https://youtu.be/cePp4LdDdS4 Phil goes over some of the history of SDi and how we got to the current standard for 4k/UHD TV that is 12G SDi. You can snag the slides here. Keep an eye on the upcoming tech breakfasts on the main Jigsaw24 events page.
I’ve have been a terrible blogger over the last couple of months; just super-busy at work, but I have done a couple of presentations in Jigsaw24’s ongoing series of Tech Breakfasts. […]
It’s been nearly a decade since the 17th Edition came into force. Currently at the committee-stage the 18th Edition will come into force at the end of 2018. The request for comments runs through until the end of August and is well worth signing up to the BSI to read the proposal and have a [...]
I was helping to configure a new board room. This one is a tiny bit different by having two nice big TVs mounted on the walls and the cable run to each is at least 30m. So – HDMI does not reliably go that far over copper cable (I know – somebody always has an [...]
We’ve now done a couple of Sony BVM-X300 (4k/HDR OLED panel) monitors for HDR-TV deliverables to the BBC. The Beeb are behind the Hybrid Log Gamma standard, currently at 1.2 for broadcast. It’s benefits over Dolby’s 10-bit version of their Vision HDR system (also called DolbyPQ) are many and rather splendidly the DVB as well [...]
Here is a presentation I gave at the Soho Screening Rooms for one of Root6's Tech Breakfasts. You can access the notes by completing the form below: (Your details will not be passed on to any third parties and you will not be subscribed to any mailing lists)
For patch generation and LUT testing the Fuji IS-mini is hard to beat for sub-£1k. LightSpace will drive it for profiling monitors and since it has both HD/SDi and HDMI outputs it is very useful all the way to 1080 lines at 60P. […]
Because they’re semiconductors (and pretty tiny ones at that!) the pixels on modern HD monitors can become “stuck” such that you get a dot that is either black or white (in the case of all three sub-pixels; R, G, and B being stuck on or off) OR a primary (or secondary) colour where less than [...]
I've posted measurements of the degradation that cables does to video signals before; see here, but I was grabbing a couple of screen caps for an industry colleague and here they are.
It seems to be a thing for small on-set/camera monitors that they should have a hi-bright mode when being used in non-edit environments. The Boland BVB7a is an excellent little monitor and can be powered from the camera's 12v battery feed as well as coming with a DC PSU. It can take SDi (single or [...]
https://www.blackmagicdesign.com/products/miniconverters/techspecs/W-CONM-17 I've used a few of these guys recently - Blackmagic's quad HD/SDi input to HDMI 2.0 output for taking the UHD / 4k (either tile or 2SI standard) and making something that will display on a 4k domestic TV. They seem to work quite well, but here are a few things that I had [...]
A review of Colour Reproduction in Electronic Imaging Systems: Photography, Television, Cinematography by Michael S. Tooms
All of my colourimetry comes from doing it; my theoretical knowledge isn't that great as I didn't study it at university and the colour training at the Beeb, although entirely appropriate to what a TV engineer needs was just that; TV-centric. Over the last ten years I would credit the following industry colleagues for widening [...]
Starting with the fundamentals of cryptography (difference between symmetric & public-key etc), Phil goes over the encryption techniques used in the Enigma machine (with a genuine, working example) through to HDCP and the other forms of content protection used in our industry: Symmetric vs Public-key crypto Examples – DES, AES/Rijndael etc HDCP, Blueray and the [...]
We've got BVE2016 coming up and one of the things root6 will be showing is an HDR workflow via Media Composer using Canon monitors. HDR is still a bit of a crap-shoot as far as standardisation is concerned with the BBC/NHK system, Dolby Vision, Sony's SLog3 and Canon's camera-native CLog. The principle of using an [...]
My podcast-partner in crime, the mighty Hugh Waters asked me how often I run audio signals over twisted-pair data cable in media facility builds. Has has a customer who is eager to do it this way. I’ve done it a few times and it’s fine with a few considerations. Earthing is still important and since [...]
Barnfind are one of the products I'm responsible for at Root6 and I love them for their forward looking attitude and the fact they embrace open standards; if you see an SFP hole or a BNC connector you know that it will work with any other manufacturers (unlike Evertz who re-define the standard and put [...]
I've recently been upgrading Boland BVB25 OLED monitors over their RS232 serial ports; aside from needing a USB/serial adaptor (I use the Keyspan which mimics an old PC serial UART) you also need a null-modem cable (i.e. where Tx and Rx are swapped over). You can tell if a null-modem cable is required by the [...]
In the last year or so a lot of my time seems to have been taken up with getting monitors and other display devices to show the correct colours for film and TV. However, as with all other areas, context is everything and the colour of the wall behind the monitor (and the colour of [...]
I’ve had to dig into signal transport for 4k/UHD over the last week or so. Essentially I have a test-signal generator (SRI Visualizer TG100) running at a maximum raster of 4096×2160 at a maximum of 25 progressive frames/sec (and only 4:2:2 colour sampling; Y, Cr, Cb) with a 6G single-link output (so really 4 x [...]
