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ad_lavc: disable AC3 DRC by default

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This commit is contained in:
wm4
2015-03-30 19:44:52 +02:00
parent 8fff125422
commit ebef5da074
2 changed files with 7 additions and 4 deletions
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7
DOCS/man/options.rst
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@@ -917,11 +917,14 @@ Audio
``--ad-lavc-ac3drc=<level>``
Select the Dynamic Range Compression level for AC-3 audio streams.
``<level>`` is a float value ranging from 0 to 1, where 0 means no
compression and 1 (which is the default) means full compression (make loud
passages more silent and vice versa). Values up to 2 are also accepted, but
compression (which is the default) and 1 means full compression (make loud
passages more silent and vice versa). Values up to 6 are also accepted, but
are purely experimental. This option only shows an effect if the AC-3 stream
contains the required range compression information.
The standard mandates that DRC is enabled by default, but mpv (and some
other players) ignore this for the sake of better audio quality.
``--ad-lavc-downmix=<yes|no>``
Whether to request audio channel downmixing from the decoder (default: yes).
Some decoders, like AC-3, AAC and DTS, can remix audio on decoding. The

4
audio/decode/ad_lavc.c
View File

@@ -59,7 +59,7 @@ struct ad_lavc_params {
const struct m_sub_options ad_lavc_conf = {
.opts = (const m_option_t[]) {
OPT_FLOATRANGE("ac3drc", ac3drc, 0, 0, 2),
OPT_FLOATRANGE("ac3drc", ac3drc, 0, 0, 6),
OPT_FLAG("downmix", downmix, 0),
OPT_INTRANGE("threads", threads, 0, 1, 16),
OPT_KEYVALUELIST("o", avopts, 0),
@@ -67,7 +67,7 @@ const struct m_sub_options ad_lavc_conf = {
},
.size = sizeof(struct ad_lavc_params),
.defaults = &(const struct ad_lavc_params){
.ac3drc = 1.,
.ac3drc = 0,
.downmix = 1,
.threads = 1,
},