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.\" ========================================================================
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.\"
|
.IX Title "FFMPEG-BITSTREAM-FILTERS 1"
|
.TH FFMPEG-BITSTREAM-FILTERS 1 " " " " " "
|
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
|
.SH "NAME"
|
ffmpeg\-bitstream\-filters \- FFmpeg bitstream filters
|
.SH "DESCRIPTION"
|
.IX Header "DESCRIPTION"
|
This document describes the bitstream filters provided by the
|
libavcodec library.
|
.PP
|
A bitstream filter operates on the encoded stream data, and performs
|
bitstream level modifications without performing decoding.
|
.SH "BITSTREAM FILTERS"
|
.IX Header "BITSTREAM FILTERS"
|
When you configure your FFmpeg build, all the supported bitstream
|
filters are enabled by default. You can list all available ones using
|
the configure option \f(CW\*(C`\-\-list\-bsfs\*(C'\fR.
|
.PP
|
You can disable all the bitstream filters using the configure option
|
\&\f(CW\*(C`\-\-disable\-bsfs\*(C'\fR, and selectively enable any bitstream filter using
|
the option \f(CW\*(C`\-\-enable\-bsf=BSF\*(C'\fR, or you can disable a particular
|
bitstream filter using the option \f(CW\*(C`\-\-disable\-bsf=BSF\*(C'\fR.
|
.PP
|
The option \f(CW\*(C`\-bsfs\*(C'\fR of the ff* tools will display the list of
|
all the supported bitstream filters included in your build.
|
.PP
|
The ff* tools have a \-bsf option applied per stream, taking a
|
comma-separated list of filters, whose parameters follow the filter
|
name after a '='.
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT \-c:v copy \-bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT
|
.Ve
|
.PP
|
Below is a description of the currently available bitstream filters,
|
with their parameters, if any.
|
.SS "aac_adtstoasc"
|
.IX Subsection "aac_adtstoasc"
|
Convert \s-1MPEG\-2/4\s0 \s-1AAC\s0 \s-1ADTS\s0 to an \s-1MPEG\-4\s0 Audio Specific Configuration
|
bitstream.
|
.PP
|
This filter creates an \s-1MPEG\-4\s0 AudioSpecificConfig from an \s-1MPEG\-2/4\s0
|
\&\s-1ADTS\s0 header and removes the \s-1ADTS\s0 header.
|
.PP
|
This filter is required for example when copying an \s-1AAC\s0 stream from a
|
raw \s-1ADTS\s0 \s-1AAC\s0 or an MPEG-TS container to \s-1MP4A\-LATM\s0, to an \s-1FLV\s0 file, or
|
to \s-1MOV/MP4\s0 files and related formats such as 3GP or M4A. Please note
|
that it is auto-inserted for \s-1MP4A\-LATM\s0 and \s-1MOV/MP4\s0 and related formats.
|
.SS "av1_metadata"
|
.IX Subsection "av1_metadata"
|
Modify metadata embedded in an \s-1AV1\s0 stream.
|
.IP "\fBtd\fR" 4
|
.IX Item "td"
|
Insert or remove temporal delimiter OBUs in all temporal units of the
|
stream.
|
.RS 4
|
.IP "\fBinsert\fR" 4
|
.IX Item "insert"
|
Insert a \s-1TD\s0 at the beginning of every \s-1TU\s0 which does not already have one.
|
.IP "\fBremove\fR" 4
|
.IX Item "remove"
|
Remove the \s-1TD\s0 from the beginning of every \s-1TU\s0 which has one.
|
.RE
|
.RS 4
|
.RE
|
.IP "\fBcolor_primaries\fR" 4
|
.IX Item "color_primaries"
|
.PD 0
|
.IP "\fBtransfer_characteristics\fR" 4
|
.IX Item "transfer_characteristics"
|
.IP "\fBmatrix_coefficients\fR" 4
|
.IX Item "matrix_coefficients"
|
.PD
|
Set the color description fields in the stream (see \s-1AV1\s0 section 6.4.2).
