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@@ -17,11 +17,15 @@ with the options @code{--enable-encoder=@var{ENCODER}} / |
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The option @code{-codecs} of the ff* tools will display the list of |
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The option @code{-codecs} of the ff* tools will display the list of |
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enabled encoders. |
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enabled encoders. |
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A description of some of the currently available encoders follows. |
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@c man end ENCODERS |
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@chapter Audio Encoders |
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@c man begin AUDIO ENCODERS |
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@section Audio Encoders |
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A description of some of the currently available audio encoders |
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follows. |
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@subsection ac3 and ac3_fixed |
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@section ac3 and ac3_fixed |
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AC-3 audio encoders. |
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AC-3 audio encoders. |
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@@ -36,7 +40,7 @@ quality audio for a given bitrate. The @var{ac3_fixed} encoder is not the |
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default codec for any of the output formats, so it must be specified explicitly |
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default codec for any of the output formats, so it must be specified explicitly |
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using the option @code{-acodec ac3_fixed} in order to use it. |
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using the option @code{-acodec ac3_fixed} in order to use it. |
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@subheading AC-3 Metadata |
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@subsection AC-3 Metadata |
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The AC-3 metadata options are used to set parameters that describe the audio, |
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The AC-3 metadata options are used to set parameters that describe the audio, |
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but in most cases do not affect the audio encoding itself. Some of the options |
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but in most cases do not affect the audio encoding itself. Some of the options |
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@@ -55,7 +59,7 @@ documents. |
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@item @uref{http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf,Dolby Digital Professional Encoding Guidelines} |
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@item @uref{http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf,Dolby Digital Professional Encoding Guidelines} |
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@end itemize |
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@end itemize |
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@subsubheading Metadata Control Options |
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@subsubsection Metadata Control Options |
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@table @option |
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@table @option |
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@@ -72,7 +76,7 @@ Metadata values can be changed before encoding each frame. |
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@end table |
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@end table |
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@subsubheading Downmix Levels |
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@subsubsection Downmix Levels |
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@table @option |
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@table @option |
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@@ -106,7 +110,7 @@ Silence Surround Channel(s) |
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@end table |
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@end table |
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@subsubheading Audio Production Information |
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@subsubsection Audio Production Information |
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Audio Production Information is optional information describing the mixing |
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Audio Production Information is optional information describing the mixing |
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environment. Either none or both of the fields are written to the bitstream. |
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environment. Either none or both of the fields are written to the bitstream. |
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@@ -140,7 +144,7 @@ Small Room |
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@end table |
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@end table |
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@subsubheading Other Metadata Options |
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@subsubsection Other Metadata Options |
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@table @option |
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@table @option |
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@@ -195,7 +199,7 @@ Original Source (default) |
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@end table |
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@end table |
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@subsubheading Extended Bitstream Information |
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@subsection Extended Bitstream Information |
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The extended bitstream options are part of the Alternate Bit Stream Syntax as |
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The extended bitstream options are part of the Alternate Bit Stream Syntax as |
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specified in Annex D of the A/52:2010 standard. It is grouped into 2 parts. |
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specified in Annex D of the A/52:2010 standard. It is grouped into 2 parts. |
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If any one parameter in a group is specified, all values in that group will be |
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If any one parameter in a group is specified, all values in that group will be |
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@@ -205,7 +209,7 @@ will use these values instead of the ones specified in the @code{center_mixlev} |
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and @code{surround_mixlev} options if it supports the Alternate Bit Stream |
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and @code{surround_mixlev} options if it supports the Alternate Bit Stream |
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Syntax. |
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Syntax. |
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@subsubheading Extended Bitstream Information - Part 1 |
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@subsubsection Extended Bitstream Information - Part 1 |
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@table @option |
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@table @option |
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@@ -302,7 +306,7 @@ Silence Surround Channel(s) |
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@end table |
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@end table |
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@subsubheading Extended Bitstream Information - Part 2 |
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@subsubsection Extended Bitstream Information - Part 2 |
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@table @option |
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@table @option |
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@@ -353,7 +357,7 @@ HDCD A/D Converter |
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@end table |
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@end table |
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@subheading Other AC-3 Encoding Options |
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@subsection Other AC-3 Encoding Options |
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@table @option |
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@table @option |
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@@ -408,4 +412,4 @@ Selected by Encoder (default) |
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@end table |
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@end table |
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@c man end ENCODERS |
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@c man end AUDIO ENCODERS |