[FFmpeg-trac] #5804(avfilter:open): pan audio filter parser fails to correctly parse LFE2 channel identifier

[FFmpeg]

#5804: pan audio filter parser fails to correctly parse LFE2 channel identifier
------------------------------------+------------------------------------
             Reporter:  codyopel    |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:  pan         |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
------------------------------------+------------------------------------
Changes (by cehoyos):

 * status:  new => open
 * reproduced:  0 => 1


Comment:

 For future tickets, please remember to test current FFmpeg git head when
 reporting an issue.
 {{{
 $ ffmpeg -channel_layout LFE2 -f lavfi -i sine=d=1 -af "pan=1c|c0=LFE2" -f
 null -
 ffmpeg version N-81473-gb2c6a11 Copyright (c) 2000-2016 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      55. 29.100 / 55. 29.100
   libavcodec     57. 54.100 / 57. 54.100
   libavformat    57. 48.100 / 57. 48.100
   libavdevice    57.  0.102 / 57.  0.102
   libavfilter     6. 57.100 /  6. 57.100
   libswscale      4.  1.100 /  4.  1.100
   libswresample   2.  1.100 /  2.  1.100
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, lavfi, from 'sine=d=1':
   Duration: N/A, start: 0.000000, bitrate: 705 kb/s
     Stream #0:0: Audio: pcm_s16le, 44100 Hz, 1 channels (LFE2), s16, 705
 kb/s
 [Parsed_pan_0 @ 0x28b2a40] Syntax error near "2"
 [AVFilterGraph @ 0x28b1b20] Error initializing filter 'pan' with args
 '1c|c0=LFE2'
 Error opening filters!
 }}}
 The following does not show an error:
 {{{
 $ ffmpeg -channel_layout LFE2 -f lavfi -i sine=d=1 -af "pan=LFE2" -f null
 -
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5804#comment:1>
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