|
.IP "\fBcolor_range\fR" 4
|
.IX Item "color_range"
|
Set the color range in the stream (see \s-1AV1\s0 section 6.4.2; note that
|
this cannot be set for streams using \s-1BT\s0.709 primaries, sRGB transfer
|
characteristic and identity (\s-1RGB\s0) matrix coefficients).
|
.RS 4
|
.IP "\fBtv\fR" 4
|
.IX Item "tv"
|
Limited range.
|
.IP "\fBpc\fR" 4
|
.IX Item "pc"
|
Full range.
|
.RE
|
.RS 4
|
.RE
|
.IP "\fBchroma_sample_position\fR" 4
|
.IX Item "chroma_sample_position"
|
Set the chroma sample location in the stream (see \s-1AV1\s0 section 6.4.2).
|
This can only be set for 4:2:0 streams.
|
.RS 4
|
.IP "\fBvertical\fR" 4
|
.IX Item "vertical"
|
Left position (matching the default in \s-1MPEG\-2\s0 and H.264).
|
.IP "\fBcolocated\fR" 4
|
.IX Item "colocated"
|
Top-left position.
|
.RE
|
.RS 4
|
.RE
|
.IP "\fBtick_rate\fR" 4
|
.IX Item "tick_rate"
|
Set the tick rate (\fInum_units_in_display_tick / time_scale\fR) in
|
the timing info in the sequence header.
|
.IP "\fBnum_ticks_per_picture\fR" 4
|
.IX Item "num_ticks_per_picture"
|
Set the number of ticks in each picture, to indicate that the stream
|
has a fixed framerate. Ignored if \fBtick_rate\fR is not also set.
|
.SS "chomp"
|
.IX Subsection "chomp"
|
Remove zero padding at the end of a packet.
|
.SS "dca_core"
|
.IX Subsection "dca_core"
|
Extract the core from a \s-1DCA/DTS\s0 stream, dropping extensions such as
|
DTS-HD.
|
.SS "dump_extra"
|
.IX Subsection "dump_extra"
|
Add extradata to the beginning of the filtered packets.
|
.IP "\fBfreq\fR" 4
|
.IX Item "freq"
|
The additional argument specifies which packets should be filtered.
|
It accepts the values:
|
.RS 4
|
.IP "\fBk\fR" 4
|
.IX Item "k"
|
.PD 0
|
.IP "\fBkeyframe\fR" 4
|
.IX Item "keyframe"
|
.PD
|
add extradata to all key packets
|
.IP "\fBe\fR" 4
|
.IX Item "e"
|
.PD 0
|
.IP "\fBall\fR" 4
|
.IX Item "all"
|
.PD
|
add extradata to all packets
|
.RE
|
.RS 4
|
.RE
|
.PP
|
If not specified it is assumed \fBe\fR.
|
.PP
|
For example the following \fBffmpeg\fR command forces a global
|
header (thus disabling individual packet headers) in the H.264 packets
|
generated by the \f(CW\*(C`libx264\*(C'\fR encoder, but corrects them by adding
|
the header stored in extradata to the key packets:
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT \-map 0 \-flags:v +global_header \-c:v libx264 \-bsf:v dump_extra out.ts
|
.Ve
|
.SS "eac3_core"
|
.IX Subsection "eac3_core"
|
Extract the core from a E\-AC\-3 stream, dropping extra channels.
|
.SS "extract_extradata"
|
.IX Subsection "extract_extradata"
|
Extract the in-band extradata.
|
.PP
|
Certain codecs allow the long-term headers (e.g. \s-1MPEG\-2\s0 sequence headers,
|
or H.264/HEVC (\s-1VPS/\s0)SPS/PPS) to be transmitted either \*(L"in-band\*(R" (i.e. as a part
|
of the bitstream containing the coded frames) or \*(L"out of band\*(R" (e.g. on the
|
container level). This latter form is called \*(L"extradata\*(R" in FFmpeg terminology.
|
.PP
|
This bitstream filter detects the in-band headers and makes them available as
|
extradata.
|
.IP "\fBremove\fR" 4
|
.IX Item "remove"
|
When this option is enabled, the long-term headers are removed from the
|
bitstream after extraction.
