[FFmpeg-devel] [PATCH] aacenc: WIP support for PCEs

pkv.stream pkv.stream at gmail.com
Wed Nov 15 00:38:27 EET 2017


Le 14/11/2017 à 11:14 PM, Carl Eugen Hoyos a écrit :
> 2017-11-14 21:01 GMT+01:00 pkv.stream <pkv.stream at gmail.com>:
>> Le 14/11/2017 à 1:20 AM, Carl Eugen Hoyos a écrit :
>>> 2017-11-09 9:01 GMT+01:00 pkv.stream <pkv.stream at gmail.com>:
>>>
>>>> 1) there are changes to make to the list of channel layouts not requiring
>>>> PCE
>>>>
>>>> ==> AV_CH_LAYOUT_5POINT0 to AV_CH_LAYOUT_5POINT0_BACK
>>>> since the previous is
>>>> 5.0(side) while the latter is 5.0 which is what is in spec (table 1.19
>>>> ISO/IEC 14496-3:200X(E) or table 42 ISO/IEC 13818-7:2004(E) )
>>>>
>>>> see patch in attachment (can't be applied directly due to rebasing issues
>>>> from your initial patch)
>>> Did you test what effect this patch has on ffmpeg (the command line
>>> interface)
>>> when encoding five- or six-channel aac from back and side source?
>> yes I did check, this patch reverts aac encoder to previous behaviour with
>> 5.0 and 5.1 (when there was no PCE)

more accurately: 5.0 5.1 back is reverted to previous behaviour  , but 
5.0 5.1 side is not because it uses now PCE, which agrees with spec (no 
weird channel rematrixing though); sorry for the inaccuracy.

> Thank you for the explanation!
>
> Carl Eugen
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