@item pullup
@item qp
@item rectangle
-@item remove_logo
+@item remove-logo
@item rgbtest
@item rotate
@item sab
scale='min(500\, iw*3/2):-1'
@end example
+@section select
+Select frames to pass in output.
+
+It accepts in input an expression, which is evaluated for each input
+frame. If the expression is evaluated to a non-zero value, the frame
+is selected and passed to the output, otherwise it is discarded.
+
+The expression can contain the following constants:
+
+@table @option
+@item PI
+Greek PI
+
+@item PHI
+golden ratio
+
+@item E
+Euler number
+
+@item n
+the sequential number of the filtered frame, starting from 0
+
+@item selected_n
+the sequential number of the selected frame, starting from 0
+
+@item prev_selected_n
+the sequential number of the last selected frame, NAN if undefined
+
+@item TB
+timebase of the input timestamps
+
+@item pts
+the PTS (Presentation TimeStamp) of the filtered video frame,
+expressed in @var{TB} units, NAN if undefined
+
+@item t
+the PTS (Presentation TimeStamp) of the filtered video frame,
+expressed in seconds, NAN if undefined
+
+@item prev_pts
+the PTS of the previously filtered video frame, NAN if undefined
+
+@item prev_selected_pts
+the PTS of the last previously filtered video frame, NAN if undefined
+
+@item prev_selected_t
+the PTS of the last previously selected video frame, NAN if undefined
+
+@item start_pts
+the PTS of the first video frame in the video, NAN if undefined
+
+@item start_t
+the time of the first video frame in the video, NAN if undefined
+
+@item pict_type
+the picture type of the filtered frame, can assume one of the following
+values:
+@table @option
+@item PICT_TYPE_I
+@item PICT_TYPE_P
+@item PICT_TYPE_B
+@item PICT_TYPE_S
+@item PICT_TYPE_SI
+@item PICT_TYPE_SP
+@item PICT_TYPE_BI
+@end table
+
+@item interlace_type
+the frame interlace type, can assume one of the following values:
+@table @option
+@item INTERLACE_TYPE_P
+the frame is progressive (not interlaced)
+@item INTERLACE_TYPE_T
+the frame is top-field-first
+@item INTERLACE_TYPE_B
+the frame is bottom-field-first
+@end table
+
+@item key
+1 if the filtered frame is a key-frame, 0 otherwise
+
+@item pos
+the position in the file of the filtered frame, -1 if the information
+is not available (e.g. for synthetic video)
+@end table
+
+The default value of the select expression is "1".
+
+Some examples follow:
+
+@example
+# select all frames in input
+select
+
+# the above is the same as:
+select=1
+
+# skip all frames:
+select=0
+
+# select only I-frames
+select='eq(pict_type\,PICT_TYPE_I)'
+
+# select one frame every 100
+select='not(mod(n\,100))'
+
+# select only frames contained in the 10-20 time interval
+select='gte(t\,10)*lte(t\,20)'
+
+# select only I frames contained in the 10-20 time interval
+select='gte(t\,10)*lte(t\,20)*eq(pict_type\,PICT_TYPE_I)'
+
+# select frames with a minimum distance of 10 seconds
+select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
+@end example
+
@anchor{setdar}
@section setdar
the @code{av_get_picture_type_char} function defined in
@file{libavutil/avutil.h}.
-@item crc
-Adler-32 CRC of the input frame
+@item checksum
+Adler-32 checksum of all the planes of the input frame
-@item plane_crc
-Adler-32 CRC of each plane of the input frame, expressed in the form
-"[@var{crc0} @var{crc1} @var{crc2} @var{crc3}]"
+@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}]"
@end table
@section slicify
Adding this in the beginning of filter chains should make filtering
faster due to better use of the memory cache.
+@section split
+
+Pass on the input video to two outputs. Both outputs are identical to
+the input video.
+
+For example:
+@example
+[in] split [splitout1][splitout2];
+[splitout1] crop=100:100:0:0 [cropout];
+[splitout2] pad=200:200:100:100 [padout];
+@end example
+
+will create two separate outputs from the same input, one cropped and
+one padded.
+
@section transpose
Transpose rows with columns in the input video and optionally flip it.
through the interface defined in @file{libavfilter/vsrc_buffer.h}.
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{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 need to be explicitely defined.
+All the parameters but @var{scale_params} need to be explicitely
+defined.
Follows the list of the accepted parameters.
@item sample_aspect_ratio.num, sample_aspect_ratio.den
Specify numerator and denominator of the sample aspect ratio assumed
by the video frames.
+
+@item scale_params
+Specify the optional parameters to be used for the scale filter which
+is automatically inserted when an input change is detected in the
+input size or format.
@end table
For example:
(check the enum PixelFormat definition in @file{libavutil/pixfmt.h}),
this example corresponds to:
@example
-buffer=320:240:6:1:24
+buffer=320:240:6:1:24:1:1
@end example
@section color
projects / ffmpeg / blobdiff