|
.SS "filter_units"
|
.IX Subsection "filter_units"
|
Remove units with types in or not in a given set from the stream.
|
.IP "\fBpass_types\fR" 4
|
.IX Item "pass_types"
|
List of unit types or ranges of unit types to pass through while removing
|
all others. This is specified as a '|'\-separated list of unit type values
|
or ranges of values with '\-'.
|
.IP "\fBremove_types\fR" 4
|
.IX Item "remove_types"
|
Identical to \fBpass_types\fR, except the units in the given set
|
removed and all others passed through.
|
.PP
|
Extradata is unchanged by this transformation, but note that if the stream
|
contains inline parameter sets then the output may be unusable if they are
|
removed.
|
.PP
|
For example, to remove all non-VCL \s-1NAL\s0 units from an H.264 stream:
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT \-c:v copy \-bsf:v \*(Aqfilter_units=pass_types=1\-5\*(Aq OUTPUT
|
.Ve
|
.PP
|
To remove all AUDs, \s-1SEI\s0 and filler from an H.265 stream:
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT \-c:v copy \-bsf:v \*(Aqfilter_units=remove_types=35|38\-40\*(Aq OUTPUT
|
.Ve
|
.SS "hapqa_extract"
|
.IX Subsection "hapqa_extract"
|
Extract Rgb or Alpha part of an \s-1HAPQA\s0 file, without recompression, in order to create an \s-1HAPQ\s0 or an HAPAlphaOnly file.
|
.IP "\fBtexture\fR" 4
|
.IX Item "texture"
|
Specifies the texture to keep.
|
.RS 4
|
.IP "\fBcolor\fR" 4
|
.IX Item "color"
|
.PD 0
|
.IP "\fBalpha\fR" 4
|
.IX Item "alpha"
|
.RE
|
.RS 4
|
.RE
|
.PD
|
.PP
|
Convert \s-1HAPQA\s0 to \s-1HAPQ\s0
|
.PP
|
.Vb 1
|
\& ffmpeg \-i hapqa_inputfile.mov \-c copy \-bsf:v hapqa_extract=texture=color \-tag:v HapY \-metadata:s:v:0 encoder="HAPQ" hapq_file.mov
|
.Ve
|
.PP
|
Convert \s-1HAPQA\s0 to HAPAlphaOnly
|
.PP
|
.Vb 1
|
\& ffmpeg \-i hapqa_inputfile.mov \-c copy \-bsf:v hapqa_extract=texture=alpha \-tag:v HapA \-metadata:s:v:0 encoder="HAPAlpha Only" hapalphaonly_file.mov
|
.Ve
|
.SS "h264_metadata"
|
.IX Subsection "h264_metadata"
|
Modify metadata embedded in an H.264 stream.
|
.IP "\fBaud\fR" 4
|
.IX Item "aud"
|
Insert or remove \s-1AUD\s0 \s-1NAL\s0 units in all access units of the stream.
|
.RS 4
|
.IP "\fBinsert\fR" 4
|
.IX Item "insert"
|
.PD 0
|
.IP "\fBremove\fR" 4
|
.IX Item "remove"
|
.RE
|
.RS 4
|
.RE
|
.IP "\fBsample_aspect_ratio\fR" 4
|
.IX Item "sample_aspect_ratio"
|
.PD
|
Set the sample aspect ratio of the stream in the \s-1VUI\s0 parameters.
|
.IP "\fBvideo_format\fR" 4
|
.IX Item "video_format"
|
.PD 0
|
.IP "\fBvideo_full_range_flag\fR" 4
|
.IX Item "video_full_range_flag"
|
.PD
|
Set the video format in the stream (see H.264 section E.2.1 and
|
table E\-2).
|
.IP "\fBcolour_primaries\fR" 4
|
.IX Item "colour_primaries"
|
.PD 0
|
.IP "\fBtransfer_characteristics\fR" 4
|
.IX Item "transfer_characteristics"
|
.IP "\fBmatrix_coefficients\fR" 4
|
.IX Item "matrix_coefficients"
|
.PD
|
Set the colour description in the stream (see H.264 section E.2.1
|
and tables E\-3, E\-4 and E\-5).
