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avconv: move codec tags to options context.
Add a new -tag option, make -[vas]tag an alias for -tag:[vas]
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@@ -564,7 +564,7 @@ top=1/bottom=0/auto=-1 field first
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@item -dc @var{precision}
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Intra_dc_precision.
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@item -vtag @var{fourcc/tag}
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Force video tag/fourcc.
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Force video tag/fourcc. This is an alias for @code{-tag:v}.
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@item -qphist
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Show QP histogram.
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@item -force_key_frames @var{time}[,@var{time}...]
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@@ -604,7 +604,7 @@ Set the ISO 639 language code (3 letters) of the current audio stream.
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@table @option
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@item -atag @var{fourcc/tag}
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Force audio tag/fourcc.
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Force audio tag/fourcc. This is an alias for @code{-tag:a}.
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@item -audio_service_type @var{type}
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Set the type of service that the audio stream contains.
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@table @option
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@@ -811,6 +811,9 @@ avconv -i h264.mp4 -c:v copy -vbsf h264_mp4toannexb -an out.h264
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@example
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avconv -i file.mov -an -vn -sbsf mov2textsub -c:s copy -f rawvideo sub.txt
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@end example
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@item -tag[:@var{stream_specifier}] @var{codec_tag}
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Force a tag/fourcc for matching streams.
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@end table
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@c man end OPTIONS
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