Spatial coding in 360-RA files about libmpeghe HOT 8 CLOSED

Hi sclsj,

Spatial coding, sometimes also referred to as “clustering”, is not part of the MPEG-H audio specification for LC profile. There is a tool in MPEG-H Audio called SOAC (Spatial Audio Object Coding), which can be used to reduce the number of objects. However, this tool is not part of the Baseline or LC profile, which are currently the relevant ones addressed in this code repository.

If you intend to go from a master-file to MPEG-H encoder input, one way to reduce the number of objects is through MPEG-H Authoring Suite (https://www.iis.fraunhofer.de/en/ff/amm/dl/software/mas.html)

from libmpeghe.

Hi sclsj,

Can you please close the issue if your query has been answered?

from libmpeghe.

Closing the issue due to no activity for long time.

from libmpeghe.

If you intend to go from a master-file to MPEG-H encoder input, one way to reduce the number of objects is through MPEG-H Authoring Suite (https://www.iis.fraunhofer.de/en/ff/amm/dl/software/mas.html)

Sorry for the late reply.

Does this also use SOAC? Or does this use a different technology?

Also, for streaming services like Tidal and Deezer, what format do they receive? If they receive the MPEG-H master instead of an encoded 360RA mp4, what process do they use to reduce the number of object to the limit of level/profile specification?

from libmpeghe.

Also, which of the following can libmpeghe take and encode (supported target format of mpeg-h conversion tool from Fraunhofer IIS):

MPEG-H Production Format (MPF)
MPEG-H BWF/ADM
3daa+wav
MPEG-MXF/S-ADM

from libmpeghe.

MPEG-H Audio has tool called SAOC (Spatial Audio Object Coding), which can be used to reduce the number of objects. However, this tool is not part of the Baseline or LC profile, which are currently the relevant ones addressed in this code repository.

The other queries related to Tidal, Deezer and MPEG-H conversion tool from Fraunhofer IIS are beyond the scope of Baseline or LC profile MPEG-H encoder.

from libmpeghe.

MPEG-H Audio has tool called SAOC (Spatial Audio Object Coding), which can be used to reduce the number of objects. However, this tool is not part of the Baseline or LC profile, which are currently the relevant ones addressed in this code repository.

The other queries related to Tidal, Deezer and MPEG-H conversion tool from Fraunhofer IIS are beyond the scope of Baseline or LC profile MPEG-H encoder.

It seems like this tool does not support input of 3daa+wav or MPEG-H BWF/ADM according to the command line options. Is there a way I can make it work?

from libmpeghe.

If you intend to go from a master-file to MPEG-H encoder input, one way to reduce the number of objects is through MPEG-H Authoring Suite (https://www.iis.fraunhofer.de/en/ff/amm/dl/software/mas.html)

Sorry for the late reply.

Does this also use SOAC? Or does this use a different technology?

Also, for streaming services like Tidal and Deezer, what format do they receive? If they receive the MPEG-H master instead of an encoded 360RA mp4, what process do they use to reduce the number of object to the limit of level/profile specification?

For future reference: I contacted Sony and they clarified that all encoding is done on the artist's/producer's side using 360 WalkMix Creator. Unlike Dolby's approach where all objects are ultimately coded into channels, Sony allows artists to specify if an object is static or dynamic. If an object is static, it get downmixed with other static objects into a predetermined channel layout, such as 4.4.4 or 5.5.0. If an object is dynamic, it gets encoded by itself.

The final product uploaded to Deezer and Tidal are either 3daa+wav (4 folders) or a mp4 container with all four levels (0.5, 1, 2, 3).

from libmpeghe.