Provided by: ffmpeg_6.1.1-3ubuntu5_amd64 bug

NAME

       ffmpeg-bitstream-filters - FFmpeg bitstream filters

DESCRIPTION

       This document describes the bitstream filters provided by the libavcodec library.

       A bitstream filter operates on the encoded stream data, and performs bitstream level modifications
       without performing decoding.

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 "--list-bsfs".

       You can disable all the bitstream filters using the configure option "--disable-bsfs", and selectively
       enable any bitstream filter using the option "--enable-bsf=BSF", or you can disable a particular
       bitstream filter using the option "--disable-bsf=BSF".

       The option "-bsfs" of the ff* tools will display the list of all the supported bitstream filters included
       in your build.

       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 '='.

               ffmpeg -i INPUT -c:v copy -bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT

       Below is a description of the currently available bitstream filters, with their parameters, if any.

   aac_adtstoasc
       Convert MPEG-2/4 AAC ADTS to an MPEG-4 Audio Specific Configuration bitstream.

       This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4 ADTS header and removes the ADTS
       header.

       This filter is required for example when copying an AAC stream from a raw ADTS AAC or an MPEG-TS
       container to MP4A-LATM, to an FLV file, or to MOV/MP4 files and related formats such as 3GP or M4A.
       Please note that it is auto-inserted for MP4A-LATM and MOV/MP4 and related formats.

   av1_metadata
       Modify metadata embedded in an AV1 stream.

       td  Insert or remove temporal delimiter OBUs in all temporal units of the stream.

           insert
               Insert a TD at the beginning of every TU which does not already have one.

           remove
               Remove the TD from the beginning of every TU which has one.

       color_primaries
       transfer_characteristics
       matrix_coefficients
           Set the color description fields in the stream (see AV1 section 6.4.2).

       color_range
           Set  the  color  range in the stream (see AV1 section 6.4.2; note that this cannot be set for streams
           using BT.709 primaries, sRGB transfer characteristic and identity (RGB) matrix coefficients).

           tv  Limited range.

           pc  Full range.

       chroma_sample_position
           Set the chroma sample location in the stream (see AV1 section 6.4.2).  This can only be set for 4:2:0
           streams.

           vertical
               Left position (matching the default in MPEG-2 and H.264).

           colocated
               Top-left position.

       tick_rate
           Set the tick rate (time_scale / num_units_in_display_tick) in the timing info in the sequence header.

       num_ticks_per_picture
           Set the number of ticks in each picture, to indicate that the stream has a fixed framerate.   Ignored
           if tick_rate is not also set.

       delete_padding
           Deletes Padding OBUs.

   chomp
       Remove zero padding at the end of a packet.

   dca_core
       Extract the core from a DCA/DTS stream, dropping extensions such as DTS-HD.

   dump_extra
       Add  extradata  to  the  beginning of the filtered packets except when said packets already exactly begin
       with the extradata that is intended to be added.

       freq
           The additional argument specifies which packets should be filtered.  It accepts the values:

           k
           keyframe
               add extradata to all key packets

           e
           all add extradata to all packets

       If not specified it is assumed k.

       For example the following ffmpeg command  forces  a  global  header  (thus  disabling  individual  packet
       headers)  in the H.264 packets generated by the "libx264" encoder, but corrects them by adding the header
       stored in extradata to the key packets:

               ffmpeg -i INPUT -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra out.ts

   dv_error_marker
       Blocks in DV which are marked as damaged are replaced by blocks of the specified color.

       color
           The color to replace damaged blocks by

       sta A 16 bit mask which specifies which of the 16 possible error status values  are  to  be  replaced  by
           colored blocks. 0xFFFE is the default which replaces all non 0 error status values.

           ok  No error, no concealment

           err Error, No concealment

           res Reserved

           notok
               Error or concealment

           notres
               Not reserved

           Aa, Ba, Ca, Ab, Bb, Cb, A, B, C, a, b, erri, erru
               The specific error status code

           see             page             44-46             or            section            5.5            of
           <http://web.archive.org/web/20060927044735/http://www.smpte.org/smpte_store/standards/pdf/s314m.pdf>

   eac3_core
       Extract the core from a E-AC-3 stream, dropping extra channels.

   extract_extradata
       Extract the in-band extradata.

       Certain codecs allow the long-term headers (e.g. MPEG-2 sequence headers, or H.264/HEVC (VPS/)SPS/PPS) to
       be transmitted either "in-band" (i.e. as a part of the bitstream containing the coded frames) or "out  of
       band" (e.g. on the container level). This latter form is called "extradata" in FFmpeg terminology.

