Looking for a eac3 7.1 encoder

[tebasuna51]

Originally Posted by Balling

... DRC is required to get good quality in AN ENCODER. FFmpeg not having it may be one of key reasons it perfoms bad for eac3.

The metadata DRC can help for old and slow decoders, but with modern and fast decoders the metadata in DD encodes aren't needed at all.
There are filters like 'night mode' than can do the job on the fly over any codec.
For that ffmpeg not need at all create those unnecesary DRC metadata.

[Balling]

Originally Posted by SeeMoreDigital

A fair amount has been padded from 16 to 24-bit!

Maybe, but only if the source was 8-bit.... But who would do that? Certainly no commercial provider!

Yes, but there is no way to tell that before decoding, okay? The metadata is not there, which means you should decode always to 24 bits. The variant of TrueHD called MLP does have such metadata.

[pcroland]

Originally Posted by tebasuna51

If DEE can't use the None preset at least use always the Music Light preset.

Changed the default DRC to music_light in deew, thanks for the info.

deew 2.6.0:
- changed default DRC to music_light, which is closer to the missing
  none preset: https://forum.doom9.org/showpost.php?p=1972689&postcount=136
- fixed DRC option not being applied for stereo TrueHD encodes
- colorized argparse's help a little bit
- renamed -t/--threads to -in/--instances to be more accurate,
  since one DEE instance can use 2 threads. see -h for more info

I'm thinking about implementing the none preset with a binary edit. Do you know which bits should be replaced with what? If i recall correctly you have to do that for every frame, right?

[tebasuna51]

Originally Posted by pcroland

...
I'm thinking about implementing the none preset with a binary edit. Do you know which bits should be replaced with what? If i recall correctly you have to do that for every frame, right?

Read the E/AC3 syntax here

Each frame have 6 Audio Blocks (point 5.2 in pdf) and for each Audio Block there are the DRC values (7.7): "The bit code of ‘0000 0000’ indicates 0 dB (unity) gain"

You must replace by 0's in each Audio Block in each audio frame, the problem is locate these bits. You must know the size of bsi (5.3) and the audblk syntax (5.4.3)

[pcroland]

So it's not that easy to implement. Do you know a working tool for it by any chance?

[tebasuna51]

No, sorry.