[mythtv] [mythtv-commits] Ticket #5351: Internal player can't downmix 5.1 AAC properly

Robert McNamara robert.mcnamara at gmail.com
Thu Sep 2 04:47:45 UTC 2010


On Wed, Sep 1, 2010 at 9:42 PM, Steven Ellis <steven at openmedia.co.nz> wrote:
>
> On Sun, August 15, 2010 2:12 am, Stuart Morgan wrote:
>> On Saturday 14 Aug 2010 15:00:40 Raymond Wagner wrote:
>>>   On 8/14/2010 05:22, MythTV wrote:
>>> >   I have the same problem as specified in the original ticket. I
>>> couldn't
>>> >   work out why some Blu Ray rips were not playing back correctly and
>>> >   others were. The only difference is 5.1 downmixing. I am using
>>> >   0.23+fixes on the Mythbuntu distribution. I'm not sure what extra
>>> >   information is required to help troubleshoot this issue.
>>>
>>> It's a known issue with 5.1 AAC playback. We use an external decoder for
>>> AAC playback, instead of the normal ffmpeg libraries, as it's needed for
>>> LATM support used by some broadcasters. One of the devs is working on
>>> support to submit upstream to ffmpeg, which will hopefully get back to
>>> MythTV some time in the 0.25 cycle.
>>
>> Alternatively you can compile without that external lib (libfaad) and use
>> the
>> build in aac decoding, just keeping in mind that LATM isn't supported.
>
> The lack of LATM is going to break things for broadcast TV here in NZ.
> They use HE-AACv2 with LATM for the audio on most of their terrestrial
> channels.
>
> Steve
>

Then users in NZ should not use trunk in production.  Just because
it's not there now doesn't mean we don't intend to have LATM support
tehre for .24.

Robert


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