How to add DRC data?

[xinyuwang-hotstar]

Hi team,

Can you please share an example mp4 file with loudness box -- ludt data?

Or can you please share an example of drcInputBitStream.bit, so that we can run DRC_to_MP4?

It is confusing for me about how to add ludt data.

Thanks in advance!

[xinyuwang-hotstar]

@edrthomas Could you please help?

[Frank-Ba]

The loudness/DRC Metadata is based on MPEG-D DRC. You might need to use the reference software at http://wg11.sc29.org/svn/repos/MPEG-D/Part04-Dynamic_Range_Control/ to generate the data that you need.

[xinyuwang-hotstar]

@Frank-Ba Thanks for your reply. But the link you shared is not accessible. Could you please share an example of drcInputBitStream.bit or an example mp4 file with loudness box?

[podborski]

@xinyuwang-hotstar here is a simple file with a ludt box.
https://user-images.githubusercontent.com/40244254/190010229-4c7eb4bc-4922-40ae-bfe2-9825867a778c.mp4

[xinyuwang-hotstar]

@podborski Thanks a lot!

[xinyuwang-hotstar]

Hi @podborski ,

Seems the ludt data in that mp4 file is not compatible with the ludt parsing code in this repo.

I tried to parse the DRC data with this MP4_to_DRC tool. But got below failure in LoudnessBaseAtom.c.

isobmff/bin# ./MP4_to_DRC -i ../../190010229-4c7eb4bc-4922-40ae-bfe2-9825867a778c.mp4 -b test.bit -a test.wav -t 1 -m 1 -d 5
Info: MP4 to DRC started.

Info: MP4 Inputfile: ../../190010229-4c7eb4bc-4922-40ae-bfe2-9825867a778c.mp4
Info: Audiotrack Number: 1
Info: DRC track Number: 1
Info: WAV audio output file: test.wav
Info: DRC bitstream output file: test.bit
self size: 36
self bytesRead: 19
MP4_to_DRC: /vod_v2/isobmff/IsoLib/libisomediafile/src/LoudnessBaseAtom.c:182: createFromInputStream: Assertion `self->bytesRead == self->size' failed.
Aborted
root@01e

Do you have any idea about this?

Thanks.

[Frank-Ba]

@xinyuwang-hotstar the instructions how to use the software are provided in the ISOBM FF reference software package and attached here. I am afraid that it is necessary to also have the DRC reference software from the SVN server to make it work.
ReadMe.pdf

[xinyuwang-hotstar]

@Frank-Ba Thanks, I also have seen this readme doc. But SVN is not accessible. I also tried to create new user at http://wg11.sc29.org/ , but still failed to create user. Seems http://wg11.sc29.org/ is out of maintenance.

[podborski]

I have no idea where to get the DRC reference software from @cconcolato any suggestions?

[Frank-Ba]

Please ask ***@***.*** ***@***.***>. He probably knows the location.

…

On Feb 14, 2024, at 5:20 PM, Dimitri Podborski ***@***.***> wrote: I have no idea where to get the DRC reference software from @cconcolato <https://github.com/cconcolato> any suggestions? — Reply to this email directly, view it on GitHub <#38 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALGETPSHJ3LL3JORA4CG3NLYTVPEVAVCNFSM6AAAAAAQITP3J2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNBVGIYTEOBTGQ>. You are receiving this because you were mentioned.