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Kagami / vmsg

:musical_note: Library for creating voice messages
https://kagami.github.io/vmsg/
Creative Commons Zero v1.0 Universal
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FR: support encoding to AAC-LC? #18

Closed henrylearn2rock closed 6 years ago

henrylearn2rock commented 6 years ago

AAC as well supported as mp3 in browers https://en.wikipedia.org/wiki/HTML5_audio#Supported_audio_coding_formats

ffmpeg native aac encoder https://trac.ffmpeg.org/wiki/Encode/AAC#NativeFFmpegAACEncoder

Licensing:

Licensee's products that are not end-user products (e.g. components or implementations) are not covered by the license and would require that the party incorporating such a component or implementation into its end-user product obtain a license.

License fees are due on the sale of encoders and/or decoders only. There are no patent license fees due for the distribution of bit-streams encoded in AAC, whether such bit-streams are broadcast, streamed over a network, or provided on physical media.

http://www.via-corp.com/us/en/licensing/aac/faq.html

What do you think? AAC should compress even better than mp3 in lower bitrate, but I'm not sure about the encoder speed. What bitrate does vmsg use? I thought you use CBR but looking at a few samples they range from 48kps to 56kps?

Kagami commented 6 years ago

You can't distribute AAC encoder in binary form per wiki. Also free implementations such as FFmpeg's are not as good as proprietary.

What bitrate does vmsg use?

VBR -V5