Podcast sample rate

RS richard22j at zoho.com
Thu Jul 27 08:20:02 PDT 2017

>From: Jim web
>Sent: Wednesday, July 26, 2017 13:12

>WRT TV I think the Proms files I've fetched are all 320k audio now. But
>I've not checked in detail what I've got thus far. My personal regret here
>is that I'd prefer the 25fps video with 320k audio, but have to go for
>50fps to get it.

I think you're right about 320kbit/s audio only being with the 50fps modes. 
25fps HVFxsd only has 96kbit/s HE-AAC v1 with SBR.  HLShd has 96kbit/s 
AAC-LC.  I guess it would not be too difficult to take the video stream from 
HLShd and multiplex it with the audio stream from HVFsd.  On the .ts files 
Mediainfo shows the audio delay.  On one I looked at it was only 20ms or 
half a frame, which is not worth worrying about.

For the first time I downloaded HVFsd to get the 320kbit/s audio and played 
it back in VLC on this machine.  The picture quality was atrocious.  Bernard 
Haitink moved fairly smoothly but panning over the orchestra was very jerky 
at about 5fps.  HVFhd was even worse.  The screen went grey from time to 
time with interruptions to the audio.  This is an elderly machine with a 
2.33GHz Core 2 Duo and 4GByte of RAM.  I do have faster laptops with 8GByte 
of RAM.  I'll have to see what happens on them.   I also have a netbook with 
a 1.66GHz Atom which struggles with 832x460 25fps.  I wonder if the BBC took 
it into account when it decided Video Factory would standardise on 960x540 
50fps.  Fortunately my satellite receiver plays the files.

>FWIW I've not fetched any 320k radio files of Proms yet this year. Too
>busy with the flac! :-)

I'll have to look back at your notes on how to get FLAC.

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