       This bitstream filter detects the in-band headers and makes them available as extradata.

       remove
           When this option is enabled, the long-term headers are removed from the bitstream after extraction.

   filter_units
       Remove units with types in or not in a given set from the stream.

       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 '-'.

       remove_types
           Identical to pass_types, except the units in the given set removed and all others passed through.

       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.

       For example, to remove all non-VCL NAL units from an H.264 stream:

               ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=pass_types=1-5' OUTPUT

       To remove all AUDs, SEI and filler from an H.265 stream:

               ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT

   hapqa_extract
       Extract Rgb or Alpha part of an HAPQA file, without recompression, in order  to  create  an  HAPQ  or  an
       HAPAlphaOnly file.

       texture
           Specifies the texture to keep.

           color
           alpha

       Convert HAPQA to HAPQ

               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

       Convert HAPQA to HAPAlphaOnly

               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

   h264_metadata
       Modify metadata embedded in an H.264 stream.

       aud Insert or remove AUD NAL units in all access units of the stream.

           pass
           insert
           remove

           Default is pass.

       sample_aspect_ratio
           Set the sample aspect ratio of the stream in the VUI parameters.  See H.264 table E-1.

       overscan_appropriate_flag
           Set whether the stream is suitable for display using overscan or not (see H.264 section E.2.1).

       video_format
       video_full_range_flag
           Set the video format in the stream (see H.264 section E.2.1 and table E-2).

       colour_primaries
       transfer_characteristics
       matrix_coefficients
           Set the colour description in the stream (see H.264 section E.2.1 and tables E-3, E-4 and E-5).

       chroma_sample_loc_type
           Set the chroma sample location in the stream (see H.264 section E.2.1 and figure E-1).

       tick_rate
           Set  the tick rate (time_scale / num_units_in_tick) in the VUI 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).

       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).

       zero_new_constraint_set_flags
           Zero constraint_set4_flag and constraint_set5_flag in the SPS. These bits were reserved in a previous
           version  of  the  H.264 spec, and thus some hardware decoders require these to be zero. The result of
           zeroing this is still a valid bitstream.

       crop_left
       crop_right
       crop_top
       crop_bottom
           Set the frame cropping offsets in the SPS.  These values will replace the current ones if the  stream
           is already cropped.

           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).

       sei_user_data
           Insert a string as SEI unregistered user data.  The argument must be of the form  UUID+string,  where
           the UUID is as hex digits possibly separated by hyphens, and the string can be anything.

           For  example,  086f3693-b7b3-4f2c-9653-21492feee5b8+hello will insert the string ``hello'' associated
           with the given UUID.

       delete_filler
           Deletes both filler NAL units and filler SEI messages.

       display_orientation
           Insert, extract or remove Display orientation SEI messages.  See H.264 section D.1.27 and D.2.27  for
           syntax and semantics.

           pass
           insert
           remove
           extract

           Default is pass.

           Insert  mode  works  in  conjunction  with  "rotate"  and  "flip"  options.  Any pre-existing Display
           orientation messages will be removed in insert or remove mode.  Extract  mode  attaches  the  display
           matrix to the packet as side data.

       rotate
           Set  rotation  in  display  orientation SEI (anticlockwise angle in degrees).  Range is -360 to +360.
           Default is NaN.

       flip
           Set flip in display orientation SEI.

           horizontal
           vertical

           Default is unset.

       level
           Set the level in the SPS.  Refer to H.264 section A.3 and tables A-1 to A-5.

           The argument must be the name of a level (for example, 4.2), a level_idc value (for example, 42),  or
           the  special  name  auto  indicating that the filter should attempt to guess the level from the input
           stream properties.

   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).

       This is required by  some  streaming  formats,  typically  the  MPEG-2  transport  stream  format  (muxer
       "mpegts").

       For example to remux an MP4 file containing an H.264 stream to mpegts format with ffmpeg, you can use the
       command:

               ffmpeg -i INPUT.mp4 -codec copy -bsf:v h264_mp4toannexb OUTPUT.ts

       Please  note  that this filter is auto-inserted for MPEG-TS (muxer "mpegts") and raw H.264 (muxer "h264")
       output formats.