I had an excellent half day with Canon’s UK imaging display guys to look at their DP-V series 4k native displays. To my shame I had assumed that they would be like the HP Dreamcolor or Eizo ColorEdge series monitors which are advertised as being suitable for film and TV work but as I’ve often [...]
The most interesting things I saw at IBC last week were not software updates or new 4k workflow tools (save us from "workflow tools"!) but some developments from our good friends at Barnfind. Their current CWDM products top-out at 18-wavelengths on a single fibre, and if you need to pack more signals (synchronous broadcast; HD/SDi, [...]
I spent the morning in a very typical Soho edit room with a JVC DT-V24-series LED-backlit LCD as the "front of house" monitor and an LG LED-backlit LCD as the client display. It's quite easy to get the JVC looking right - BBC style 6504k for Rec.709; I've waffled on about this a lot in [...]
This morning I did a presentation for the root6 Tech Breakfast series entitled “Colourimetry, Calibration and Monitoring” - You can grab my notes here This is all to promote the new US manufacturer we've taken on; for my money their BVB25-OL ED monitor is the best TV display for under £10k.
I've banged on about Amulet a lot in the past - it really is the best KVM-over-IP implementation of Teradici there is. One of the reasons for this is their external DXiP cards and rack system that allows you all the benefits of Teradici without having to stick in a PCI-e card (either for reasons [...]
I recently bought an Agilent U1191A clamp-meter. This is a piece of test equipment that can measure current flowing in a conductor without having to break the circuit (how you would if all you had was a digital multimeter). The jaws physically couple around the conductor in question and by induction you can measure the [...]
It's actually a rhetorical question and I'm glad they do. Most of the time I have to tell a customers' electrician and air-con contractor how much power (and hence how much heat) the machine room will be pulling/genarating. Most customers refuse to believe that 99.9% of the electrical power entering a server room/TV MCR leaves [...]
Broadcast Film & Video have done a couple of articles on Root6's SI offerings; Our thoughts on broadcast and post systems integration as a PDF here What it means to be a "value-added systems integrator"
Recent years have seen many prosumer camcorders with HDMI outputs so that you can get access to the uncompressed RGB sensor output rather than having to make do with the H.264 (typically) encoded Y, Cb, Cr data (from the flash or disk-based recorder). […]
Just about the only things that caught my eye at the recent Beyond HD Masters day at Bafta was Sony's IP Live system. This is a single product called the NXL-IP55 which puts four 1080i 4:2:2 signals over a gigabit connection - so modest 6:1 compression with a well-defined single field of latency. The camera [...]
I've been calibrating TV displays for around twenty-five years and have always leaned on the BBC practice of setting peak white at 80Cd/m2 and the white point at 6504k. For all the decades of standard definition work a gamma of 2.2 has been used. This is required because television cameras don't have a linear transfer [...]
Compression is a fact of life, there have only been two production VTRs that stored uncompressed video – D1 and D5; they are no longer used because they were both SD (and D1 was only eight-bit video). So, the vast majority of the material we handle is compressed and so there should be a way [...]
As I get more familiar with Barnfind’s products I need to make a note of some of their gotchas! […]
Root6’s SI dept spent a few days last week in Norway as the guest of Barnfind in Sandefjord. Norway seems to be a lovely country if not a tad expensive (£24 for a round of three pints). Barnfind are a small company whose engineers used to be with Nevion – you’ve probably come across their [...]
I've been running training at the MET's video forensics lab soon and part of it is explaining how DCT-based compression works and particularly the effects of corruption on long-GOP MPEG transport streams as delivered in DVB-MUXes. One of the illustration videos is below. Three clips; each with a momentary corruption to the data stream and [...]
Last week I went on a very interesting training day courtesy of Nexans – data cable & parts supplier. I went looking forward to learning all about the new standards surrounding catagory-8 cabling for 40 and 56 Gigabit ethernet (a massive 1600Mhz of bandwidth down a twisted pair cable!) and the new GG45 connector; [...]
Engineers have sought to quantify the quality of the video signal since the birth of television. Since all aspects of the TV picture are represented first by voltages (analogue) and then by numbers-in-a-bit-stream (digital) you have to make measurements to really know anything about the quality of your TV pictures. “When you can measure what [...]
Here's a brilliant document from Tek - tell you all you need to know about eye pattern, jitter etc. http://www.tek.com/document/how-guide/sdi-eye-and-jitter-measurements...
If you need to control a deck (or test routes through an RS422 matrix) then a very quick and easy way of doing it is via your laptop. Modern machines don’t have RS232 ports and so you can’t just hook up an RS232-422 balancer, but USB serial devices are cheap – the Addenda RS-USB4 is [...]
I have a pair of new PVM-A250s in ahead of an install and wanted to test a couple of things out. My first one was to see if the monitor does the right things between it's studio swing-range HD/SDi 4:2:2 input and it's full-range HDMI 4:4:4 inputs. Aside from a slight shift in luma (big [...]
Every TV industry magazine is currently honor-bound to run a “video-over-IP will replace baseband this year” article at least once every three months. Despite the attraction of sending video over networks there are fundamental problems related not to the fact that it’s a network (but, then again TCP/IP was never meant for synchronous, timely delivery [...]