Podcast sample rate
richard22j at zoho.com
Wed Jul 19 08:41:11 PDT 2017
>Sent: Wednesday, July 19, 2017 14:13 I wrote
>The answer seems to be that some programmes do use SBR and some don't.
>Recent studio and outside broadcast programmes seem to use AAC-LC so there
>is no SBR and the 48kHz sampling rate is preserved, although at least some
>of the Wimbledon coverage had SBR. A few weeks ago there was a repeat of a
>Talking Pictures programme on Lord Olivier and that had SBR. When older
>films are made available on the iPlayer some use AAC-LC and some have SBR.
The programmes which I identified as using SBR were probably downloaded
using hvfxsd5. I have downloaded some of the programmes which I had
previously downloaded with hlshd1 and found to use AAC-LC. This time I used
hvfxsd5 and the programmes did have SBR.
As far as I can see at present the rule is
hlshd1 96kbit/s AAC-LC and 48kHz sampling rate
hvfxsd5 96kbit/s HE-AAC v1 with SBR and 24kHz sampling rate for players
which do not support SBR
One exception I have seen is the red button coverage (not the highlights) of
the Olympics which I downloaded with hvfxsd or its HVF equivalent at the
time, but that may have been from a different CDN. I have not tested
widely, and I have not tested other modes or CDNs other than Akamai.
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