   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.

   hevc_metadata
       Modify metadata embedded in an HEVC stream.

       aud Insert or remove AUD NAL units in all access units of the stream.

           insert
           remove
       sample_aspect_ratio
           Set the sample aspect ratio in the stream in the VUI parameters.

       video_format
       video_full_range_flag
           Set the video format in the stream (see H.265 section E.3.1 and table E.2).

       colour_primaries
       transfer_characteristics
       matrix_coefficients
           Set the colour description in the stream (see H.265 section E.3.1 and tables E.3, E.4 and E.5).

       chroma_sample_loc_type
           Set the chroma sample location in the stream (see H.265 section E.3.1 and figure E.1).

       tick_rate
           Set  the  tick  rate  in  the  VPS and VUI parameters (time_scale / num_units_in_tick). Combined with
           num_ticks_poc_diff_one, 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.

       num_ticks_poc_diff_one
           Set    poc_proportional_to_timing_flag    in    VPS   and   VUI   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  tick_rate  is  not
           also set.

       crop_left
       crop_right
       crop_top
       crop_bottom
           Set  the  conformance window cropping offsets in the SPS.  These values will replace the current ones
           if the stream is already cropped.

           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).

       level
           Set the level in the VPS and SPS.  See H.265 section A.4 and tables A.6 and A.7.

           The  argument must be the name of a level (for example, 5.1), a general_level_idc value (for example,
           153 for level 5.1), or the special name auto indicating that the filter should attempt to  guess  the
           level from the input stream properties.

   hevc_mp4toannexb
       Convert  an HEVC/H.265 bitstream from length prefixed mode to start code prefixed mode (as defined in the
       Annex B of the ITU-T H.265 specification).

       This is required by  some  streaming  formats,  typically  the  MPEG-2  transport  stream  format  (muxer
       "mpegts").

       For  example to remux an MP4 file containing an HEVC stream to mpegts format with ffmpeg, you can use the
       command:

               ffmpeg -i INPUT.mp4 -codec copy -bsf:v hevc_mp4toannexb OUTPUT.ts

       Please note that this filter is auto-inserted for MPEG-TS (muxer  "mpegts")  and  raw  HEVC/H.265  (muxer
       "h265" or "hevc") output formats.

   imxdump
       Modifies  the  bitstream  to  fit  in MOV 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 -tag:v.

       For example, to remux 30 MB/sec NTSC IMX to MOV:

               ffmpeg -i input.mxf -c copy -bsf:v imxdump -tag:v mx3n output.mov

   mjpeg2jpeg
       Convert MJPEG/AVI1 packets to full JPEG/JFIF packets.

       MJPEG is a video codec wherein each video frame is essentially a JPEG image. The individual frames can be
       extracted without loss, e.g. by

               ffmpeg -i ../some_mjpeg.avi -c:v copy frames_%d.jpg

       Unfortunately,  these  chunks  are incomplete JPEG images, because they lack the DHT segment required for
       decoding. Quoting from <http://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml>:

       Avery Lee, writing in the rec.video.desktop newsgroup in 2001, commented that "MJPEG,  or  at  least  the
       MJPEG  in AVIs having the MJPG fourcc, is restricted JPEG with a fixed -- and *omitted* -- Huffman table.
       The JPEG 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 MJPEG frames and decode them with a regular
       JPEG decoder, but you have to prepend the DHT 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."

       This  bitstream  filter  patches  the  header of frames extracted from an MJPEG stream (carrying the AVI1
       header ID and lacking a DHT segment) to produce fully qualified JPEG images.

               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

   mjpegadump
       Add an MJPEG A header to the bitstream, to enable decoding by Quicktime.

   mov2textsub
       Extract a representable text file from MOV subtitles, stripping the metadata header  from  each  subtitle
       packet.

       See also the text2movsub filter.

   mp3decomp
       Decompress non-standard compressed MP3 audio headers.

   mpeg2_metadata
       Modify metadata embedded in an MPEG-2 stream.

       display_aspect_ratio
           Set the display aspect ratio in the stream.

           The following fixed values are supported:

           4/3
           16/9
           221/100

           Any  other  value  will  result in square pixels being signalled instead (see H.262 section 6.3.3 and
           table 6-3).

       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).

       video_format
           Set the video format in the stream (see H.262 section 6.3.6 and table 6-6).

       colour_primaries
       transfer_characteristics
       matrix_coefficients
           Set the colour description in the stream (see H.262 section 6.3.6 and tables 6-7, 6-8 and 6-9).

   mpeg4_unpack_bframes
       Unpack DivX-style packed B-frames.

