NEWS / ANOUNCEMENTS
17/May/2000
:
8.17 is out now, you can now automaticaly do PCM output without that Chooser Box, so it can be scripted
much happier now. Enjoy here, 8.17 zip file
Note to people who request 5.1 output in 3 wav files, yes it will be done, patience please.
3/May/2000
:
One Word, www.ac3dec.com is all you need to remember.
25/Apr/2000
:
On 24Mar I did upload a fixed ac3dec which fixed the 1 channel problem, some wierd compiler effect.
Now the update, we have a new DECODEVOB which can decode vobs into m2v/ac3 files, now this special
version will autohandle vobs that are encoded in multi angles and this will just ignore the extra
ones and only keep angle 0. Note to hackers: the angle info is stored in the Navigation Packets
in the second area of the packet.
I updated decodevob a few hours after posting , fixed a bug where the last segment in an angle segment
was misoutputed, it sok now. As far as I can see.
23/Mar/2000
:
AC3Dec fixes the status printouts after 1gig of wav written, some other cosmetic fixes in status also.
But the biggest fix is DIVX2mp4, added some extra options to restore your changes, or to do custom
ID changes, and also a bug is fixed in it.
11/Mar/2000
:
New features for ac3dec, these include better seeking without currupted audio and an insertMS option
to insert blank MS of audio into the output file, for those needing to sync properly ;)
Also decodeVOB has been fixed/updated, better support for output location which was part broken before
and also better spanning from 1 vob to a second vob without missing data at all, and also fixed
the writing of the buffered IO which didnt flush the cache if it finished half way into a block. Its all technical
so basicly you just gota know that its all ok now. And also you can specify the buffer sizes to with -savesize and -preloadsize
options to maxmize you thruput. Having a brand new fast HD sure makes things fast. Decode time for me of a 2:30hr ac3
took 14minutes. So download away dudes.
05/Mar/2000
:
Ok, a small fix for ac3dec, just the last buffer wasnt outputting nicely, and some other minor bits
fixed and you can now optionly decide the output buffer size too. AAC code started, but not complete
or working yet. So .814 ready now. Grab it.
29/Feb/2000
:
Decodevob has been updated with a little better option, you can specify the output drive now, enjoy all.
Also I do have a future outline of plans to share with all.
1. incorporate use of the AAC encode DLL (MPEG-2 audio) to produce mpeg-2 audio files.
This looks easy since the encode is an easy to use DLL. Also a possibility is to use the XING encoder
too if you wish to make mp1-layer2/layer3 audio files quicker than the slow official implementation (why are math people so bad
at code optimization??? tables people , tsk tsk)
2. A longer term plan is to make a version of ac3dec into a perfect Decoder DLL just like the AAC
is formated so that it then as a decoder could be incorporated into mpeg2avi source, which btw at
the same time mpeg2avi could do a lot of fixes like the status info to be more ac3dec like and handle
those anoying crashes and ofcourse add cooler options to it.
14/Feb/2000
:
Heres an update of DecodeVOB 1.1 , supports a few extra commands and
multi vob files spanning and also output of multiple AC3 files at once, -audio 0 -audio 1, you can
put multiple of these in.
Not to mention ac3dec has gone to .8.13, just a few optimizations
in the heaftiest area (mantisa) and also more efficient buffered output to make the HD happy.
Made a new program, DIVX2MP4, this will re-convert an AVI/ASF back to MPEG4-v3
codec IDs from the DIVX one, why? because we dont want stupid ASF files dependant on a codec which
is hard to find , we want an ASF made with the latest codec and also be able to play back on
any Windows OS too. Use it if you like, if not, I dont care, but remember, all the DIVX codec is, is
the true mpeg4 codec , just the ID changed to make it work in AVIs, (Why oh why is it called divx,
tsk tsk tsk)
05/Feb/2000
:
Been re-writing the VOB reader in a seperate project for you all to try, get the program
DecodeVOB , ofcourse its in source and reads/decodes vob really fast and saves
out the m2v or ac3 file. Enjoy it. Its a hell smaller/easier to read than BBDMUX stuff and faster. Feel free
to incorporate it into your own code, this should without too much trouble apear in ac3dec later.