|
.IP "\fBchroma_sample_loc_type\fR" 4
|
.IX Item "chroma_sample_loc_type"
|
Set the chroma sample location in the stream (see H.264 section
|
E.2.1 and figure E\-1).
|
.IP "\fBtick_rate\fR" 4
|
.IX Item "tick_rate"
|
Set the tick rate (num_units_in_tick / time_scale) in the \s-1VUI\s0
|
parameters. This is the smallest time unit representable in the
|
stream, and in many cases represents the field rate of the stream
|
(double the frame rate).
|
.IP "\fBfixed_frame_rate_flag\fR" 4
|
.IX Item "fixed_frame_rate_flag"
|
Set whether the stream has fixed framerate \- typically this indicates
|
that the framerate is exactly half the tick rate, but the exact
|
meaning is dependent on interlacing and the picture structure (see
|
H.264 section E.2.1 and table E\-6).
|
.IP "\fBcrop_left\fR" 4
|
.IX Item "crop_left"
|
.PD 0
|
.IP "\fBcrop_right\fR" 4
|
.IX Item "crop_right"
|
.IP "\fBcrop_top\fR" 4
|
.IX Item "crop_top"
|
.IP "\fBcrop_bottom\fR" 4
|
.IX Item "crop_bottom"
|
.PD
|
Set the frame cropping offsets in the \s-1SPS\s0. These values will replace
|
the current ones if the stream is already cropped.
|
.Sp
|
These fields are set in pixels. Note that some sizes may not be
|
representable if the chroma is subsampled or the stream is interlaced
|
(see H.264 section 7.4.2.1.1).
|
.IP "\fBsei_user_data\fR" 4
|
.IX Item "sei_user_data"
|
Insert a string as \s-1SEI\s0 unregistered user data. The argument must
|
be of the form \fIUUID+string\fR, where the \s-1UUID\s0 is as hex digits
|
possibly separated by hyphens, and the string can be anything.
|
.Sp
|
For example, \fB086f3693\-b7b3\-4f2c\-9653\-21492feee5b8+hello\fR will
|
insert the string ``hello'' associated with the given \s-1UUID\s0.
|
.IP "\fBdelete_filler\fR" 4
|
.IX Item "delete_filler"
|
Deletes both filler \s-1NAL\s0 units and filler \s-1SEI\s0 messages.
|
.IP "\fBlevel\fR" 4
|
.IX Item "level"
|
Set the level in the \s-1SPS\s0. Refer to H.264 section A.3 and tables A\-1
|
to A\-5.
|
.Sp
|
The argument must be the name of a level (for example, \fB4.2\fR), a
|
level_idc value (for example, \fB42\fR), or the special name \fBauto\fR
|
indicating that the filter should attempt to guess the level from the
|
input stream properties.
|
.SS "h264_mp4toannexb"
|
.IX Subsection "h264_mp4toannexb"
|
Convert an H.264 bitstream from length prefixed mode to start code
|
prefixed mode (as defined in the Annex B of the ITU-T H.264
|
specification).
|
.PP
|
This is required by some streaming formats, typically the \s-1MPEG\-2\s0
|
transport stream format (muxer \f(CW\*(C`mpegts\*(C'\fR).
|
.PP
|
For example to remux an \s-1MP4\s0 file containing an H.264 stream to mpegts
|
format with \fBffmpeg\fR, you can use the command:
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT.mp4 \-codec copy \-bsf:v h264_mp4toannexb OUTPUT.ts
|
.Ve
|
.PP
|
Please note that this filter is auto-inserted for MPEG-TS (muxer
|
\&\f(CW\*(C`mpegts\*(C'\fR) and raw H.264 (muxer \f(CW\*(C`h264\*(C'\fR) output formats.
|
.SS "h264_redundant_pps"
|
.IX Subsection "h264_redundant_pps"
|
This applies a specific fixup to some Blu-ray streams which contain
|
redundant PPSs modifying irrelevant parameters of the stream which
|
confuse other transformations which require correct extradata.
