ffmpeg 7.0.1 and Windows 7

[cholla]

@ autodidact,
First I found a download of iTunes 8.
I installed it but it does not have the files you listed.

I searched until I found this:
https://github.com/AnimMouse/QTFiles/releases
For Windows 7 32-bit i downloaded this one: QTfiles.7z
If a person has a Windows 64-bit probably this one will be correct but I did not download it:QTfiles64.7z
The QTfiles.7z has exactly the files you listed in your post #54
These worked fine. & worked to create an .aac file with the aac_at codec.
The .aac file with the aac_at codec was slightly larger than .aac file with the libfdk_aac codec.
To my ears the .aac file with the libfdk_aac codec was a little more bass.

[autodidact]

@cholla,
Thank you for sharing your findings. Should be useful for others who want to try the encoder.

[cholla]

@ autodidact,
I'm using the build you created with enable audiotoolbox (aac_at) .
As I posted I added the QTfiles.
It seemed to work correctly & does on some files.

It fails to convert this file correctly:
https://forum.videohelp.com/threads/393684-Converting-to-AAC-5-1-7-1-with-ffmpeg-chang...e2#post2773914
7.1auditionOutLeader_v2_rtb.mp4 (874.1 KB, 15 views)

Using this code:

ffmpeg -i input.mkv -c:a aac_at -aac_at_quality 0 -aac_at_mode vbr -b:a 512k -ac 8  output.mkv

The resulting file shows 8 channel but only has audio on the center channel.
This is from MediaInfo:

Format/Info: Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name: HE-AAC
Format profile: High Efficiency AAC@L6

About the same on this file:
DTS_OBJECT_EMULATOR-thedigitaltheater.mkv (408.80 MB, 4 views) posted here
I do get LF C & RF audio but no surround channels
Using this code:

ffmpeg -i input.mkv -c:v copy -c:a aac_at -aac_at_quality 0 -aac_at_mode vbr -b:a 512k -ac 8  output.mkv

Format: DTS XLL X
Format/Info: Digital Theater Systems
Commercial name: DTS-HD Master Audio
Codec ID: A_DTS

If you have the time. Does your version of ffmpeg have different results?
Like all 8 channels working.

[autodidact]

@cholla,
For both test files using your command lines I hear Front Left, Front Center, Front Right. On the first file I also hear the LFE track.

You may have to use a custom channel map. When I try different channel layouts I do hear some surround channels. For example using octagonal on the first file seems to have all channels except LFE. If it is of any help to you, the aac_at codec reports the following supported channel layouts:

[aac_at @ 073fb2c0]   mono
[aac_at @ 073fb2c0]   stereo
[aac_at @ 073fb2c0]   3.0
[aac_at @ 073fb2c0]   4.0
[aac_at @ 073fb2c0]   5.0(side)
[aac_at @ 073fb2c0]   5.1(side)
[aac_at @ 073fb2c0]   6.0
[aac_at @ 073fb2c0]   6.1
[aac_at @ 073fb2c0]   7.0
[aac_at @ 073fb2c0]   7.1(wide)
[aac_at @ 073fb2c0]   quad
[aac_at @ 073fb2c0]   octagonal

[cholla]

I will look into the aac_at codes you posted.
I thought the aac_at was working in the ffmpeg version that you fixed it in.
It does for most files.

I found this out when trying to help eddy89 in this topic:
https://forum.videohelp.com/threads/393684-Converting-to-AAC-5-1-7-1-with-ffmpeg-chang...channel-layout

aac_at can do this because it works with a Mac software eddy89 has used.

apple with afconvert (native from apple)

afconvert -f m4af -d aac -s 0 -b 512000 -q 127 7.1auditionOutLeader_v2_rtb.mp4 apple_afconvert.m4a

The fraunhoffer libfdk_aac worked for this.
I believe it is just a matter of the correct code for ffmpeg.

As autodidact posted octagonal works except no LFE.

ffmpeg -i input.mp4 -c:v copy -c:a aac_at -aac_at_quality 0 -aac_at_mode vbr -b:a 512k -channel_layout octagonal output.m4a

I tried to use ffmpeg channelmap but it always erred.
I could not figure out how to add channelmap to the code.

[autodidact]

Keep in mind that the wrapper that enables the aac_at codec only works within the limitations of the audiotoolbox support in FFmpeg itself.
FFmpeg may not support the full range of audiotoolbox options that a native tool like afconvert does. Maybe eventually it will.

