patched ffmpeg nov 2

source/patched-ffmpeg-mt/doc/filters.texi

 @chapter Audio Filters
 @c man begin AUDIO FILTERS
 
 When you configure your FFmpeg build, you can disable any of the
 existing filters using --disable-filters.
 The configure output will show the audio filters included in your
 build.
 
 Below is a description of the currently available audio filters.
 
@@ skipping 172 matching lines @@
 # trembling effect
 "crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)"
 
 # erratic camera effect depending on timestamp and position
 "crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(t*10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t*13)"
 
 # set x depending on the value of y
 "crop=in_w/2:in_h/2:y:10+10*sin(n/10)"
 @end example
 
+@section cropdetect
+
+Auto-detect crop size.
+
+Calculate necessary cropping parameters and prints the recommended
+parameters through the logging system. The detected dimensions
+correspond to the non-black area of the input video.
+
+It accepts the syntax:
+@example
+cropdetect[=@var{limit}:@var{round}[:@var{reset}]]
+@end example
+
+@table @option
+
+@item limit
+Threshold, which can be optionally specified from nothing (0) to
+everything (255), defaults to 24.
+
+@item round
+Value which the width/height should be divisible by, defaults to
+16. The offset is automatically adjusted to center the video. Use 2 to
+get only even dimensions (needed for 4:2:2 video). 16 is best when
+encoding to most video codecs.
+
+@item reset
+Counter that determines after how many frames cropdetect will reset
+the previously detected largest video area and start over to detect
+the current optimal crop area. Defaults to 0.
+
+This can be useful when channel logos distort the video area. 0
+indicates never reset and return the largest area encountered during
+playback.
+@end table
+
 @section drawbox
 
 Draw a colored box on the input image.
 
 It accepts the syntax:
 @example
 drawbox=@var{x}:@var{y}:@var{width}:@var{height}:@var{color}
 @end example
 
 @table @option
@@ skipping 218 matching lines @@
 
 If the value for @var{width} or @var{height} is 0, the respective input
 size is used for the output.
 
 If the value for @var{width} or @var{height} is -1, the scale filter will
 use, for the respective output size, a value that maintains the aspect
 ratio of the input image.
 
 The default value of @var{width} and @var{height} is 0.
 
+@section settb
+
+Set the timebase to use for the output frames timestamps.
+It is mainly useful for testing timebase configuration.
+
+It accepts in input an arithmetic expression representing a rational.
+The expression can contain the constants "PI", "E", "PHI", "AVTB" (the
+default timebase), and "intb" (the input timebase).
+
+The default value for the input is "intb".
+
+Follow some examples.
+
+@example
+# set the timebase to 1/25
+settb=1/25
+
+# set the timebase to 1/10
+settb=0.1
+
+#set the timebase to 1001/1000
+settb=1+0.001
+
+#set the timebase to 2*intb
+settb=2*intb
+
+#set the default timebase value
+settb=AVTB
+@end example
+
 @section slicify
 
 Pass the images of input video on to next video filter as multiple
 slices.
 
 @example
 ./ffmpeg -i in.avi -vf "slicify=32" out.avi
 @end example
 
 The filter accepts the slice height as parameter. If the parameter is
 not specified it will use the default value of 16.
 
 Adding this in the beginning of filter chains should make filtering
 faster due to better use of the memory cache.
 
+@section transpose
+
+Transpose rows with columns in the input video and optionally flip it.
+
+It accepts a parameter representing an integer, which can assume the
+values:
+
+@table @samp
+@item 0
+Rotate by 90 degrees counterclockwise and vertically flip (default), that is:
+@example
+L.R     L.l
+. . ->  . .
+l.r     R.r
+@end example
+
+@item 1
+Rotate by 90 degrees clockwise, that is:
+@example
+L.R     l.L
+. . ->  . .
+l.r     r.R
+@end example
+
+@item 2
+Rotate by 90 degrees counterclockwise, that is:
+@example
+L.R     R.r
+. . ->  . .
+l.r     L.l
+@end example
+
+@item 3
+Rotate by 90 degrees clockwise and vertically flip, that is:
+@example
+L.R     r.R
+. . ->  . .
+l.r     l.L
+@end example
+@end table
+
 @section unsharp
 
 Sharpen or blur the input video.
 
