[FFmpeg-devel] [PATCH] Add a new channel layout API

[Paul B Mahol]

On 12/30/18, Nicolas George <george at nsup.org> wrote:
> Paul B Mahol (2018-12-30):
>> >> Input #0, wv, from
>> >> '/home/computer/Downloads/Run_The_Race_-_3rd_Order_Ambisonic_SN3D.wv':
>> >>   Duration: 00:11:07.67, start: 0.000000, bitrate: 6084 kb/s
>> >>     Stream #0:0: Audio: wavpack, 44100 Hz, 16 channels
>> >> (FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL), s16p
>> >
>> > Yes... and...?
>>
>> From this is obvious that user can not use '+' to separate channel
>> layouts if it is already used to define channel layouts.
>>
>> Do you need better explanation now?
>
> Well, quoting the original patch:
>
> + * The input string can be represented by:
> + *  - the formal channel layout name (returned by
> av_channel_layout_describe())
> + *  - single or multiple channel names (returned by av_channel_name()
> + *    or concatenated with "|")
> + *  - a hexadecimal value of a channel layout (eg. "0x4")
> + *  - the number of channels with default layout (eg. "5")
> + *  - the number of unordered channels (eg. "4 channels")
>
> There is no mention about '+'. So I guess this paragraph needs to be
> rewritten to actually match what is being done.
>
> And if + is not possible, | is still a bad choice. Use a character that
> is not special for standard shells, I am sure we can find some; maybe /.
>

Please no, | is used in bunch of scripts.