Re: AAC-HD, Flash AAC

Hi Greg,

re flv
What is the build target and output plugin name ?

Our current helix base version is -
HELIX_DATESTAMP="-D 20070820"
build -m hxclient_1_5_0_cayenne_restricted -P 
helix-client-audio-all-fixpt -h -trelease -tsymbols $HELIX_DATESTAMP splay

If we got the flv plugin from Atlas and plugged it into our cayenne 
build, what are the chances of that working ? ie is it just a new plugin 
or were there changes to the core needed in order to support FLV ?


re AAC-HD
Yes, I saw that the content should be able to be played back (at reduced 
quality) via existing AAC decoder. Haven't tried that yet.

The customer is interested in the -HD part (24 bit 96khz playback). I'm 
presuming this is not on your roadmap ?

John


Gregory Wright wrote:
>
> On Jul 16, 2009, at 6:56 AM, John Stirling wrote:
>
>> Hi Eric,
>>
>> Sorry, getting pushed by our marketing people for an answer on this..
>>
>> Just need confirmation of -
>> (re flv)
>> What branch is that supported on ?
>> Also, I presume once we have the appropriate .flv plugin then other 
>> datatypes via .flv (eg mp3) will also be supported ?
>
> It is on HEAD and 310Atlas for sure. I also believe it was used on 
> some Cayenne
> branches, but I was not part of that work so I am not sure.
>
> Did you need an answer on a particular branch?
>
> I would guess MP3 is supported, but someone more involved in FLV playback
> would have to say for sure.
>
>
>>
>> (re AAC-HD)
>> Are there any plans to support it ?
>
> "The HD-AAC encoding process embeds a core layer that can be played on 
> existing music players and mobile phones that support the standard AAC 
> format, such as Apple's iPod and the iPhone. The fully lossless signal 
> will be available for playback in future devices that feature an 
> HD-AAC decoder, according to the company. HD-AAC files can also be 
> streamed to multiple devices at varying bitrates to help maximize the 
> sound quality under varying network conditions."
>
>
> It sounds like AAC-HD will playback fine via current AAC decoders. So 
> they say
> anyway. If the file formats/mime-types are the same and the bitestream 
> really
> is compatible with normal AAC, the it "should just work(tm)".
>
> --greg.
>
>
>
>>
>> Thanks
>> John
>>
>>
>> John Stirling wrote:
>>> Eric Hyche wrote:
>>>> John,
>>>>
>>>> I'm not familiar with the term "AAC-HD". Is there a 
>>>> specification/definition for it somewhere?
>>>>
>>>>
>>> Some links below
>>>
>>> http://www.iis.fraunhofer.de/EN/pr/Presse/Press_Releases_2008/HD-AAC_by_Fraunhofer_IIS.jsp 
>>>
>>>
>>> http://www.macworld.com/article/131447/2008/01/hdaac.html
>>>
>>>> As far as Flash AAC, I assume you mean AAC within a .flv or .f4v 
>>>> file. If so, then yes, this is supported.
>>>>
>>>>
>>> Yes, .flv.
>>>
>>> What branch is that supported on ?
>>>
>>> Also, I presume once we have the appropriate .flv plugin then other 
>>> datatypes via .flv (eg mp3) will also be supported ?
>>>> Eric
>>>>
>>>> =======================================
>>>> Eric Hyche (
>>>> [email protected]
>>>> )
>>>> Principal Engineer
>>>> RealNetworks, Inc.
>>>>
>>>>
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From:
>>>>> [email protected] 
>>>>> [mailto:[email protected]
>>>>> ]
>>>>> On Behalf Of John Stirling
>>>>> Sent: Monday, July 13, 2009 3:37 AM
>>>>> To: Helix client dev
>>>>> Subject: [Helix-client-dev] AAC-HD, Flash AAC
>>>>>
>>>>> Are either of these formats currently supported by helix ?
>>>>>
>>>>> If so -
>>>>> . what branch are they available on.
>>>>> . what are the approx MIPs requirements for AAC-HD
>>>>>
>>>>> If not -
>>>>> . are there any plans to add support and what are the timescales.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
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>>>
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>>>
>>>
>>>
>>
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>