|
.PP
|
A new single global \s-1PPS\s0 is created, and all of the redundant PPSs
|
within the stream are removed.
|
.SS "hevc_metadata"
|
.IX Subsection "hevc_metadata"
|
Modify metadata embedded in an \s-1HEVC\s0 stream.
|
.IP "\fBaud\fR" 4
|
.IX Item "aud"
|
Insert or remove \s-1AUD\s0 \s-1NAL\s0 units in all access units of the stream.
|
.RS 4
|
.IP "\fBinsert\fR" 4
|
.IX Item "insert"
|
.PD 0
|
.IP "\fBremove\fR" 4
|
.IX Item "remove"
|
.RE
|
.RS 4
|
.RE
|
.IP "\fBsample_aspect_ratio\fR" 4
|
.IX Item "sample_aspect_ratio"
|
.PD
|
Set the sample aspect ratio in the stream in the \s-1VUI\s0 parameters.
|
.IP "\fBvideo_format\fR" 4
|
.IX Item "video_format"
|
.PD 0
|
.IP "\fBvideo_full_range_flag\fR" 4
|
.IX Item "video_full_range_flag"
|
.PD
|
Set the video format in the stream (see H.265 section E.3.1 and
|
table E.2).
|
.IP "\fBcolour_primaries\fR" 4
|
.IX Item "colour_primaries"
|
.PD 0
|
.IP "\fBtransfer_characteristics\fR" 4
|
.IX Item "transfer_characteristics"
|
.IP "\fBmatrix_coefficients\fR" 4
|
.IX Item "matrix_coefficients"
|
.PD
|
Set the colour description in the stream (see H.265 section E.3.1
|
and tables E.3, E.4 and E.5).
|
.IP "\fBchroma_sample_loc_type\fR" 4
|
.IX Item "chroma_sample_loc_type"
|
Set the chroma sample location in the stream (see H.265 section
|
E.3.1 and figure E.1).
|
.IP "\fBtick_rate\fR" 4
|
.IX Item "tick_rate"
|
Set the tick rate in the \s-1VPS\s0 and \s-1VUI\s0 parameters (num_units_in_tick /
|
time_scale). Combined with \fBnum_ticks_poc_diff_one\fR, this can
|
set a constant framerate in the stream. Note that it is likely to be
|
overridden by container parameters when the stream is in a container.
|
.IP "\fBnum_ticks_poc_diff_one\fR" 4
|
.IX Item "num_ticks_poc_diff_one"
|
Set poc_proportional_to_timing_flag in \s-1VPS\s0 and \s-1VUI\s0 and use this value
|
to set num_ticks_poc_diff_one_minus1 (see H.265 sections 7.4.3.1 and
|
E.3.1). Ignored if \fBtick_rate\fR is not also set.
|
.IP "\fBcrop_left\fR" 4
|
.IX Item "crop_left"
|
.PD 0
|
.IP "\fBcrop_right\fR" 4
|
.IX Item "crop_right"
|
.IP "\fBcrop_top\fR" 4
|
.IX Item "crop_top"
|
.IP "\fBcrop_bottom\fR" 4
|
.IX Item "crop_bottom"
|
.PD
|
Set the conformance window cropping offsets in the \s-1SPS\s0. These values
|
will replace the current ones if the stream is already cropped.
|
.Sp
|
These fields are set in pixels. Note that some sizes may not be
|
representable if the chroma is subsampled (H.265 section 7.4.3.2.1).
|
.SS "hevc_mp4toannexb"
|
.IX Subsection "hevc_mp4toannexb"
|
Convert an \s-1HEVC/H\s0.265 bitstream from length prefixed mode to start code
|
prefixed mode (as defined in the Annex B of the ITU-T H.265
|
specification).
|
.PP
|
This is required by some streaming formats, typically the \s-1MPEG\-2\s0
|
transport stream format (muxer \f(CW\*(C`mpegts\*(C'\fR).