Also ac3dec as a few tiny more features , thats all for now, enjoy your transcoding. Dont forget, keep reading
2600, Viva La Resistonce and freedom to all.
25/Jan/2000
:
I think I fixed the high pitch sound, blame optimization code in uncouple.c, it should be fine, testing on one
file I could hear an improvement.
29/Nov
:
Patience... been taking a break lately, will make a major improvement soon in terms of speed + more
cool options.
10/Nov
:
New
beta code, in_ac3.dll is a plugin for Winamp to play AC3 files, its more or
less working still needs some work for perfect use ,but its at least there.
-44100 from 48khz conversion seams to sound ok, so give that a try.
8/Nov :
Thanks for all your emails, too busy to email all individualy,
but I addressed all bugs/problems , you can use dvdsoft.de's forum also to address
features. If you get wierd high pitch audio effects, thats some core level maths
stuff, I am talking to the original author on possible fixes, but only some
files seam to do that, not all.
WHAT IS IT?
Basicly its VOBtoWAV, just try it. This source is based on the previous ac3decode
v0.05 from the author of mpeg2avi.
WHERE IS IT?
Its here, just download zip and run the program
, or download the zipped source code is the
full source code to the program. The code is released in free source form because I like releasing
source codes, and to any one else that doesnt, whats the problem? scared of lamers ripping you off? Thats just FUD, have the
guts guys, release the source, then at least things can be shared/fixed to the better. The original
0.5 version can be found here too ac3dec05.zip
DOWNLOADs HERE
ac3decode 0.8.14
ac3decode 0.8.15
ac3decode 0.8.16
ac3decode 0.8.17
ac3decode source code
ac3dec05.zip original
DecodeVOB 1.4
DIVX2MP4 V2
VirtualDub 1.3c Source code
Ac3 Spec pdf file
ASF Public Specification Version 1.0 (02/98)
MPEG2 (AAC) Encoder source code
Mpeg2AVI-b34 source is here
WHAT NOW?
Run it with "ac3dec file.vob outfile.wav" and select the code in the gui and
hit OK, then it will convert the vob to the new file. At any time you can hit
'Q' to stop it' ac3dec.exe is a Win32 command-line application. It must be run
from a DOS-box.
C:\> ac3dec.exe >input file< [optional output filename]
If the output-filename is supplied, ac3dec will create a WAVE file. Otherwise,
the decoded audio samples are sent to a waveOut device. AC3DEC can only play
AC3 bitstreams. AC3 Bitstreams may be in raw form (*.AC3) or part of an unencrypted
VOB file. AC3DEC does not play MPEG-audio streams.
Playback control is very limited : 'PAUSE' and 'QUIT'
COMMAND ARGS
optional : -pcmwav FILE - output data to a PCM WAV file without the Chooser Box optional : -wav FILE - output data to a WAV file optional : -pcm - automaticly select PCM output with no Chooser Dial optional : -seek # - seek to VOB LBA position (ie which sector) optional : -seekmb # - seek to file Megabyte position optional : -insertms # - insert X ms amount of silence at the start optional : -allvobs - span over multiple VOB files automaticly optional : -substream 0x## - only decode X subtream (hexformat, 0x81) optional : -overwrite - overwrite output wav file without asking. optional : -blocksize - file writing buffer size. optional : -gain # - adjust global output gain (1..100) percent optional : -gain2 # - adjust global output inverse-squared gain (1..500) percent optional : -gaincenter # - adjust centre channels gain level (1..500) optional : -gainrear # - adjust rear channels gain level optional : -gainlfe # - adjust lfe channel gain level optional : -zerocenter - silence centre channel optional : -zerorear - silence rear channels optional : -zerolfe - silence lfe channel optional : -length - limit the length of the decode to X seconds optional : -info - show VOB summary information optional : -44100 - convert the 48000 stream to 44100 allowing othe codecs/formats FUTURE TODOs More speed Angle handeling ------------ realtime playback keyboard commands ----------- 0 - 9 : switches substreams in real time (0x80 to 0x89) A,Z : + or - Gain Level S,X : + or - Gain Rear Level D,C : + or - Gain Center Level F,V : + or - Gain LFE Level W : Zero Rear Gain Level E : Zero Center Gain Level R : Zero LFE Gain LevelNo error - Couldn't open file ? < > : Fastforward/Rewind 500 LBAs
Revision history
v0.8.17- added -pcmwav so you can automaticly output to pcm wavs without chooser box
v0.8.16- status output fixed where it wouldnt wrap to next line.
v0.8.15- better seeking to ac3 data.
insertms option added to add blank silence at the front.
aac stuff is still in beter, its in the source but commented out because its not working.
v0.8.14- buffered write can be set to any size, and some other new args too.
last buffer also is saved properly.
v0.8.13- Optimized mantisas to be faster (3%), still the bbdemux code is holding it back
the new vob decoder has not yet been inserted.
