBR bitrate in kbps (default: about 96kbps per channel)
    [-q #]         VBR quality [1 - 1023] (default: 220)
    [-w #]         Bandwidth
                       0 to 60 = fixed bandwidth (28%-99% of full bandwidth)
                      -1 = fixed adaptive bandwidth (default)
                      -2 = variable adaptive bandwidth
    [-m #]         Stereo rematrixing
                       0 = independent L+R channels
                       1 = mid/side rematrixing (default)
    [-s #]         Block switching
                       0 = use only 512-point MDCT (default)
                       1 = selectively use 256-point MDCT
    [-cmix #]      Center mix level
                       0 = -3.0 dB (default)
                       1 = -4.5 dB
                       2 = -6.0 dB
    [-smix #]      Surround mix level
                       0 = -3 dB (default)
                       1 = -6 dB
                       2 = 0
    [-dsur #]      Dolby Surround mode
                       0 = not indicated (default)
                       1 = not Dolby surround encoded
                       [COLOR='Red']2 = Dolby surround encoded[/COLOR]
    [-dnorm #]     Dialog normalization [0 - 31] (default: 31)
    [-acmod #]     Audio coding mode (overrides wav header)
                       0 = 1+1 (Ch1,Ch2)
                       1 = 1/0 (C)
                       2 = 2/0 (L,R)
                       3 = 3/0 (L,R,C)
                       4 = 2/1 (L,R,S)
                       5 = 3/1 (L,R,C,S)
                       6 = 2/2 (L,R,SL,SR)
                       7 = 3/2 (L,R,C,SL,SR)
    [-lfe #]       Specify use of LFE channel (overrides wav header)
                       0 = LFE channel is not present
                       1 = LFE channel is present
    [-bwfilter #]  Specify use of the bandwidth low-pass filter
                       0 = do not apply filter (default)
                       1 = apply filter
    [-dcfilter #]  Specify use of the DC high-pass filter
                       0 = do not apply filter (default)
                       1 = apply filter
    [-lfefilter #] Specify use of the LFE low-pass filter
                       0 = do not apply filter (default)
                       1 = apply filter
    [-xbsi1 #]     Specify use of extended bitstream info 1
                       0 = do not write xbsi1
                       1 = write xbsi1
    [-dmixmod #]   Preferred stereo downmix mode
                       0 = not indicated (default)
                       1 = Lt/Rt downmix preferred
                       2 = Lo/Ro downmix preferred
    [-ltrtcmix #]  Lt/Rt center mix level
    [-ltrtsmix #]  Lt/Rt surround mix level
    [-lorocmix #]  Lo/Ro center mix level
    [-lorosmix #]  Lo/Ro surround mix level
                       0 = +3.0 dB
                       1 = +1.5 dB
                       2 =  0.0 dB
                       3 = -1.5 dB
                       4 = -3.0 dB (default)
                       5 = -4.5 dB
                       6 = -6.0 dB
                       7 = -inf dB
    [-xbsi2 #]     Specify use of extended bitstream info 2
                       0 = do not write xbsi2
                       1 = write xbsi2
    [-dsurexmod #] Dolby Surround EX mode
                       0 = not indicated (default)
                       1 = Not Dolby Surround EX encoded
                       [COLOR='#ff0000']2 = Dolby Surround EX encoded[/COLOR]
    [-dheadphon #] Dolby Headphone mode
                       0 = not indicated (default)
                       1 = Not Dolby Headphone encoded
                       2 = Dolby Headphone encoded
    [-adconvtyp #] A/D converter type
                       0 = Standard (default)
                       1 = HDCD

Alles anzeigen

http://sourceforge.net/projects/aften
version 0.04 released 2006-08-05

JoeB

Zitat von LigH

Vor allem die "Future Plans" werden zeigen, wie er im Vergleich zum AC3Enc dasteht, der bisher z.B. in BeSweet verwendet wird. Von Psychoakustik ist in dieser Zuammenfassung auch noch nichts im Detail zu lesen.

Kurtnoise will es in BeLight einbauen damit es mit BeSweet zusammen geht - erst dann werde ich es testen. 99,99 % meiner Encodes gehen nach he-aac.

Morpheus

Mitlerweile gibt es auch eine GUI für Aften. Die GUI ist zwar noch sehr übersichtlich aber immerhin ein Anfang.
http://kurtnoise.free.fr/index.php?dir=Aften/

bigotti5

Zitat

Die GUI ist zwar noch sehr übersichtlich aber ...

Ist das ein Nachteil?...:ani_lol: ;D

katjarella

version 0.05 released 2006-08-21

The bit allocation is significantly faster than version 0.04, making the overall encoding about 30-50% faster depending on system used.

bit allocation speedup by Prakash Punnoor
compile-time choice of using floats or doubles internally
internal restructuring of MDCT functions
more bit allocation speed-ups and bug fixes
quality=0 is now a valid setting

Rippraff

Aften 0.06 ist raus.

Changelog:

Zitat

* added SSE/SSE3 mdct code (based on vorbis lancer by blacksword8192(at)hotmail.com)
* added runtime SIMD detection code (Prakash Punnoor)
* added CMake build system with shared lib/dll support
* optional faster bit allocation by reducing accuracy/quality
* replaced MDCT code with implementation from libvorbis
* added Dynamic Range Compression encoding w/ profile selection
* improved exponent strategy decision
* accuracy increase in bit allocation
* new longhelp option for detailed commandline info

Alles anzeigen

Gibt's hier.

Cu Rippraff

LigH

Frisch im englischen doom9-Forum gemeldet:

Zitat

Aften 0.07 was released today, 25 April 2007. Here is the Changelog:
* added C++ bindings (pass -DBINDINGS_CXX=1 to cmake to build them)
* API change of helper functions
* new and more precise bitalloc algorithm
* parallelization
* optional faster exponent strategy decision
* added SSE version of window function
* added MMX and SSE2 versions of some exponent related functions
* removed old build system
* frame-independent variable bandwidth
* minimum and maximum bandwidth settings for variable bandwidth mode
* altivec support framework (by David Conrad)
* altivec MDCT (by David Conrad)

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Rippraff

Wenn man jetzt noch irgendwo einen Link finden könnte...

Cu Rippraff

LigH

Zum Selber-Compilieren: http://sourceforge.net/projects/aften

Ansonsten: kurtnoise / wisodev - sobald sie es melden.

7ven

...oder auf die erste Seite von diesem Thread :zunge:

Gruß,
7ven

Naito

Aften unterstütz E-AC3-Encoding.

LigH

Aktuelle Entwicklungen von wisodev mit Aften (insbesondere "wavtoac3encoder") gibt es jetzt bei "Google Code":

http://code.google.com/p/wavtoac3encoder/

Jetzt mitmachen!