[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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