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FAQ: add an entry for common error when using -profile

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Anton Khirnov 2011-12-25 13:48:06 +01:00
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doc/faq.texi
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@ -266,6 +266,26 @@ avconv -f u16le -acodec pcm_s16le -ac 2 -ar 44100 -i all.a \
rm temp[12].[av] all.[av]
@end example
@section -profile option fails when encoding H.264 video with AAC audio
@command{avconv} prints an error like
@example
Undefined constant or missing '(' in 'baseline'
Unable to parse option value "baseline"
Error setting option profile to value baseline.
@end example
Short answer: write @option{-profile:v} instead of @option{-profile}.
Long answer: this happens because the @option{-profile} option can apply to both
video and audio. Specifically the AAC encoder also defines some profiles, none
of which are named @var{baseline}.
The solution is to apply the @option{-profile} option to the video stream only
by using @url{http://libav.org/avconv.html#Stream-specifiers-1, Stream specifiers}.
Appending @code{:v} to it will do exactly that.
@chapter Development
@section Are there examples illustrating how to use the Libav libraries, particularly libavcodec and libavformat?