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In streaming services, the atmos master undergoes spatial coding (object grouping), and then compressed. Does the same procedure happen in mpeg-h encoding (e.g. included in the specification) when there is a low object limit (e.g. 10) or is this a custom and proprietary feature developed by Sony?

Hi,

I'd like to know whether the use of this MPEG-H encoder library would require to purchase a license for MPEG-H 3D audio. I'm asking to find out whether it could be theoretically used to transmit more than 7.1 PCM channels from a Linux-based OS to consumer AV-receivers.
Also see the related issue at the Pipewire project: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/2310

The VIA Licensing Alliance lists licence fees here but it doesn't give much detail for what use cases a license would be needed and for which it might potentially not be needed.

I'm not a lawyer. I'm just curious whether it would be legally possible to include a MPEG-H 3D audio encoder possibly using this library with every Linux OS distribution without having the users to pay any licensing fees.

I was experimenting with large input channel counts and I noticed that the encoder crashes with a seg. fault when provided with a 64 channel input. This happens independent of output format. Here is a silent 1 sec 64 channel input file to repeat the problem.
64ch_1sec.wav.zip

Hello,
I can't wrap my head around ffmpeg compilation for Windows. I spent a few hours trying to achieve the plugin integration, to no avail. I am able to build the dll file, but no matter how I compile the ffmpeg (with MSYS2, or directly in min-gw64) I receive either missing dll files (libewinpthread-1.dll, libbz2-1.dll, libiconv-2.dll, liblzma-5.dll), or, when I run ./configure --disable-autodetect, I did compile ffmpeg successfully, but there was no mpegh functionality - as if it was not compiled.

After many attempts, I finally got some success: I compiled the ffmpeg with the plugin. However, I had to use the following parameters:
./configure --disable-iconv --disable-bzlib --disable-zlib --disable-lzma
Also, when I tried to "ffprobe" my Sony 360RA mp4 encoded file (which I just created with Sony software) I received the following error:

Could not find codec parameters for stream 0 (Audio: mpegh_3d_audio (mha1 / 0x3161686D), 48000 Hz, 0 channels, 333 kb/s): unspecified number of channels
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options

As a comparison, here's the regular ffmpeg output:

Could not find codec parameters for stream 0 (Audio: none (mha1 / 0x3161686D), 48000 Hz, 0 channels, 333 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options

So the compiled ffmpeg detected the codec, but still did not detect the channel number. At this point I can't tell if this is an error in my compilation, or in the plugin itself. Please advise what else should I check in order to get this to work. My main goal is to combine mpeg-h level 3 mp4 audio file with h264 video file.

Could you please provide a more detailed ffmpeg compilation instructions, preferably - without pointing to ffmpeg steps? They seem to be the most inaccurate and confusing...
Or, maybe even more ideally - could you share your compilation of ffmpeg.exe?