       DivX-style packed B-frames are not valid MPEG-4 and were only a  workaround  for  the  broken  Video  for
       Windows subsystem.  They use more space, can cause minor AV sync issues, require more CPU 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 MPEG-4 decoders may not
       be able to decode them, since they are not valid MPEG-4.

       For example to fix an AVI file containing an MPEG-4 stream with DivX-style packed B-frames using  ffmpeg,
       you can use the command:

               ffmpeg -i INPUT.avi -codec copy -bsf:v mpeg4_unpack_bframes OUTPUT.avi

   noise
       Damages  the  contents  of  packets  or simply drops them without damaging the container. Can be used for
       fuzzing or testing error resilience/concealment.

       Parameters:

       amount
           Accepts an expression whose evaluation per-packet determines how often bytes in that packet  will  be
           modified.  A  value  below  0  will result in a variable frequency.  Default is 0 which results in no
           modification. However, if neither amount nor drop is specified, amount will be set to -1.  See  below
           for accepted variables.

       drop
           Accepts  an  expression  evaluated  per-packet whose value determines whether that packet is dropped.
           Evaluation to a positive value results in the packet being dropped. Evaluation to  a  negative  value
           results  in  a variable chance of it being dropped, roughly inverse in proportion to the magnitude of
           the value. Default is 0 which results in no drops. See below for accepted variables.

       dropamount
           Accepts a non-negative integer, which assigns a variable chance of it being dropped, roughly  inverse
           in proportion to the value. Default is 0 which results in no drops. This option is kept for backwards
           compatibility  and  is  equivalent  to  setting drop to a negative value with the same magnitude i.e.
           "dropamount=4" is the same as "drop=-4". Ignored if drop is also specified.

       Both "amount" and "drop" accept expressions containing the following variables:

       n   The index of the packet, starting from zero.

       tb  The timebase for packet timestamps.

       pts Packet presentation timestamp.

       dts Packet decoding timestamp.

       nopts
           Constant representing AV_NOPTS_VALUE.

       startpts
           First non-AV_NOPTS_VALUE PTS seen in the stream.

       startdts
           First non-AV_NOPTS_VALUE DTS seen in the stream.

       duration
       d   Packet duration, in timebase units.

       pos Packet position in input; may be -1 when unknown or not set.

       size
           Packet size, in bytes.

       key Whether packet is marked as a keyframe.

       state
           A pseudo random integer, primarily derived from the content of packet payload.

       Examples

       Apply modification to every byte but don't drop any packets.

               ffmpeg -i INPUT -c copy -bsf noise=1 output.mkv

       Drop every video packet not marked as a keyframe after timestamp  30s  but  do  not  modify  any  of  the
       remaining packets.

               ffmpeg -i INPUT -c copy -bsf:v noise=drop='gt(t\,30)*not(key)' output.mkv

       Drop one second of audio every 10 seconds and add some random noise to the rest.

               ffmpeg -i INPUT -c copy -bsf:a noise=amount=-1:drop='between(mod(t\,10)\,9\,10)' output.mkv

   null
       This bitstream filter passes the packets through unchanged.

   pcm_rechunk
       Repacketize  PCM audio to a fixed number of samples per packet or a fixed packet rate per second. This is
       similar to the asetnsamples audio filter but works on audio packets instead of audio frames.

       nb_out_samples, n
           Set the number of samples per each output audio packet. The number  is  intended  as  the  number  of
           samples per each channel. Default value is 1024.

       pad, p
           If set to 1, the filter will pad the last audio packet with silence, so that it will contain the same
           number  of  samples  (or  roughly  the  same number of samples, see frame_rate) as the previous ones.
           Default value is 1.

       frame_rate, r
           This option makes the filter output a fixed number of packets per second instead of a fixed number of
           samples per packet. If the audio sample rate is not divisible by the frame rate then  the  number  of
           samples  will  not  be constant but will vary slightly so that each packet will start as close to the
           frame boundary as possible. Using this option has precedence over nb_out_samples.

       You can generate the well known 1602-1601-1602-1601-1602 pattern of 48kHz audio for NTSC frame rate using
       the frame_rate option.

               ffmpeg -f lavfi -i sine=r=48000:d=1 -c pcm_s16le -bsf pcm_rechunk=r=30000/1001 -f framecrc -

   pgs_frame_merge
       Merge a sequence of PGS Subtitle segments ending with an "end of  display  set"  segment  into  a  single
       packet.

