QUOTE(westlife @ Apr 25 2017, 10:12 PM)
in the past it is used to be ok one. the same drama broadcasted few years in full screen, while now broadcasted in letterbox.
i could only explain this that they do it for those 4k tv? because if show on full screen will be stretched so there will be too much distortion?
No... Nothing gonna do with 4K TV. No need to think until that far.
It's all about aspect ratio and video quality. Initially the channel is in SD 4:3 but now the channel provider provides the channel in HD 16:9. But Astro still offer the same channels in 4:3 without stretching/remove letterbox, so letterbox will appear at all times in order for 16:9 content to display correctly on 4:3 TV. But it won't look good for 16:9 TVs as viewers will see stretched image+letterbox.
Things become worse when the channel is airing a 4:3 programme in 16:9 HD channel. Pillarbox will be added from channel provider + unnecessary letterbox added from Astro = windowboxed (black bars on top, bottom, left and right sides).
Astro has this hidden agenda to display letterbox for 16:9 content on 4:3 channel is for the sake of marketing of HD service. If Astro transmit the channel in native 16:9 aspect ratio, majority of the customers won't be able to see the difference between SD and HD, making HD service (RM26.50/month) no longer a good selling point, and no longer something that is easier to persuade customers to subscribe to.
You can try compare it yourself with Astro Arena channel. Astro Arena is one of the native 16:9 SD channels on Astro. Make sure you're watching from HDMI. Ask yourself, how BIG is the difference you see between CH802 (SD) and ch802 (HD)? Now you know why Astro is reluctant to display all of its SD channels in natove 16:9? Astro only handpicked several SD channels to be in native 16:9 (NHK World, Bloomberg, Disney Channel, Disney Junior, Disney XD, Astro Arena, Eurosport, FYI) and nobody knows what's the reason behind it.
When it shows letterbox, you will see the difference and having the tendency to subscribe to HD service because of its pictures quality differences. And eventually, Astro earn money.