I don't know if this is the problem you are having but to use channelmap, the documentation shows using single quotes:

ffmpeg -i in.mov -filter 'channelmap=map=DL-FL|DR-FR' out.wav

But on Windows you may have to use double quotes around the channelmap.

[autodidact]

Full set of updated FFmpeg builds from git master in post #33.

[pchan]

Free upgrade from Microsoft:
Win 7 to Win 10 (no restriction) - can use all the Windows recent software
Win 10 to Win 11 (TPM 2 and minimum 8thGen Intel CPU)

Getting software to work older Windows OS is getting harder everyday.

[manolito]

Full set of updated FFmpeg builds from git master in post #33.

Hi autodidact,

since your announcement did not mention it I did not really expect that your new versions would take care of my issues with my ancient hardware. Of course I tested the 64bit version anyways, and much to my surprise everything works just fine on my ancient Thinkpad.
Thank you so much!

Cheers
manolito

[geextah_2]

@autodidact,
Hi, I just wanted to say thank you! -c:a aac_at works awesome

Do you plan to release also newer builds with aac_at and libfdk_aac?

[cholla]

Thumbs up from me to autodidact also.
He helped me get this working version with aac_at and libfdk_aac.

I just pointed geextah_2 to this topic.

The version posted currently is a little newer than the one I have.
I have not yet tested the newer one but I'm certain it works.

[autodidact]

Do you plan to release also newer builds with aac_at and libfdk_aac?

Do you mean newer than the ones from a few weeks ago? I do plan to post new builds as time permits.
The current builds have audio codecs added and compatibility adjustments made based on community input
so that configuration will likely be supported going forward.

[geextah_2]

Because of the thread title, I assumed that the version you have posted on 30th Mar 2025 is 7.0.1. And when I checked "ffmpeg -version" then there is only this information "ffmpeg version N-119739-gab37c7e49f-WIN7"
So actually I'm not sure which version this is, the latest stable release at this point, should be 7.1.1

Yes and what I meant is if going forward you will keep this release up to date, because this is awesome. It is not possible for an "average" user to accomplish this. So a huge thank you again ^^

It would be good to know in which place you would post them, if this thread will be used, or a new extra one created.

[autodidact]

This thread was started when official builds of ffmpeg 7.0.1 stopped working on Windows 7 and these builds target that OS.
Of course they are perfectly good for newer Windows as well. The original versions posted were release/stable versions.
The first was 7.0.2 which was replaced with 7.1 which remains available and 7.1.1 is also still available.

The March 30 post (#33) and revised May 29 with new builds from git master which is a development branch so is newer than 7.1.1 (pre 7.2)
and has allowed for the testing of customized features.

I will definitely post new release/stable builds while development builds are less certain. I have not yet posted any release builds that contain
libfdk_aac and aac_at, only the development builds have those so far.

For the time being I will continue to post builds in this thread.

[Hemingway]

Full set of updated FFmpeg builds from git master in post #33.

Dear @autodidact,
I downloaded ffmpeg-git-ab37c7e49f-full-shared-WIN7_64.7z, but this archive seems to be broken.

$ 7z t ffmpeg-git-ab37c7e49f-full-shared-WIN7_64.7z
Archives with Errors: 1
Sub items Errors: 195

[cholla]

@ autodidact,
This is not a real problem for me as it is the only audio file of this type I have ran into.
It is in a forum post & I tried FFMPEG to convert it. To a better version of .m4a or even .aac.
https://forum.videohelp.com/threads/418520-Not-play-audio#post2776990

This is the error & some information on the file from MediaInfo:

Format : mp4a-40-0
Codec ID : mp4a-40-0


[aac @ 006545c0] Audio object type 0 is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[aist#0:0/aac @ 0067c400] [dec:aac @ 00652ec0] Error while opening decoder: Function not implemented
Error opening output file C:\Users\USER\Desktop\Temp\sampel(01).m4a.
Error opening output files: Function not implemented

If you have the time & are interested.
A newer OS & version of FFMPEG might convert this type file with no problem.

[autodidact]

@cholla,
I tested the file here with the latest ffmpeg and the result is the same.
So that audio object type is currently not supported.

For reference, this shows the currently supported types:
https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/mpeg4audio.h#L70