Help us keep the list up to date and submit new video software here.

            Search tool or Browse all tools by sections

Tool Description Type Rating Comment

qaac is a command line AAC/ALAC encoder frontend based on Apple encoder. Since 1.00, qaac directly uses CoreAudioToolbox.dll. Therefore, QuickTime installation is no more required. However, Apple Application Support is required. AAC-LC, AAC-HE, ALAC encoding are supported.

Free software
Win Win

Version:2.35 History


Download (direct link)

Download old versions

1 votes

Read 1

this month
total views
  Latest version:
2.35 (February 18, 2014)

Download sites:
Visit developer's site

Download qaac from our site (direct link) (2.8MB)

More download options:

Download qaac old versions

Supported operating systems:

Sections/Browse similar tools:
Audio Encoders

qaac screenshot
Click to enlarge screenshot

User options:
Email me when it has been updated    Report this tool (dead link/new version)  

Version history/Release notes:
[qaac] release 2.35 (refalac 1.35)
posted 6 hours ago by nu 774
Insert PCE in AAC payload on ADTS output when non standard channel layout such as 4ch(quad), 6ch, 6.1ch is in use.
Support 7.1ch rear for AAC (m4a/adts) by inserting PCE on qaac side. Mapping of 7.1ch rear input to 7.1ch front is dropped.
When non standard channel layout is used, PCE (program config element) is required to describe the channel layout. For MP4 container it is embedded in GASpecificConfig. For ADTS, since there's no such place in the header, PCE has to be periodically inserted in the AAC payload.

Since Apple codec doesn't support ADTS transmux, it does not insert PCE in AAC payload but writes PCE into "magic cookie" that contains GASpecificConfig. On the other hand, qaac has not been modifying AAC bitstream produced by the codec. As a natural consequence, ADTS output with non standard channel layout was lacking PCE support. This issue is fixed on this version.

As a good side effect, I also added support for 7.1ch rear. Before this version, 7.1ch rear input has been mapped to 7.1ch front as a compromise, that is not a very right thing to do. Since 7.1ch front and 7.1ch rear are the same in the AAC channel elements level (both of them are encoded as SCE+PCE+PCE+PCE+LFE), 7.1ch rear can be achieved by encoding as 7.1ch front and inserting PCE afterwards.

Since automatic mapping from 7.1ch rear to 7.1ch front is note dropped, 7.1ch rear input cannot be encoded as ALAC. It is not supported for CAF output too.

If you are a ffmpeg user, note that standard 7.1ch front AAC requires "-strict 1" to decode in the correct channel layout. It is due to historical reason that AAC encoders (including Nero and qaac) has been wildly mapping 7.1ch rear to 7.1ch front.

View full changelog

Guides and How to's:
No guides/tutorials, submit guides here.

Acronyms / Also Known As:

Comments Post comment
1 comments, Showing 1 to 1 comments

Even though I hate bloatware, installing the Apple Application Support stuff is not much worse than having Java or .Net Framework 2.0 on your HDD.

This CLI front-end does work, and this post means a big Thank-You to the author.

Posted June 09, 2012 by . Tool version 1.37 using OS WinXP
Ease of use 8 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 9 of 10

1 comments, Showing 1 to 1 comments

1 tool hits, Showing 1 to 1 tools
NEW SOFTWARE= New tool since your last visit
NEW VERSION= New version since your last visit
NEW COMMENT= New comment since your last visit

Type and download
NO MORE UPDATES? = The software hasn't been updated in over 2 years.
NO LONGER DEVELOPED = The software hasn't been updated in over 3 years.
RECENTLY UPDATED = The software has been updated the last 31 days.
Freeware = Free software.
Free software = Free software and also open source code.
Freeware/Adware = Free software but supported by advertising, usually with a included browser toolbar. It may be disabled when installing or after installation.
Free software/Adware = Free software and open source code but supported by advertising, usually with a included browser toolbar. It may be disabled when installing or after installation.
Trialware = Also called shareware or demo. Trial version available for download and testing with usually a time limit or limited functions.
Payware = No demo or trial available.
v1.0.1 = Latest version available.
Download beta = It could be a BETA, RC(Release Candidate) and even a ALPHA version of the software.
Download (direct link) = A direct link to the software download.
Download (developer's site) = A link to the software developer site.
Download (mirror link) = A mirror link to the software download. It may not contain the latest versions.
Download old versions = Free downloads of previous versions of the program.
Download 64 bit version = If you have a 64bit operating system you can download this version.
Download portable version = No installation is required, just extract the files to a folder and run directly.
Windows = Windows version available.
Mac OS = Mac OS version available.
Linux = Linux version available.
Our hosted tools are virus and malware scanned with several antivirus programs using

Rating from 0-10.

Browse software by sections
All In One Blu-ray Converters (13)
All In One DVD Converters (19)
All In One MKV to MP4/Blu-ray/AVCHD (11)
All In One Video Converters (31)
Animation (3D & 2D animation) (6)
Audio Editors (17)
Audio Encoders (61)
Audio Players (6)
Authoring (Blu-ray/AVCHD) (20)
Authoring (DivX) (5)
Authoring (DVD) (37)
Authoring (SVCD/VCD) (11)
Bitrate Calculators (7)
Blu-ray to AVI/MKV/MP4 (13)
Blu-ray to Blu-ray/AVCHD (9)
Burn (CD,DVD,Blu-ray) (22)
Camcorders/DV/HDV/AVCHD (35)
Capture (37)
CD/DVD recovery (4)
Codec Packs (8)
Codec/Video Identifiers (33)
Codecs (63)
Decrypters/Backup (Blu-ray Rippers) (7)
Decrypters/Backup (DVD Rippers) (14)
DigitalTV/DVB/HDTV (45)
DVD to AVI/DivX/XviD (19)
DVD to DVD (22)
DVD to MP4/MKV/H264 (19)
ISO/Image (15)
Linux video tools (95)
MacOS video tools (144)
Media (Blu-ray/DVD/CD) (9)
Media Center/HTPC/PS3/360 (41)
Other useful tools (104)
Photo Blu-ray/DVD/VCD (9)
Portable/Mobile/PSP/iPod (41)
Region free tools (5)
Screen capture/Screenshots (22)
Subtitle (52)
Video De/Multiplexers (50)
Video Editors (Advanced/NLE) (46)
Video Editors (Basic) (42)
Video Editors (H264/MP4/MKV/MTS) (14)
Video Editors (MPG/DVD) (20)
Video Editors (WMV/AVI) (15)
Video Encoders / Converters (143)
Video Encoders (AVI/WMV) (39)
Video Encoders (H264/MP4/MKV) (39)
Video Encoders (MPG/DVD) (26)
Video Frameservers (7)
Video Players (27)
Video Repair/Fix (16)
Video Streaming (23)
Video Streaming Recording (44)
Virtualdub tools (10)
Search   Contact us   About   Advertise   Forum   RSS Feeds   Statistics   Tools   

Site layout: Default Classic Blue

Affiliates:   VSO Software