Added buffered output, so only every 300k is written, not every small block.
All in all should be faster.
v0.8.12- Nothing amazing, just a SkipForward/Backword command in realtime listening.
So if its working for you, no need to download it.
v0.8.11- Fixed high pitch sound errors, I hope.
v0.8.10- made status nicer so it doesnt overlap 80 columns
we now have a beta in_ac3.dll plugin for Winamp
slightly speeded up math code too, but the de-mux is whats killing
its speed now, that is hell crap code that needs replacement soon.
Btw, I forgot to mention that the -44100 conversion option seams to work
ok.
v0.8.9 - added fixed elapsed time value (blame old relic code from mpeg2avi)
added heaps of realtime options for switching streams/ changing volumes
fixed -length option where it would do one more second before
v0.8.8 - again, fixed the EOF detection for all levels, should be ok now.
made -info act just like BBDMUX
spanning is 100% now with correct EOF checks etc...
version info printed all the time
v0.8.7 - again, fixed the EOF detection for all levels, should be ok now.
added more stat info at the end for 'jmm'
v0.8.6b- fixed reading of ac3 files, detects EOF nicely, sorry, there was
lots of messy code to go through.
v0.8.6 - fixed writing last segment of data, and added more precision to
output seconds status, fixed ac3 input reading. Thanks for checking
DanniDin.
v0.8.5 - correctly does multi vob spanning, ie doesnt miss packets and works
together with any stream
added option to kill rear/centre/lfe channels if you want to.
v0.8.4 - hopefully a bit more speedier, if you notice
- more stats/info in realtime
v0.8.3 - 50% faster so it can now basicly do 3x realtime decoding.
- added -info option to show VOB stream infos
- added -reargain for adjusting audio
- its handles premature ending VOBs nicely, without failing/falling over
- added more stats to the status texts
v0.8.2 - Audio center channel gain added
- Seek option now works properly
- the substream option works now correctly, finaly
- added max length ability, so you can decide to only
decode 10 minutes or 83 minutes exactly, either use HH:MM:SS or seconds value
v0.8.1- substream args fixed, whoops
- added another inverse squared curved gain control to volume enhancement
use as -gain2 {1...900} just experiment
v0.8 - Audio output gain added, use -gain 1 to 500 for percent.
it is a sliding gain, so only quieter sounds are made louder
without the loud sounds distorting.
v0.7 - audio downmixes speedups for other downmix combos
added working multivob support, any blah_1.vob goes to blah_2.vob
etc.. until 9
substream support added via -substream command, use 0x81 or 0x80
as the hex codes
* gain control is coming
v0.6 - handles more codecs
much faster decoding
handles stdin via -- filename (experimental)
cool processing speed statistics
* multi vob source support is in experimentation
* ground work being done for 48000hz to 44100 live conversion
v0.05 - updated bit_allocate.c (0.5.5), should fix compatibility problems
with some AC-3 bitstreams.
corrections to downmix.c, rematrix.c,
added phase-inversion to uncouple.c
minor cosmetic changes (statistics report) to user interface
v0.04 - lfe-channel now mixed at +10dB (instead of +9dB)
improved resistance to "bad AC3 frames"
updated downmix module (still not thoroughly tested)
v0.03 - ac3dec_mci renamed to ac3dec_wave, to avoid confusion
added ACM (audio compression manager) support, file output
added downmix module
v0.02 - integrated BBDMUX with ac3dec_mci, allows ac3dec
to directly demux AC3 audiostream (0x80BD) from *.VOB files
(unencrypted VOB files only!)
v0.01 - first release of AC3DEC for Win32 (ac3dec_mci),
output to Windows wave routines (waveOut library)