Smart_Photography_-_September_2019

complicated. First there is a video stream

carrying motion pictures plus you have

audio.

To properly display both together with

proper synchronisation, they need to

be packaged together. Plus, you need to

convey metadata, subtitles, etc.

All these components are put together in

what is called a ‘container’. This is

the final usable output, which is in the

form of a file that you can see on your TV.

There are many types of containers

and each supports only certain types of

video and audio codecs. Which container

supports which codecs is beyond

the scope of this article. The popular

containers (with file format extensions

in brackets) are MPEG-4 Part 14

(MP4), Windows Media Video (WMV),

QuickTime (MOV), Matroska (MKV), etc.

The output from your ILC is the

container file that has both the video and

audio streams. It is important to note

that all formats will not be supported

by most ILCs. If you want to record

only in a particular format, then make

sure your ILC supports that, though file

conversions can be done later.

Next month: Well readers, there is a lot

more! Next month you will read about

Chroma Sampling, Time codes, effect of

shutter speed, rolling shutters, cine lenses,

and some important video accessories. So,

stay tuned! |SP

* All text, diagrams and images © Ashok Kandimalla.

Picture 4: A sample image without Log function Picture 5: The same image with Log function. Note the low overall contrast.

However, this is ideal for grading as all the highlight and shadow details are present.

96 | Smart Photography | September 2019 http://www.smartphotography.in

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