What are valid drc effect types? about libmpegh

[SakethSathuvalli]

Hi @sclsj,

The effect types and their descriptions are part of the MPEG-D DRC specification

[sclsj]

Thank you! Is there a specific page number / range you can give me to the list of options?

[sclsj]

OK. I saw it in Table A.45. But do I use the bit position, drcseteffect, or shortname?

[sclsj]

And how can I set a lower gain? It seems like -target_loudness does nothing.

[sclsj]

It seems like it's still not working. For example, I tried effect:10, -effect:"Fade-in", and -effect:fade which all produced the same result if the flag is not specified. I though if it doesn't change the DRC parameters (maybe a limiter to avoid clipping is always applied), it should at least change something?

[sclsj]

I'm mainly trying to get #20 fixed because I felt like there is definitely a limiter applied overall because from experimenting rendering of different channel layout it seems like individual objects are not heavily compressed. I'm trying to see what options will allow me to override the encoder settings to compress heavily.

[sclsj]

So all in all, is there any option / set of options that will allow me to override the default specification and preserve the dynamic range of the source material?

[SakethSathuvalli]

Hi @sclsj,

It is possible to extract un-rendered signals from the decoder using the -ext_ren: command line option. However, there is no option to avoid the DRC processing happening on the stream if DRC paylod is present in the encoded bit-stream.

You can refer to our wiki page on external rendering interfaces for more information on using the option -ext_ren:

Thanks!

[sclsj]

Closing as duplicate of #20 and #19