Capturing a slice of the 3D market


The capture card is an essential bit of hardware glue that connects the professional TV studio world to the IT world of the modern high-performance PC.A bewildering range of models and options are offered. Some features are poorly specified or not even mentioned in the product specs. Where there is analogue to digital conversion going on, you really want to know if it is linear, monotonic and with no missing codes, plus the signal to noise ratio. More importantly in today's HD-SDI-centric world, what the return loss is on the BNC sockets. Very few cards actually even have the input and output sockets labelled or colour-coded. This can make connection something of a nightmare where cards can sport two, three, four, five or even eight sockets.
Many facilities have to cope with frequent changes in video format and frame rate. At least one major manufacturer’s cards and devices give no indication of the input format if it is incorrectly set and has no automatic set-up when it changes; others do. Another poorly specified feature is duplex operation. Many cards have both inputs and outputs present. Not all models support simultaneous use (duplex) of these facilities.
If you are running applications under Windows, there is an underlying plug-and-play framework for video interconnectivity called DirectShow provided (free) by Microsoft. Where an application uses DirectShow it means that a ‘card’ with a DirectShow driver provided by its manufacturers will usually automatically just work. Sadly some applications do not use this method and therefore have to be specifically tailored to interface to a particular card. This is why some apps do not support all possible makes and types card.
Personal experience has shown that many manufacturers do not always properly support the DirectShow interface with the card-specific driver they supply. This is particularly true in 3D where at least two major makers offer cards supposedly for 3D that do not currently work for dual stream operation or have other deficiencies. The way round this is to write card-specific front-end software to make each model work correctly.
The Cel-Scope3D stereoscopic analyser application uses DirectShow and so interfaces to most appropriate models of capture card. For those cards that lack a lot of the bells & whistles, it has a card-specific front end interfaces giving the widest possible user choice.


Tags: iss059 | 3d capture card | directshow | N/A
Contributing Author N/A

Read this article in the tv-bay digital magazine
Article Copyright tv-bay limited. All trademarks recognised.
Reproduction of the content strictly prohibited without written consent.

Articles
Protecting the continuity of transmission
Lorna Garrett Your viewers love you. You consistently bring them their preferred channels 24/7. They’ve come to rely on you for their viewing pleasure. They never miss cheering on their beloved sports teams. They’re the envy of their friends as they watch live concerts of their favourite bands. They gather the family around and catch up on their must-see shows. They don’t have a bad word to say about you.
Tags: iss134 | garland | gpl | streaming | artel | disaster recovery | Lorna Garrett
Contributing Author Lorna Garrett Click to read or download PDF
Accelerated Workflows with eGPU
Mike Griggs From the UK’s National Trust to magazine publishers to manufacturers, digital content creator Mike Griggs has a wide and varied portfolio of clients for whom he creates 3D art, motion graphics and multimedia exhibits. A typical day might involve sampling birdsong near Virginia Woolf’s country estate or creating 3D animations for VR. To keep on top of these demands, Griggs wanted to take the full power of the GPU computing revolution on the road.
Tags: iss134 | sonnet | egpu | amd | post production | editing | Mike Griggs
Contributing Author Mike Griggs Click to read or download PDF
State of the Nation - November 2018
Dick Hobbs - new There is an interesting seminar called Size Matters at the KitPlus Show – organised by the publishers of this fine magazine – at MediaCityUK in Salford on 6 November. It’s a talk by cinematographer Alistair Chapman on the way that camera technology is changing, and in particular the size of the electronic device which creates the image is growing.
Tags: iss134 | cmos | 35mm | AJA | Arri | Blackmagic | Canon | Datavideo | GoPro | Grass Valley | Hitachi | Ikegami | JVC | Kinefinity | Nikon | Panasonic | Red | Sony | jpeg2000 | Dick Hobbs - new
Contributing Author Dick Hobbs - new Click to read or download PDF
Giving Welsh sport a global audience
Adam Amor From the Ospreys Rugby Union team, to the Football Association of Wales, as well as national cycling, swimming and boxing coverage, Port Talbot based Buffoon Film and Media has been heavily involved in putting Welsh sports on the world stage.
Tags: iss134 | blackmagic | atem | buffoon | micro studio camera | Adam Amor
Contributing Author Adam Amor Click to read or download PDF
University and Mental Health
Rhiannon Jenkins University study and mental health has been in the media quite a bit over the last year, and I’m sure there are many people wondering what is going on? The issues are complex, and I suppose the focus of employability off the back of a degree course has raised the stress stakes for a lot of young people. I’m only qualified to talk about this from my perspective, and my story began when I joined a course not knowing I had a mental health condition.
Tags: iss134 | portsmouth uni | mental health | student | tvfutures | Rhiannon Jenkins
Contributing Author Rhiannon Jenkins Click to read or download PDF