constants:
@table @option
+@item FRAME_RATE
+frame rate, only defined for constant frame-rate video
+
@item PTS
the presentation timestamp in input
@end itemize
+@section bs2b
+Bauer stereo to binaural transformation, which improves headphone listening of
+stereo audio records.
+
+It accepts the following parameters:
+@table @option
+
+@item profile
+Pre-defined crossfeed level.
+@table @option
+
+@item default
+Default level (fcut=700, feed=50).
+
+@item cmoy
+Chu Moy circuit (fcut=700, feed=60).
+
+@item jmeier
+Jan Meier circuit (fcut=650, feed=95).
+
+@end table
+
+@item fcut
+Cut frequency (in Hz).
+
+@item feed
+Feed level (in Hz).
+
+@end table
+
@section channelsplit
Split each channel from an input audio stream into a separate output stream.
@example
avconv -i in.wav -filter_complex
'channelsplit=channel_layout=5.1[FL][FR][FC][LFE][SL][SR]'
--map '[FL]' front_left.wav -map '[FR]' front_right.wav -map '[FC]'
-front_center.wav -map '[LFE]' lfe.wav -map '[SL]' side_left.wav -map '[SR]'
-side_right.wav
+-map '[FL]' front_left.wav -map '[FR]' front_right.wav
+-map '[FC]' front_center.wav -map '[LFE]' low_frequency_effects.wav
+-map '[SL]' side_left.wav -map '[SR]' side_right.wav
@end example
@section channelmap
To fix a 5.1 WAV improperly encoded in AAC's native channel order
@example
-avconv -i in.wav -filter 'channelmap=1|2|0|5|3|4:channel_layout=5.1' out.wav
+avconv -i in.wav -filter 'channelmap=1|2|0|5|3|4:5.1' out.wav
@end example
@section compand
out
@end example
+@section hdcd
+
+Decodes High Definition Compatible Digital (HDCD) data. A 16-bit PCM stream with
+embedded HDCD codes is expanded into a 20-bit PCM stream.
+
+The filter supports the Peak Extend and Low-level Gain Adjustment features
+of HDCD, and detects the Transient Filter flag.
+
+@example
+avconv -i HDCD16.flac -af hdcd OUT24.flac
+@end example
+
+When using the filter with WAV, note that the default encoding for WAV is 16-bit,
+so the resulting 20-bit stream will be truncated back to 16-bit. Use something
+like @command{-acodec pcm_s24le} after the filter to get 24-bit PCM output.
+@example
+avconv -i HDCD16.wav -af hdcd OUT16.wav
+avconv -i HDCD16.wav -af hdcd -acodec pcm_s24le OUT24.wav
+@end example
+
+The filter accepts the following options:
+
+@table @option
+@item analyze_mode
+Replace audio with a solid tone and adjust the amplitude to signal some
+specific aspect of the decoding process. The output file can be loaded in
+an audio editor alongside the original to aid analysis.
+
+Modes are:
+@table @samp
+@item 0, off
+Disabled
+@item 1, lle
+Gain adjustment level at each sample
+@item 2, pe
+Samples where peak extend occurs
+@item 3, cdt
+Samples where the code detect timer is active
+@item 4, tgm
+Samples where the target gain does not match between channels
+@item 5, pel
+Any samples above peak extend level
+@item 6, ltgm
+Gain adjustment level at each sample, in each channel
+@end table
+@end table
+
@section resample
Convert the audio sample format, sample rate and channel layout. It is
not meant to be used directly; it is inserted automatically by libavfilter
To enable compilation of this filter, you need to configure Libav with
@code{--enable-libfreetype}.
+To enable default font fallback and the @var{font} option you need to
+configure Libav with @code{--enable-libfontconfig}.
The filter also recognizes strftime() sequences in the provided text
and expands them accordingly. Check the documentation of strftime().
@table @option
+@item font
+The font family to be used for drawing text. By default Sans.
+
@item fontfile
The font file to be used for drawing text. The path must be included.
-This parameter is mandatory.
+This parameter is mandatory if the fontconfig support is disabled.
