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doc: update ffmpeg -ar and -ac documentation to reflect reality.

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Anton Khirnov
2011-06-24 11:22:15 +02:00
parent 20f9f21fd4
commit a58db9d283
1 changed files with 8 additions and 8 deletions
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doc/ffmpeg.texi
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@@ -551,19 +551,19 @@ The timestamps must be specified in ascending order.
@item -aframes @var{number} @item -aframes @var{number}
Set the number of audio frames to record. Set the number of audio frames to record.
@item -ar @var{freq} @item -ar @var{freq}
Set the audio sampling frequency. For input streams it is set by Set the audio sampling frequency. For output streams it is set by
default to 44100 Hz, for output streams it is set by default to the default to the frequency of the corresponding input stream. For input
frequency of the input stream. If the input file has audio streams streams this option only makes sense for audio grabbing devices and raw
with different frequencies, the behaviour is undefined. demuxers and is mapped to the corresponding demuxer options.
@item -ab @var{bitrate} @item -ab @var{bitrate}
Set the audio bitrate in bit/s (default = 64k). Set the audio bitrate in bit/s (default = 64k).
@item -aq @var{q} @item -aq @var{q}
Set the audio quality (codec-specific, VBR). Set the audio quality (codec-specific, VBR).
@item -ac @var{channels} @item -ac @var{channels}
Set the number of audio channels. For input streams it is set by Set the number of audio channels. For output streams it is set by
default to 1, for output streams it is set by default to the same default to the number of input audio channels. For input streams
number of audio channels in input. If the input file has audio streams this option only makes sense for audio grabbing devices and raw demuxers
with different channel count, the behaviour is undefined. and is mapped to the corresponding demuxer options.
@item -an @item -an
Disable audio recording. Disable audio recording.
@item -acodec @var{codec} @item -acodec @var{codec}