|
.PP
|
For example to remux an \s-1MP4\s0 file containing an \s-1HEVC\s0 stream to mpegts
|
format with \fBffmpeg\fR, you can use the command:
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT.mp4 \-codec copy \-bsf:v hevc_mp4toannexb OUTPUT.ts
|
.Ve
|
.PP
|
Please note that this filter is auto-inserted for MPEG-TS (muxer
|
\&\f(CW\*(C`mpegts\*(C'\fR) and raw \s-1HEVC/H\s0.265 (muxer \f(CW\*(C`h265\*(C'\fR or
|
\&\f(CW\*(C`hevc\*(C'\fR) output formats.
|
.SS "imxdump"
|
.IX Subsection "imxdump"
|
Modifies the bitstream to fit in \s-1MOV\s0 and to be usable by the Final Cut
|
Pro decoder. This filter only applies to the mpeg2video codec, and is
|
likely not needed for Final Cut Pro 7 and newer with the appropriate
|
\&\fB\-tag:v\fR.
|
.PP
|
For example, to remux 30 MB/sec \s-1NTSC\s0 \s-1IMX\s0 to \s-1MOV:\s0
|
.PP
|
.Vb 1
|
\& ffmpeg \-i input.mxf \-c copy \-bsf:v imxdump \-tag:v mx3n output.mov
|
.Ve
|
.SS "mjpeg2jpeg"
|
.IX Subsection "mjpeg2jpeg"
|
Convert \s-1MJPEG/AVI1\s0 packets to full \s-1JPEG/JFIF\s0 packets.
|
.PP
|
\&\s-1MJPEG\s0 is a video codec wherein each video frame is essentially a
|
\&\s-1JPEG\s0 image. The individual frames can be extracted without loss,
|
e.g. by
|
.PP
|
.Vb 1
|
\& ffmpeg \-i ../some_mjpeg.avi \-c:v copy frames_%d.jpg
|
.Ve
|
.PP
|
Unfortunately, these chunks are incomplete \s-1JPEG\s0 images, because
|
they lack the \s-1DHT\s0 segment required for decoding. Quoting from
|
<\fBhttp://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml\fR>:
|
.PP
|
Avery Lee, writing in the rec.video.desktop newsgroup in 2001,
|
commented that \*(L"\s-1MJPEG\s0, or at least the \s-1MJPEG\s0 in AVIs having the
|
\&\s-1MJPG\s0 fourcc, is restricted \s-1JPEG\s0 with a fixed \*(-- and *omitted* \*(--
|
Huffman table. The \s-1JPEG\s0 must be YCbCr colorspace, it must be 4:2:2,
|
and it must use basic Huffman encoding, not arithmetic or
|
progressive. . . . You can indeed extract the \s-1MJPEG\s0 frames and
|
decode them with a regular \s-1JPEG\s0 decoder, but you have to prepend
|
the \s-1DHT\s0 segment to them, or else the decoder won't have any idea
|
how to decompress the data. The exact table necessary is given in
|
the OpenDML spec.\*(R"
|
.PP
|
This bitstream filter patches the header of frames extracted from an \s-1MJPEG\s0
|
stream (carrying the \s-1AVI1\s0 header \s-1ID\s0 and lacking a \s-1DHT\s0 segment) to
|
produce fully qualified \s-1JPEG\s0 images.
|
.PP
|
.Vb 3
|
\& ffmpeg \-i mjpeg\-movie.avi \-c:v copy \-bsf:v mjpeg2jpeg frame_%d.jpg
|
\& exiftran \-i \-9 frame*.jpg
|
\& ffmpeg \-i frame_%d.jpg \-c:v copy rotated.avi
|
.Ve
|
.SS "mjpegadump"
|
.IX Subsection "mjpegadump"
|
Add an \s-1MJPEG\s0 A header to the bitstream, to enable decoding by
|
Quicktime.
|
.SS "mov2textsub"
|
.IX Subsection "mov2textsub"
|
Extract a representable text file from \s-1MOV\s0 subtitles, stripping the
|
metadata header from each subtitle packet.
|
.PP
|
See also the \fBtext2movsub\fR filter.
|
.SS "mp3decomp"
|
.IX Subsection "mp3decomp"
|
Decompress non-standard compressed \s-1MP3\s0 audio headers.
