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Codec2: A Whole Podcast on a Floppy Disk

auphonic.com

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Re: Codec2: A Whole Podcast on a Floppy Disk

#131
post #119

Let say we have Codec2 with WaveNet, its 3.2Kbps now does similar to may be 16Kbps EVS. ( EVS being the codec used in VoLTE, which is slightly better then even Opus in Speeches. ) What "value" / "uses" does this bring us? It cant be used in podcast because as shown it isn't very good with Music. And many podcast has Music in it. While Codec 2 with WaveNet can have a 2-4x reduction in bitrate. I cant think of a applic…

If you'd be recording a huge number of phone calls, such size reduction might bring significant savings.

Re: Codec2: A Whole Podcast on a Floppy Disk

#132
post #28

Aside from the seriously impressive WaveNet based results, I think the article doesn't do the codec itself enough justice. I mean, low-bitrate speech codecs have been around for some time (hey, vocoders are the oldest kind of audio codecs in history!), and I grew skeptical when they started to compare with mp3 and opus. But looking at this page Codec2 really holds its own when compared to AMBE and especially MELP, tw…

Here is a fascination video history of the vocoder. Complete with coverage of the early room size machines. https://video.newyorker.com/watch/object-of-interest-the-voc...

Re: Codec2: A Whole Podcast on a Floppy Disk

#133
post #7

Earlier quoted context omitted.

All the +2k podcasts hosted on Podigee (a podcast hosting company mainly known in German-speaking countries) are distributed in opus. But it is, and probably will always be, a rather niche distribution format. AAC had its moment, but MP3 is alive and kicking. Even Apple acknowledges its importance by adding support for chapter markers in iOS12.

> AAC had its moment… That moment is 15 years in with no signs of losing steam[1]. AAC effectively replaced MP3 for most online audio use cases, with podcasting as a notable exception[2]. And of course, AAC is the audio format for all basically all online video distribution. [1] Apple kicked off the transition in 2003 with the introduction of AAC-based digital music sales. [2] Because podcasting is a decentralized me…

Perceptions are probably influenced heavily by your own usage and places for consumption. I'm also in the camp of "AAC is very rare, if at all"...

Considering also that YouTube uses WebM, which very explicitly is only Vorbis or Opus for audio, "basically all online video distribution" must exclude the web's most popular video distribution site...

Re: Codec2: A Whole Podcast on a Floppy Disk

#134

The article failed to mention the original reason why Codec2 is invented. In digital amateur radio communication, currently the most widely-used codec is AMBE. But AMBE is a proprietary codec, covered by patents, unhackable - the counter-thesis of amateur radio. Codec2 was born to bring freedom to digital amateur radio communication, and technically even better than AMBE.

The article does mention why Codec2 was invented, under "Background".

Re: Codec2: A Whole Podcast on a Floppy Disk

#135
post #59

Earlier quoted context omitted.

>Actually if you're lucky and make a phone call with HDVoice, or whatever they're calling it, the quality is excellent Can confirm. I spend a lot of time in fringe reception areas, but every now and then I get a good, strong signal and the HD Voice kicks in between my iPhone and my wife's and it sounds like she's standing right next to me. It really is something to experience, especially if the previous phone call wa…

Also why no one really appreciated ISDN over here in central Europe. Yes, there are ways to do better _now_, and it would have been trivial to support channels with better codecs by negotiating something different than u-law 8kHz PCM, but back then that resulted in rather good quality. The issue was that few people got ISDN phones, which resulted in them using analog outputs on an adapter device, which got later inco…

The problem with land line voice quality is that people expect a land line phone / VoIP adapter to cost like 20 USD or Euro. At this price point you can't have fancy codecs and audio hardware that delivers a decent signal. Bad audio hardware with a good codec can actually decrease audio quality (the mic's noise no longer gets filtered as it is with 8kHz PCM).

Re: Codec2: A Whole Podcast on a Floppy Disk

#136

Having grown accustom to MP3 artifacts, it's strange to hear artifacts that are natural, but just aren't quite right. More specifically, in the male voice sample: "sold about seventy-seven", I received it as "sold about se th enty-seven".

I'd love to hear how it sounds with a 700bps stream.

Re: Codec2: A Whole Podcast on a Floppy Disk

#137
post #133

Earlier quoted context omitted.

> AAC had its moment… That moment is 15 years in with no signs of losing steam[1]. AAC effectively replaced MP3 for most online audio use cases, with podcasting as a notable exception[2]. And of course, AAC is the audio format for all basically all online video distribution. [1] Apple kicked off the transition in 2003 with the introduction of AAC-based digital music sales. [2] Because podcasting is a decentralized me…

Perceptions are probably influenced heavily by your own usage and places for consumption. I'm also in the camp of "AAC is very rare, if at all"... Considering also that YouTube uses WebM, which very explicitly is only Vorbis or Opus for audio, "basically all online video distribution" must exclude the web's most popular video distribution site...

Every YouTube video has had AAC audio from the very beginning. Same goes for every Vimeo video, every Netflix video, every Hulu video, etc. Streaming audio services like Pandora use AAC too.

That's because AAC is the only format you can count on to work on all devices, and to be hardware decoded on all devices where battery life matters.

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