the corresponding numeric value defined in @file{libavutil/samplefmt.h}.
@var{channel_layout} specifies the channel layout, and can be a string
-or the corresponding number value defined in @file{libavutil/chlayout.h}.
+or the corresponding number value defined in @file{libavutil/audioconvert.h}.
@var{packing_format} specifies the type of packing in output, can be one
of "planar" or "packed", or the corresponding numeric values "0" or "1".
@item pos
position of the frame in the input stream, -1 if this information in
-unavailable and/or meanigless (for example in case of synthetic audio)
+unavailable and/or meaningless (for example in case of synthetic audio)
@item fmt
sample format name
if the packing format is planar, 0 if packed
@item checksum
-Adler-32 checksum of all the planes of the input frame
+Adler-32 checksum (printed in hexadecimal) of all the planes of the input frame
@item plane_checksum
-Adler-32 checksum for each input frame plane, expressed in the form
-"[@var{c0} @var{c1} @var{c2} @var{c3} @var{c4} @var{c5} @var{c6} @var{c7}]"
+Adler-32 checksum (printed in hexadecimal) for each input frame plane,
+expressed in the form "[@var{c0} @var{c1} @var{c2} @var{c3} @var{c4} @var{c5}
+@var{c6} @var{c7}]"
@end table
+@section earwax
+
+Make audio easier to listen to on headphones.
+
+This filter adds `cues' to 44.1kHz stereo (i.e. audio CD format) audio
+so that when listened to on headphones the stereo image is moved from
+inside your head (standard for headphones) to outside and in front of
+the listener (standard for speakers).
+
+Ported from SoX.
+
+@section volume
+
+Adjust the input audio volume.
+
+The filter accepts exactly one parameter @var{vol}, which expresses
+how the audio volume will be increased or decreased.
+
+Output values are clipped to the maximum value.
+
+If @var{vol} is expressed as a decimal number, and the output audio
+volume is given by the relation:
+@example
+@var{output_volume} = @var{vol} * @var{input_volume}
+@end example
+
+If @var{vol} is expressed as a decimal number followed by the string
+"dB", the value represents the requested change in decibels of the
+input audio power, and the output audio volume is given by the
+relation:
+@example
+@var{output_volume} = 10^(@var{vol}/20) * @var{input_volume}
+@end example
+
+Otherwise @var{vol} is considered an expression and its evaluated
+value is used for computing the output audio volume according to the
+first relation.
+
+Default value for @var{vol} is 1.0.
+
+@subsection Examples
+
+@itemize
+@item
+Half the input audio volume:
+@example
+volume=0.5
+@end example
+
+The above example is equivalent to:
+@example
+volume=1/2
+@end example
+
+@item
+Decrease input audio power by 12 decibels:
+@example
+volume=-12dB
+@end example
+@end itemize
+
@c man end AUDIO FILTERS
@chapter Audio Sources
@table @option
@item x, y, w, h
-Specify a rectangular area where to limit the sarch for motion
+Specify a rectangular area where to limit the search for motion
vectors.
If desired the search for motion vectors can be limited to a
rectangular area of the frame defined by its top left corner, width
Apply fade-in/out effect to input video.
It accepts the parameters:
-@var{type}:@var{start_frame}:@var{nb_frames}
+@var{type}:@var{start_frame}:@var{nb_frames}[:@var{options}]
@var{type} specifies if the effect type, can be either "in" for
fade-in, or "out" for a fade-out effect.
will have the same intensity as the input video, at the end of the
fade-out transition the output video will be completely black.
+@var{options} is an optional sequence of @var{key}=@var{value} pairs,
+separated by ":". The description of the accepted options follows.
+
+@table @option
+
+@item type, t
+See @var{type}.
+
+@item start_frame, s
+See @var{start_frame}.
+
+@item nb_frames, n
+See @var{nb_frames}.
+
+@end table
+
A few usage examples follow, usable too as test scenarios.
@example
# fade in first 30 frames of video
It takes two inputs and one output, the first input is the "main"
video on which the second input is overlayed.
-It accepts the parameters: @var{x}:@var{y}.
+It accepts the parameters: @var{x}:@var{y}[:@var{options}].
@var{x} is the x coordinate of the overlayed video on the main video,
-@var{y} is the y coordinate. The parameters are expressions containing
+@var{y} is the y coordinate. @var{x} and @var{y} are expressions containing
the following parameters:
@table @option
same as @var{overlay_w} and @var{overlay_h}
@end table
+@var{options} is an optional list of @var{key}=@var{value} pairs,
+separated by ":".
+
+The description of the accepted options follows.
+
+@table @option
+@item rgb
+If set to 1, force the filter to accept inputs in the RGB
+colorspace. Default value is 0.
+@end table
+
Be aware that frames are taken from each input video in timestamp
order, hence, if their initial timestamps differ, it is a a good idea
to pass the two inputs through a @var{setpts=PTS-STARTPTS} filter to
color=red@.3:WxH [over]; [in][over] overlay [out]
@end example
-You can chain togheter more overlays but the efficiency of such
+You can chain together more overlays but the efficiency of such
approach is yet to be tested.
@section pad
@file{libavutil/avutil.h}.
@item checksum
-Adler-32 checksum of all the planes of the input frame
+Adler-32 checksum (printed in hexadecimal) of all the planes of the input frame
@item plane_checksum
-Adler-32 checksum of each plane of the input frame, expressed in the form
-"[@var{c0} @var{c1} @var{c2} @var{c3}]"
+Adler-32 checksum (printed in hexadecimal) of each plane of the input frame,
+expressed in the form "[@var{c0} @var{c1} @var{c2} @var{c3}]"
@end table
@section slicify
It accepts the following parameters:
@var{width}:@var{height}:@var{pix_fmt_string}:@var{timebase_num}:@var{timebase_den}:@var{sample_aspect_ratio_num}:@var{sample_aspect_ratio.den}:@var{scale_params}
-All the parameters but @var{scale_params} need to be explicitely
+All the parameters but @var{scale_params} need to be explicitly
defined.
Follows the list of the accepted parameters.
projects / ffmpeg / blobdiff