|
.SS "mpeg2_metadata"
|
.IX Subsection "mpeg2_metadata"
|
Modify metadata embedded in an \s-1MPEG\-2\s0 stream.
|
.IP "\fBdisplay_aspect_ratio\fR" 4
|
.IX Item "display_aspect_ratio"
|
Set the display aspect ratio in the stream.
|
.Sp
|
The following fixed values are supported:
|
.RS 4
|
.IP "\fB4/3\fR" 4
|
.IX Item "4/3"
|
.PD 0
|
.IP "\fB16/9\fR" 4
|
.IX Item "16/9"
|
.IP "\fB221/100\fR" 4
|
.IX Item "221/100"
|
.RE
|
.RS 4
|
.PD
|
.Sp
|
Any other value will result in square pixels being signalled instead
|
(see H.262 section 6.3.3 and table 6\-3).
|
.RE
|
.IP "\fBframe_rate\fR" 4
|
.IX Item "frame_rate"
|
Set the frame rate in the stream. This is constructed from a table
|
of known values combined with a small multiplier and divisor \- if
|
the supplied value is not exactly representable, the nearest
|
representable value will be used instead (see H.262 section 6.3.3
|
and table 6\-4).
|
.IP "\fBvideo_format\fR" 4
|
.IX Item "video_format"
|
Set the video format in the stream (see H.262 section 6.3.6 and
|
table 6\-6).
|
.IP "\fBcolour_primaries\fR" 4
|
.IX Item "colour_primaries"
|
.PD 0
|
.IP "\fBtransfer_characteristics\fR" 4
|
.IX Item "transfer_characteristics"
|
.IP "\fBmatrix_coefficients\fR" 4
|
.IX Item "matrix_coefficients"
|
.PD
|
Set the colour description in the stream (see H.262 section 6.3.6
|
and tables 6\-7, 6\-8 and 6\-9).
|
.SS "mpeg4_unpack_bframes"
|
.IX Subsection "mpeg4_unpack_bframes"
|
Unpack DivX-style packed B\-frames.
|
.PP
|
DivX-style packed B\-frames are not valid \s-1MPEG\-4\s0 and were only a
|
workaround for the broken Video for Windows subsystem.
|
They use more space, can cause minor \s-1AV\s0 sync issues, require more
|
\&\s-1CPU\s0 power to decode (unless the player has some decoded picture queue
|
to compensate the 2,0,2,0 frame per packet style) and cause
|
trouble if copied into a standard container like mp4 or mpeg\-ps/ts,
|
because \s-1MPEG\-4\s0 decoders may not be able to decode them, since they are
|
not valid \s-1MPEG\-4\s0.
|
.PP
|
For example to fix an \s-1AVI\s0 file containing an \s-1MPEG\-4\s0 stream with
|
DivX-style packed B\-frames using \fBffmpeg\fR, you can use the command:
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT.avi \-codec copy \-bsf:v mpeg4_unpack_bframes OUTPUT.avi
|
.Ve
|
.SS "noise"
|
.IX Subsection "noise"
|
Damages the contents of packets or simply drops them without damaging the
|
container. Can be used for fuzzing or testing error resilience/concealment.
|
.PP
|
Parameters:
|
.IP "\fBamount\fR" 4
|
.IX Item "amount"
|
A numeral string, whose value is related to how often output bytes will
|
be modified. Therefore, values below or equal to 0 are forbidden, and
|
the lower the more frequent bytes will be modified, with 1 meaning
|
every byte is modified.
|
.IP "\fBdropamount\fR" 4
|
.IX Item "dropamount"
|
A numeral string, whose value is related to how often packets will be dropped.
|
Therefore, values below or equal to 0 are forbidden, and the lower the more
|
frequent packets will be dropped, with 1 meaning every packet is dropped.
|
.PP
|
The following example applies the modification to every byte but does not drop
|
any packets.
|
.PP
|
.Vb 1
|
\& ffmpeg \-i INPUT \-c copy \-bsf noise[=1] output.mkv
|
.Ve
|
.SS "null"
|
.IX Subsection "null"
|
This bitstream filter passes the packets through unchanged.
