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manpage: clarify --af=format

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Kevin Mitchell 2015-04-15 03:48:05 -07:00
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commit 3f8b8b8c0c
1 changed files with 16 additions and 14 deletions
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DOCS/man/af.rst
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@ -225,14 +225,21 @@ Available filters are:
automatically up- and downmix standard channel layouts.
``format=format:srate:channels:out-format:out-srate:out-channels``
Force a specific audio format/configuration without actually changing the
audio data. Keep in mind that the filter system might auto-insert actual
conversion filters before or after this filter if needed.
Does not do any format conversion itself. Rather, it may cause the
filter system to insert necessary conversion filters before or after this
filter if needed. It is primarily useful for controlling the audio format
going into other filters. To specify the format for audio output, see
``--audio-format``, ``--audio-samplerate``, and ``--audio-channels``. This
filter is able to force a particular format, whereas ``--audio-*``
may be overridden by the ao based on output compatibility.
All parameters are optional. The first 3 parameters restrict what the filter
accepts as input. The ``out-`` parameters change the audio format, without
actually doing a conversion. The data will be 'reinterpreted' by the
filters or audio outputs following this filter.
accepts as input. They will therefore cause conversion filters to be
inserted before this one. The ``out-`` parameters tell the filters or audio
outputs following this filter how to interpret the data without actually
doing a conversion. Setting these will probably just break things unless you
really know you want this for some reason, such as testing or dealing with
broken media.
``<format>``
Force conversion to this format. Use ``--af=format=format=help`` to get
@ -252,14 +259,9 @@ Available filters are:
``<out-channels>``
See also ``--audio-format``, ``--audio-samplerate``, and
``--audio-channels`` for related options. Keep in mind that
``--audio-channels`` does not actually force the number of
channels in most cases, while this filter can do this.
*NOTE*: this filter used to be named ``force``. Also, unlike the old
``format`` filter, this does not do any actual conversion anymore.
Conversion is done by other, automatically inserted filters.
*NOTE*: this filter used to be named ``force``. The old ``format`` filter
used to do conversion itself, unlike this one which lets the filter system
handle the conversion.
``convert24``
Filter for internal use only. Converts between 24-bit and 32-bit sample