       This is required by some containers that support PGS subtitles (muxer "matroska").

   prores_metadata
       Modify color property metadata embedded in prores stream.

       color_primaries
           Set the color primaries.  Available values are:

           auto
               Keep the same color primaries property (default).

           unknown
           bt709
           bt470bg
               BT601 625

           smpte170m
               BT601 525

           bt2020
           smpte431
               DCI P3

           smpte432
               P3 D65

       transfer_characteristics
           Set the color transfer.  Available values are:

           auto
               Keep the same transfer characteristics property (default).

           unknown
           bt709
               BT 601, BT 709, BT 2020

           smpte2084
               SMPTE ST 2084

           arib-std-b67
               ARIB STD-B67

       matrix_coefficients
           Set the matrix coefficient.  Available values are:

           auto
               Keep the same colorspace property (default).

           unknown
           bt709
           smpte170m
               BT 601

           bt2020nc

       Set Rec709 colorspace for each frame of the file

               ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709 output.mov

       Set Hybrid Log-Gamma parameters for each frame of the file

               ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt2020:color_trc=arib-std-b67:colorspace=bt2020nc output.mov

   remove_extra
       Remove extradata from packets.

       It accepts the following parameter:

       freq
           Set which frame types to remove extradata from.

           k   Remove extradata from non-keyframes only.

           keyframe
               Remove extradata from keyframes only.

           e, all
               Remove extradata from all frames.

   setts
       Set PTS and DTS in packets.

       It accepts the following parameters:

       ts
       pts
       dts Set expressions for PTS, DTS or both.

       duration
           Set expression for duration.

       time_base
           Set output time base.

       The expressions are evaluated through the eval API and can contain the following constants:

       N   The count of the input packet. Starting from 0.

       TS  The  demux  timestamp  in  input in case of "ts" or "dts" option or presentation timestamp in case of
           "pts" option.

       POS The original position in the file of the packet, or undefined if undefined for the current packet

       DTS The demux timestamp in input.

       PTS The presentation timestamp in input.

       DURATION
           The duration in input.

       STARTDTS
           The DTS of the first packet.

       STARTPTS
           The PTS of the first packet.

       PREV_INDTS
           The previous input DTS.

       PREV_INPTS
           The previous input PTS.

       PREV_INDURATION
           The previous input duration.

       PREV_OUTDTS
           The previous output DTS.

       PREV_OUTPTS
           The previous output PTS.

       PREV_OUTDURATION
           The previous output duration.

       NEXT_DTS
           The next input DTS.

       NEXT_PTS
           The next input PTS.

       NEXT_DURATION
           The next input duration.

       TB  The timebase of stream packet belongs.

       TB_OUT
           The output timebase.

       SR  The sample rate of stream packet belongs.

       NOPTS
           The AV_NOPTS_VALUE constant.

   text2movsub
       Convert text subtitles to MOV subtitles (as used by the "mov_text" codec) with metadata headers.

       See also the mov2textsub filter.

   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.

       Supports  AV1,  H.264,  H.265, (M)JPEG, MPEG-2 and VP9, but depending on the build only a subset of these
       may be available.

   truehd_core
       Extract the core from a TrueHD stream, dropping ATMOS data.

   vp9_metadata
       Modify metadata embedded in a VP9 stream.

       color_space
           Set the color space value in the frame header.  Note that any frame set to RGB will be implicitly set
           to PC range and that RGB is incompatible with profiles 0 and 2.

           unknown
           bt601
           bt709
           smpte170
           smpte240
           bt2020
           rgb
       color_range
           Set the color range value in the frame header.  Note that any value imposed by the color  space  will
           take precedence over this value.

           tv
           pc

   vp9_superframe
       Merge VP9 invisible (alt-ref) frames back into VP9 superframes. This fixes merging of split/segmented VP9
       streams where the alt-ref frame was split from its visible counterpart.

   vp9_superframe_split
       Split VP9 superframes into single frames.

   vp9_raw_reorder
       Given  a  VP9  stream with correct timestamps but possibly out of order, insert additional show-existing-
       frame packets to correct the ordering.

SEE ALSO

       ffmpeg(1), ffplay(1), ffprobe(1), libavcodec(3)

AUTHORS

       The FFmpeg developers.

       For details about the authorship, see the Git history  of  the  project  (https://git.ffmpeg.org/ffmpeg),
       e.g.  by  typing the command git log in the FFmpeg source directory, or browsing the online repository at
       <https://git.ffmpeg.org/ffmpeg>.

       Maintainers for the specific components are listed in the file MAINTAINERS in the source code tree.

                                                                                     FFMPEG-BITSTREAM-FILTERS(1)