Audio/Video Out of Sync

[RS]

>From: RS Sent: Sunday, August 14, 2016 22:53

>If we had a 25fps equivalent of HVFHD we wouldn't need HLSHD or FlashHD. 
>There are two modes at 960x540.  HVFSD is 50fps and HVFvhigh is 25fps.  A 
>mode at 1280x720 25fps is the obvious step down from HVFHD, but it isn't 
>there.  It's strange since a lot of content doesn't need to be 50fps.

I've just found some articles by someone called Christopher Woods entitled 
How good is HD supposed to be.  There is a link to
http://www.bbc.co.uk/rd/blog/2015-07-the-development-of-new-video-factory-profiles-for-bbc-iplayer
which gives some information on the Video Factory project.
"At around 3 Mbit/s a 960x540 profile at 50fps will be made available to 
Connected TVs and set top boxes. The Elemental encoders are used to convert 
the 1920x1080 interlaced content to 960x540 for progressive encoding at 
50fps. Although the 960x540 profile has a reduced spatial resolution 
compared to the outgoing 1280x720 at 25fps, subjective assessments shows it 
delivers significantly better pictures on TV screens across a wide range of 
popular content (such as EastEnders and Top Gear) due to its higher frame 
rate. The 50fps, 1280x720 profile, however, will be available to those with 
5Mbit/s broadband connections."

There is also a link to a blog.