QUOTE(linkinstreet @ Oct 1 2019, 02:21 PM)
technically it was okay when we are all using CRT + RCA connections. But nowadays as we move on to HD, Astro thought it's a good idea to keep the old output spec in the name of "compatibility". To makes matters worse, every SD channel is 4:3, no matter what the source aspect ratio is, and if the source is 16:9, they "helpfully" added black bars as well, making the picture which is already in a lower resolution much smaller than it really is.
Astro has removed the letterbox on almost all of its SD channels for quite some time already. The SD channels itself is technically still in 4:3, but they make it fit to screen so that letterbox won't be shown. And yes, Astro still uses MPEG2 4:3 for its SD channels so that legacy Astro boxes can still be used, which supports only the older DVB-S standard and MPEG2 video codec. Previously there are complaints from some legacy STB users whereby if the SD channel video itself is in native 16:9 aspect ratio, it will display only a black screen and audio only. Presumably is due to compatibility issue on the legacy boxes as it "doesn't recognise" or "don't support" 16:9 video. So they got to transmit it in 4:3 from their side, but remove the letterbox so that no black bars will be shown.
Meanwhile, there are still a handful SD channels on Astro that still did not remove the letterbox, such as TVB Entertainment (ch313), all Astro AOD (SD) channels, Asian Action Channel (ch327) and TVB Classic Movies (ch328), CNN (ch511), and others.
However, all Astro AOD (SD) channels, Asian Action Channel (ch327) and TVB Classic Movies (ch328) are found to be the only SD channels on Astro that uses MPEG4 video codec with HE-AAC audio codec. These channels does not appear on the channel list for legacy Astro boxes.
Oct 1 2019, 02:48 PM

Quote














0.0349sec
0.25
7 queries
GZIP Disabled