|
.SS "remove_extra"
|
.IX Subsection "remove_extra"
|
Remove extradata from packets.
|
.PP
|
It accepts the following parameter:
|
.IP "\fBfreq\fR" 4
|
.IX Item "freq"
|
Set which frame types to remove extradata from.
|
.RS 4
|
.IP "\fBk\fR" 4
|
.IX Item "k"
|
Remove extradata from non-keyframes only.
|
.IP "\fBkeyframe\fR" 4
|
.IX Item "keyframe"
|
Remove extradata from keyframes only.
|
.IP "\fBe, all\fR" 4
|
.IX Item "e, all"
|
Remove extradata from all frames.
|
.RE
|
.RS 4
|
.RE
|
.SS "text2movsub"
|
.IX Subsection "text2movsub"
|
Convert text subtitles to \s-1MOV\s0 subtitles (as used by the \f(CW\*(C`mov_text\*(C'\fR
|
codec) with metadata headers.
|
.PP
|
See also the \fBmov2textsub\fR filter.
|
.SS "trace_headers"
|
.IX Subsection "trace_headers"
|
Log trace output containing all syntax elements in the coded stream
|
headers (everything above the level of individual coded blocks).
|
This can be useful for debugging low-level stream issues.
|
.PP
|
Supports H.264, H.265, \s-1MPEG\-2\s0 and \s-1VP9\s0.
|
.SS "vp9_metadata"
|
.IX Subsection "vp9_metadata"
|
Modify metadata embedded in a \s-1VP9\s0 stream.
|
.IP "\fBcolor_space\fR" 4
|
.IX Item "color_space"
|
Set the color space value in the frame header.
|
.RS 4
|
.IP "\fBunknown\fR" 4
|
.IX Item "unknown"
|
.PD 0
|
.IP "\fBbt601\fR" 4
|
.IX Item "bt601"
|
.IP "\fBbt709\fR" 4
|
.IX Item "bt709"
|
.IP "\fBsmpte170\fR" 4
|
.IX Item "smpte170"
|
.IP "\fBsmpte240\fR" 4
|
.IX Item "smpte240"
|
.IP "\fBbt2020\fR" 4
|
.IX Item "bt2020"
|
.IP "\fBrgb\fR" 4
|
.IX Item "rgb"
|
.RE
|
.RS 4
|
.RE
|
.IP "\fBcolor_range\fR" 4
|
.IX Item "color_range"
|
.PD
|
Set the color range value in the frame header. Note that this cannot
|
be set in \s-1RGB\s0 streams.
|
.RS 4
|
.IP "\fBtv\fR" 4
|
.IX Item "tv"
|
.PD 0
|
.IP "\fBpc\fR" 4
|
.IX Item "pc"
|
.RE
|
.RS 4
|
.RE
|
.PD
|
.SS "vp9_superframe"
|
.IX Subsection "vp9_superframe"
|
Merge \s-1VP9\s0 invisible (alt-ref) frames back into \s-1VP9\s0 superframes. This
|
fixes merging of split/segmented \s-1VP9\s0 streams where the alt-ref frame
|
was split from its visible counterpart.
|
.SS "vp9_superframe_split"
|
.IX Subsection "vp9_superframe_split"
|
Split \s-1VP9\s0 superframes into single frames.
|
.SS "vp9_raw_reorder"
|
.IX Subsection "vp9_raw_reorder"
|
Given a \s-1VP9\s0 stream with correct timestamps but possibly out of order,
|
insert additional show-existing-frame packets to correct the ordering.
|
.SH "SEE ALSO"
|
.IX Header "SEE ALSO"
|
\&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIlibavcodec\fR\|(3)
|
.SH "AUTHORS"
|
.IX Header "AUTHORS"
|
The FFmpeg developers.
|
.PP
|
For details about the authorship, see the Git history of the project
|
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
|
\&\fBgit log\fR in the FFmpeg source directory, or browsing the
|
online repository at <\fBhttp://source.ffmpeg.org\fR>.
|
.PP
|
Maintainers for the specific components are listed in the file
|
\&\fI\s-1MAINTAINERS\s0\fR in the source code tree.
|
