[FFmpeg-trac] #6974(undetermined:open): Improve handling of AAC PCE audio channels with segmented MPEG-TS

FFmpeg trac at avcodec.org
Thu Oct 25 19:53:42 EEST 2018


#6974: Improve handling of AAC PCE audio channels with segmented MPEG-TS
-------------------------------------+-------------------------------------
             Reporter:  redmcg       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:
              Version:  git-master   |  undetermined
             Keywords:  aac          |               Resolution:
  regression                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by pkv):

 * status:  new => open


Comment:

 Table 42 of ISO/IEC 13818-7:2004(E) (default channel mappings) has indeed
 for 6 channels:

 center front speaker
 left, right front speakers,
 left surround, right surround rear speakers,
 front low frequency effects speaker

 This is AV_CH_LAYOUT_5POINT1_BACK = "5.1" and not AV_CH_LAYOUT_5POINT1 =
 "5.1(side)" (see channel_layout.c, channel_layout_map[] ).
 A workaround to avoid PCE being invoked for a 5.1(side) source is to add
 the option channel_layout='5.1' on the source. This is similar to what
 redmcg mentions.

 So commit fc9dcfe7d50d7f1b38fb287b4d92b5f3fc4bfb05 is in line with spec.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6974#comment:6>
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