From a58db9d283ced3eb443b3123e6e742dfd0614bc4 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Fri, 24 Jun 2011 11:22:15 +0200 Subject: [PATCH] doc: update ffmpeg -ar and -ac documentation to reflect reality. --- doc/ffmpeg.texi | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index 6e7fd1390d..5246b18640 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -551,19 +551,19 @@ The timestamps must be specified in ascending order. @item -aframes @var{number} Set the number of audio frames to record. @item -ar @var{freq} -Set the audio sampling frequency. For input streams it is set by -default to 44100 Hz, for output streams it is set by default to the -frequency of the input stream. If the input file has audio streams -with different frequencies, the behaviour is undefined. +Set the audio sampling frequency. For output streams it is set by +default to the frequency of the corresponding input stream. For input +streams this option only makes sense for audio grabbing devices and raw +demuxers and is mapped to the corresponding demuxer options. @item -ab @var{bitrate} Set the audio bitrate in bit/s (default = 64k). @item -aq @var{q} Set the audio quality (codec-specific, VBR). @item -ac @var{channels} -Set the number of audio channels. For input streams it is set by -default to 1, for output streams it is set by default to the same -number of audio channels in input. If the input file has audio streams -with different channel count, the behaviour is undefined. +Set the number of audio channels. For output streams it is set by +default to the number of input audio channels. For input streams +this option only makes sense for audio grabbing devices and raw demuxers +and is mapped to the corresponding demuxer options. @item -an Disable audio recording. @item -acodec @var{codec}