There’s A New Headset Connector In Town

Sony TRRRS Connector MDR-NC31EMSome time ago I published a backgrounder on 3.5mm headset connectors. It detailed a bit of history of the 1/8″ (3.5mm) mini-plug, from the Sony Walkman of old to present day. That evolution could also be described as from “Tip-Ring-Sleeve”  (TRS) to Tip-Ring-Ring-Sleeve”  (TRRS.)  That post has proven surprisingly popular.

It’s been said that the universe is continually expanding. That includes the universe of mini-plug variants. Today I got my first look at the next step in the evolution of the lowly mini-plug; TRRRS!

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Grandstream Launched A New SMB/Residential NVR

We’re very happy with the combination of a Grandstream GVR3550 Network Video Recorder (NVR) and GXV3672 IP surveillance cameras. That combination provide a reliable, affordable solution to monitoring events hereabouts. The GVR3550 accommodates a up to four, 3.5” hard drive providing up to 16 TB of space, and capable of recording up to 36(!) camera streams. 000108

This week the company launched a smaller version, the GVR3552. The half-rack-width form-factor accommodates two 2.5” hard drives, up to 4 TB in total. The storage can be arranged in RAID0 or RAID1. Two drives has bandwidth to record 16 streams at 720p or 8 streams at 1080p.


The device has an HDMI output that allows real-time monitoring of up to 4 cameras. That’s exactly right-sized for many homes and small businesses.

The list price for the GVR3552 is just $149, without hard drives, making it quite a bargain. I think it’s especially suitable for the DIY crowd, like myself.

The Kranky Geeks Had Fun in SF

Last week marked the second Kranky Geek Conference in San Francisco. This time the entire event was streamed live, and they’ve put both the recordings and slides online quickly. Kudos to those who managed to get that organized. Great work!

The lineup of presenters was first-rate, with solid representation from WebRTC leadership at Google, Microsoft & Mozilla. Of course, Emil Ivov was there talking about SFUs for Atlassian. Tim Panton build an app live on stage. Clearly, it’s worth watching the recording if you could not be in attendance.

I was especially interested in something Nils Ohlmeier, from Mozilla mentioned. He described rendering a video stream locally to a canvas, then using that canvas as a video source for the outbound stream. He further described using this capability to create an ad hoc MCU, with the browser compositing multiple video streams into one outbound stream.


Oh, the things that this could do! The most obvious thing that comes to mind is composite the camera stream along with the screen share, just like I was asking for back in December 2014.

That’s just a starting point. I can image folks like Vidpresso implementing a small video production switcher right in the browser. It’s exciting stuff. Very exciting indeed.

MOS, Podcasting, SIP Reinvites and WebRTC

podcast mic & logosAccording to popular legend, in the early days of talking movies there was a German director working in Hollywood whose pronounced accent skewed his use of English. He would call for another take of a scene, this time without recording sound. He’d yell out “Mit Out Sound!” Over the years industry professionals came to use the acronym MOS as a shorthand for recording a silent take.

Operating MOS may be occasionally useful in film, but it can be disastrous for a podcaster. When producing a podcast reliable audio is a must. Achieving this goal can be complicated when trying to connect to a distributed array of co-hosts & guests via the internet.

Using a SIP service like SIP2SIP.Info allows the use of high-performance audio codecs, like Opus, which makes for superior podcast audio. This is something that I’ve advocated for along time in my series called Making Use of HDVoice Right Now!

This week I had a Twitter exchange with veteran broadcaster and podcaster Mike Phillips about a problem with audio over a SIP connection.

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LifeHacker: Top 10 Superior Tech Products You’ll Never Go Back From

LifeHacker is part of my Feedly stream, even though I often find myself at odds with many of their assertions or recommendations. However, a few weeks back they revisited a Top 10 list that I found myself liking a lot; Top 10 Superior Tech Products You’ll Never Go Back From. In fact, I am completely in agreement. It’s all good info, and largely unexpected.
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Deal Alert: AKG K240 Headphones for just $49.99

AKG-K240-HeadphonesToday only B&H Photo Video is offering my favorite studio headphones, AKG’s legendary K240’s, for just $49.99. That’s an awesome deal! Amazon currently lists them for $81, which I originally thought was a good price.

They’re an older design, but they’re still a favorite. They’re comfortable and they sound great. In fact, this deal is so good that I ordered a spare set from B&H.

The deal is today only. So don’t delay.