[FFmpeg-user] 5.1 AAC without lowpass on the LFE channel
steven at waywiser.org
Thu Sep 15 23:24:17 EEST 2022
On 9/12/22 09:33, Steven Ruppert via ffmpeg-user wrote:
> I couldn't find any references whether that's inherent to the AAC 5.1
> encoding, something that ffmpeg does, or inherent to the decoding
> process. (I did decode my same test files using something that uses
> Microsoft MediaFoundation and the LFE channel was still lowpassed).
Turns out the AAC codec inherently limits the LFE bandwidth, so there's
no way around it.
The actual ISO/IEC 13818-7:2006(en) Standard costs a bunch of money to
read as usual, but in the free glossary there is an entry:
>low frequency enhancement ( LFE ) channel: limited bandwidth channel
for low frequency audio effects in a multichannel system
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