The change in storage space needed for recordings on VM
I accidentally recorded All Aboard! The Great Reindeer Migration from BBC4 HD again the other day, and it occurred to me to check how much space they both took, I was curious.
5.41GB - was recorded on 24th December 2018 back when BBC4 HD was on 163 2.3GB - was recorded on 12th December this year. I'm assuming most of this difference is the switch from MPEG2 to MPEG4. I was expecting the newest recording to be around 3GB, so the difference was much better. Thought it might briefly interest others who have VM TV how much has changed behind the scenes, and yet how little they may have noticed. |
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I'm currently watching live stream of my local football team so I can't look it up to be more precise with my words for these instructions. |
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I had a feeling new encoders were a part of it, I recall them being mentioned recently but have no idea how long they've been installed. I couldn't remember when the HD channels switched to MPEG4 so wasn't sure what to attribute to the change. How much bigger were the MPEG2 HD channels on VM just before they were superceded? It's impressive the results, I couldn't really see any difference when I compared scenes. |
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The new encoders have been gradually introduced since October. The switch to MPEG4 halved the bit-rate, and now it's being halved again.
And if you think that's impressive, see the bit-rates that Netflix are dabbling with: https://netflixtechblog.com/optimize...g-47b516b10bbb |
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A quick skim on Digitalbitrate has the current MPEG4 HD channels varying anything between 2 and 7 MB/sec as this depends how many channels are being squeezed in and what prioritisation they are given. Digitalbitrate is currently reporting BBC 4 HD averaging 1.8. You are probably comparing when the number of HD channels was capped at about 6 per transport stream (a straight average of 7.5 MB/sec once overheads taken out, with BBC4 a lower priority compared to other content on the stream). |
Re: The change in storage space needed for recordings on VM
Quite possible jfman.
Wow. That's impressive spiderplant. Even Freeview might be able to achieve some previously unthought of things on its HD mulitplexes if those examples are anything to go by. |
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Only impressive if the picture quality has not suffered. You have an ideal opportunity to gauge this by watching both recordings. |
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As I type this I'm currently watching (well, it's on in the background) one of the lower resolution SD Freeview channels in the kitchen 24 inch (circa 2010) TV and it's acceptable. The screen in question has Full HD resolution (via other input sources) but no HD tuner, so I'm not sure how much upscaling it's doing, but it's 10 years old tech (at least). |
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A good test was always the Olympic swimming and rafting events. Water kills compression algorithms for fun.
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