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The only open-source AAC-LC encoder I'm aware of is ffmpeg's, which is pretty awful for quality and featureset. LAME beats the quality of ffmpeg's AAC-LLC encod

The only open-source AAC-LC encoder I'm aware of is ffmpeg's, which is pretty awful for quality and featureset. LAME beats the quality of ffmpeg's AAC-LLC encoder at similar bitrates, from what I've tried. That's a condemnation of ffmpeg and not AAC-LC, of course, but why care when libopus is right there and beats AAC-LC in a good percentage of cases. H.265/HEVC has barely gotten off the ground in adoption due to the double patent pool situation, and VVC seems unlikely to continue. VVC is a fine spec but it's too expensive to ship products with right now. JPEG-XL was never a good spec, tbh, having looked at the drafts. I don't have a copy of the ISO spec, but the draft I looked at lacked the rigor I would expect out of a modern compression system & file format -- some parts had Pi and trigonometric functions in the equations without precision bounds. It felt academic to me.

CharlesW 4y ago
> H.265/HEVC has barely gotten off the ground in adoption due to the double patent pool situation… H.265/HEVC is ubiquitous on video-focused devices. It's used in every streaming service's encoding ladder. It's used for OTA DTV. It's used for Blu-ray. It's very popular for torrents. Apple devices capture to H.265. AV1 will be (deservedly) considered wildly successful when it reaches current H.265 adoption levels, several years from now.
kasabali 4y ago
> The only open-source AAC-LC encoder I'm aware of is ffmpeg's, which is pretty awful for quality and featureset FDK is open source and decent. https://wiki.hydrogenaud.io/index.php?title=Fraunhofer_FDK_AAC https://wiki.hydrogenaud.io/index.php?title=Fraunhofer_FDK_A...
- mroche 4y ago
  FDK-AAC's license is regarded in the FOSS community as open-source, but patent encumbered. So it's up to the party shipping to the codec to determine where they fall on the spectrum of shipping patent encumbered software. In Fedora, for example, a modified version of fdk-aac is shipped, stripping out the features and functionality restricted by patents, in the fdk-aac-free package, with the more complete package shipped in RPM Fusion.
  - deleted 4y ago
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jonsneyers 4y ago
Precision bounds are in 18181-3.
JyrkiAlakuijala 4y ago
JPEG XL ISO Spec -- it is a good idea to take a look at a more recent version than the committee draft in 2019 -- it evolved quite a bit

CharlesW 4y ago

> H.265/HEVC has barely gotten off the ground in adoption due to the double patent pool situation… H.265/HEVC is ubiquitous on video-focused devices. It's used in every streaming service's encoding ladder. It's used for OTA DTV. It's used for Blu-ray. It's very popular for torrents. Apple devices capture to H.265. AV1 will be (deservedly) considered wildly successful when it reaches current H.265 adoption levels, several years from now.

kasabali 4y ago

> The only open-source AAC-LC encoder I'm aware of is ffmpeg's, which is pretty awful for quality and featureset FDK is open source and decent. https://wiki.hydrogenaud.io/index.php?title=Fraunhofer_FDK_AAC https://wiki.hydrogenaud.io/index.php?title=Fraunhofer_FDK_A...

mroche 4y ago
FDK-AAC's license is regarded in the FOSS community as open-source, but patent encumbered. So it's up to the party shipping to the codec to determine where they fall on the spectrum of shipping patent encumbered software. In Fedora, for example, a modified version of fdk-aac is shipped, stripping out the features and functionality restricted by patents, in the fdk-aac-free package, with the more complete package shipped in RPM Fusion.
- deleted 4y ago
  [deleted]

jonsneyers 4y ago

Precision bounds are in 18181-3.

JyrkiAlakuijala 4y ago

JPEG XL ISO Spec -- it is a good idea to take a look at a more recent version than the committee draft in 2019 -- it evolved quite a bit