@item text
The text string to be drawn. The text must be a sequence of UTF-8
The default value of @var{x} and @var{y} is 0.
+@item draw
+Draw the text only if the expression evaluates as non-zero.
+The expression accepts the same variables @var{x, y} do.
+The default value is 1.
+
+@item alpha
+Draw the text applying alpha blending. The value can
+be either a number between 0.0 and 1.0
+The expression accepts the same variables @var{x, y} do.
+The default value is 1.
+
@item fontsize
The font size to be used for drawing text.
The default value of @var{fontsize} is 16.
@section gradfun
Fix the banding artifacts that are sometimes introduced into nearly flat
-regions by truncation to 8bit colordepth.
+regions by truncation to 8-bit colordepth.
Interpolate the gradients that should go where the bands are, and
dither them.
@var{luma_tmp}*@var{chroma_spatial}/@var{luma_spatial}.
@end table
+@section hwupload_cuda
+
+Upload system memory frames to a CUDA device.
+
+It accepts the following optional parameters:
+
+@table @option
+@item device
+The number of the CUDA device to use
+@end table
+
@section interlace
Simple interlacing filter from progressive contents. This interleaves upper (or
lower) lines from odd frames with lower (or upper) lines from even frames,
-halving the frame rate and preserving image height. A vertical lowpass filter
-is always applied in order to avoid twitter effects and reduce moiré patterns.
+halving the frame rate and preserving image height.
@example
Original Original New Frame
@item scan
This determines whether the interlaced frame is taken from the even
(tff - default) or odd (bff) lines of the progressive frame.
+
+@item lowpass
+Enable (default) or disable the vertical lowpass filter to avoid twitter
+interlacing and reduce moire patterns.
@end table
@section lut, lutrgb, lutyuv
Overlay one video on top of another.
It takes two inputs and has one output. The first input is the "main"
-video on which the second input is overlayed.
+video on which the second input is overlaid.
It accepts the following parameters:
scale=w='min(500\, iw*3/2):h=-1'
@end example
+@section scale_npp
+
+Use the NVIDIA Performance Primitives (libnpp) to perform scaling and/or pixel
+format conversion on CUDA video frames. Setting the output width and height
+works in the same way as for the @var{scale} filter.
+
+The following additional options are accepted:
+@table @option
+@item format
+The pixel format of the output CUDA frames. If set to the string "same" (the
+default), the input format will be kept. Note that automatic format negotiation
+and conversion is not yet supported for hardware frames
+
+@item interp_algo
+The interpolation algorithm used for resizing. One of the following:
+@table @option
+@item nn
+Nearest neighbour.
+
+@item linear
+@item cubic
+@item cubic2p_bspline
+2-parameter cubic (B=1, C=0)
+
+@item cubic2p_catmullrom
+2-parameter cubic (B=0, C=1/2)
+
+@item cubic2p_b05c03
+2-parameter cubic (B=1/2, C=3/10)
+
+@item super
+Supersampling
+
+@item lanczos
+@end table
+
+@end table
+
@section select
Select frames to pass in output.
# 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 only I-frames contained in the 10-20 time interval
select='gte(t\,10)*lte(t\,20)*eq(pict_type\,I)'
# Select frames with a minimum distance of 10 seconds
@item sar
The sample (pixel) aspect ratio of the input video.
+@item hw_frames_ctx
+When using a hardware pixel format, this should be a reference to an
+AVHWFramesContext describing input frames.
+
@end table
For example:
The following graph description will generate a red source
with an opacity of 0.2, with size "qcif" and a frame rate of 10
-frames per second, which will be overlayed over the source connected
+frames per second, which will be overlaid over the source connected
to the pad with identifier "in":
@example
An example:
@example
# Generate a frei0r partik0l source with size 200x200 and framerate 10
-# which is overlayed on the overlay filter main input
+# which is overlaid on the overlay filter's main input
frei0r_src=size=200x200:framerate=10:filter_name=partik0l:filter_params=1234 [overlay]; [in][overlay] overlay
@end example
projects / ffmpeg / blobdiff