I could be wrong, but I seem to remember asking an almost similar
question when I first started with Rivendell.
It is my understanding that you do not need ASI cards to play either mp3
or mp3 cards. You might have needed them 'back in the day', but these
days I believe ASI cards only gets you the following features:
Time Scaled Audio.
Hardware MPEG encode/decode.
Thats about it. Hardware encode/decode shouldn't be an issue-todays
processors are more than capable of doing the job in realtime with
plenty of 'horsepower' left to spare. Now it *might* be the hardware
encode/decoding produces better quality results, I'm not sure though. I
know in the video side of things hardware decoding/encoding>software.
May not apply to audio though???
-Alan
On 2/27/2020 6:02 PM, drew Roberts wrote:
Well, I have been thinking further and trying to remember...
On Thu, Feb 27, 2020 at 6:10 PM Timothy Elwell
<telw...@pilotproductions.net <mailto:telw...@pilotproductions.net>>
wrote:
Hi Frank,
ASI cards should only required for MP3. MP2's patent expired a
number of
years ago and was added to Rivendell as soon as the patent
expired. MP2
should be usable on any recent RD system (I don't remember the exact
version it was added, but I know it's worked well for me on v2+).
For the format it stored in, as I understand it, the MP2 is stored
in a
wav container, not as a wav format. I haven't tried it with a Pi yet,
but have been working on that build to try MP2 on the Pi for a
specific
use case I have.
IIRC, we had it running on a Pi and the files were stored as MP2.wav
It has been a long time since that machine was powered up though so I
may have mis-remembered something. Still worth a quick experiment on
that Pi.
Others are more informative than I am, I know. But hopefully this
will
help you a little.
all the best,
drew
Tim
On 2/27/20 4:43 PM, Frank Christel wrote:
> Noob question: why are ASI cards required to play MP2 files?
>
> From the “Features and Benefits” list on the Rivendell home
page: "Support for both PCM16 and MPEG Layer 2 audio formats (MPEG
Layer 2 support requires the use of select sound cards available
from AudioScience Inc.).”
>
> (ASI cards are required by BSI’s Simian to play MP2s on Windows,
too.)
>
> Is the MP2 format so old there are no software decoders? Or is
MP2 processing so intensive in real time that it must be offloaded
to an external sound card?
>
> Is there a way for a RasPi Rivendale node to play MP2s without
first converting the files to WAV?
>
> Frank Christel
>
> ______________
>
> On 2/26/2020, at 5:49 PM, Fred Gleason <fr...@paravelsystems.com
<mailto:fr...@paravelsystems.com>> wrote:
>
> ...Not all ASI cards are supported in any given driver version.
For CentOS 7 setups, we provide three, v4.13.0, v4.20.10 and
4.20.21 (with v4.20.21 being installed by default). Any ASI-5XXX
or ASI-6XXX card (the ones with the orange colored mu-metal
shields) should be able to work with one of those drivers,
although sometimes some experimentation is required to find out
which driver does the trick… That said, ASI-4XXX cards (the ones
with the blue mu-metal shields) are NOT supported in Rivendell at all.
>
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