 It accepts the following parameters:
 @var{luma_msize_x}:@var{luma_msize_y}:@var{luma_amount}:@var{chroma_msize_x}:@var{chroma_msize_y}:@var{chroma_amount}
 
 Negative values for the amount will blur the input video, while positive
 values will sharpen. All parameters are optional and default to the
 equivalent of the string '5:5:1.0:0:0:0.0'.
@@ skipping 83 matching lines @@
 Below is a description of the currently available video sources.
 
 @section buffer
 
 Buffer video frames, and make them available to the filter chain.
 
 This source is mainly intended for a programmatic use, in particular
 through the interface defined in @file{libavfilter/vsrc_buffer.h}.
 
 It accepts the following parameters:
-@var{width}:@var{height}:@var{pix_fmt_string}
+@var{width}:@var{height}:@var{pix_fmt_string}:@var{timebase_num}:@var{timebase_den}
 
 All the parameters need to be explicitely defined.
 
 Follows the list of the accepted parameters.
 
 @table @option
 
 @item width, height
 Specify the width and height of the buffered video frames.
 
 @item pix_fmt_string
-
 A string representing the pixel format of the buffered video frames.
 It may be a number corresponding to a pixel format, or a pixel format
 name.
 
+@item timebase_num, timebase_den
+Specify numerator and denomitor of the timebase assumed by the
+timestamps of the buffered frames.
 @end table
 
 For example:
 @example
-buffer=320:240:yuv410p
+buffer=320:240:yuv410p:1:24
 @end example
 
 will instruct the source to accept video frames with size 320x240 and
-with format "yuv410p". Since the pixel format with name "yuv410p"
-corresponds to the number 6 (check the enum PixelFormat definition in
-@file{libavutil/pixfmt.h}), this example corresponds to:
+with format "yuv410p" and assuming 1/24 as the timestamps timebase.
+Since the pixel format with name "yuv410p" corresponds to the number 6
+(check the enum PixelFormat definition in @file{libavutil/pixfmt.h}),
+this example corresponds to:
 @example
-buffer=320:240:6
+buffer=320:240:6:1:24
 @end example
 
 @section color
 
 Provide an uniformly colored input.
 
 It accepts the following parameters:
 @var{color}:@var{frame_size}:@var{frame_rate}
 
 Follows the description of the accepted parameters.
@@ skipping 27 matching lines @@
 @example
 "color=red@@0.2:qcif:10 [color]; [in][color] overlay [out]"
 @end example
 
 @section nullsrc
 
 Null video source, never return images. It is mainly useful as a
 template and to be employed in analysis / debugging tools.
 
 It accepts as optional parameter a string of the form
-@var{width}:@var{height}, where @var{width} and @var{height} specify the size of
-the configured source.
+@var{width}:@var{height}:@var{timebase}.
 
-The default values of @var{width} and @var{height} are respectively 352
-and 288 (corresponding to the CIF size format).
+@var{width} and @var{height} specify the size of the configured
+source. The default values of @var{width} and @var{height} are
+respectively 352 and 288 (corresponding to the CIF size format).
+
+@var{timebase} specifies an arithmetic expression representing a
+timebase. The expression can contain the constants "PI", "E", "PHI",
+"AVTB" (the default timebase), and defaults to the value "AVTB".
 
 @c man end VIDEO SOURCES
 
 @chapter Video Sinks
 @c man begin VIDEO SINKS
 
 Below is a description of the currently available video sinks.
 
 @section nullsink
 
 Null video sink, do absolutely nothing with the input video. It is
 mainly useful as a template and to be employed in analysis / debugging
 tools.
 
 @c man end VIDEO SINKS