forked from KolibriOS/kolibrios
754f9336f0
git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60
276 lines
9.2 KiB
Groff
276 lines
9.2 KiB
Groff
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
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.\" ========================================================================
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.\"
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.IX Title "FFMPEG-BITSTREAM-FILTERS 1"
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.TH FFMPEG-BITSTREAM-FILTERS 1 "2013-12-14" " " " "
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.SH "NAME"
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ffmpeg\-bitstream\-filters \- FFmpeg bitstream filters
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This document describes the bitstream filters provided by the
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libavcodec library.
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.PP
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A bitstream filter operates on the encoded stream data, and performs
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bitstream level modifications without performing decoding.
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.SH "BITSTREAM FILTERS"
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.IX Header "BITSTREAM FILTERS"
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When you configure your FFmpeg build, all the supported bitstream
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filters are enabled by default. You can list all available ones using
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the configure option \f(CW\*(C`\-\-list\-bsfs\*(C'\fR.
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.PP
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You can disable all the bitstream filters using the configure option
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\&\f(CW\*(C`\-\-disable\-bsfs\*(C'\fR, and selectively enable any bitstream filter using
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the option \f(CW\*(C`\-\-enable\-bsf=BSF\*(C'\fR, or you can disable a particular
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bitstream filter using the option \f(CW\*(C`\-\-disable\-bsf=BSF\*(C'\fR.
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.PP
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The option \f(CW\*(C`\-bsfs\*(C'\fR of the ff* tools will display the list of
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all the supported bitstream filters included in your build.
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.PP
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Below is a description of the currently available bitstream filters.
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.Sh "aac_adtstoasc"
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.IX Subsection "aac_adtstoasc"
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Convert \s-1MPEG\-2/4\s0 \s-1AAC\s0 \s-1ADTS\s0 to \s-1MPEG\-4\s0 Audio Specific Configuration
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bitstream filter.
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.PP
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This filter creates an \s-1MPEG\-4\s0 AudioSpecificConfig from an \s-1MPEG\-2/4\s0
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\&\s-1ADTS\s0 header and removes the \s-1ADTS\s0 header.
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.PP
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This is required for example when copying an \s-1AAC\s0 stream from a raw
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\&\s-1ADTS\s0 \s-1AAC\s0 container to a \s-1FLV\s0 or a \s-1MOV/MP4\s0 file.
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.Sh "chomp"
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.IX Subsection "chomp"
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Remove zero padding at the end of a packet.
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.Sh "dump_extra"
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.IX Subsection "dump_extra"
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Add extradata to the beginning of the filtered packets.
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.PP
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The additional argument specifies which packets should be filtered.
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It accepts the values:
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.IP "\fBa\fR" 4
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.IX Item "a"
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add extradata to all key packets, but only if \fIlocal_header\fR is
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set in the \fBflags2\fR codec context field
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.IP "\fBk\fR" 4
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.IX Item "k"
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add extradata to all key packets
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.IP "\fBe\fR" 4
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.IX Item "e"
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add extradata to all packets
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.PP
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If not specified it is assumed \fBk\fR.
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.PP
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For example the following \fBffmpeg\fR command forces a global
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header (thus disabling individual packet headers) in the H.264 packets
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generated by the \f(CW\*(C`libx264\*(C'\fR encoder, but corrects them by adding
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the header stored in extradata to the key packets:
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.PP
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.Vb 1
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\& ffmpeg -i INPUT -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra out.ts
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.Ve
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.Sh "h264_mp4toannexb"
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.IX Subsection "h264_mp4toannexb"
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Convert an H.264 bitstream from length prefixed mode to start code
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prefixed mode (as defined in the Annex B of the ITU-T H.264
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specification).
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.PP
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This is required by some streaming formats, typically the \s-1MPEG\-2\s0
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transport stream format (\*(L"mpegts\*(R").
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.PP
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For example to remux an \s-1MP4\s0 file containing an H.264 stream to mpegts
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format with \fBffmpeg\fR, you can use the command:
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.PP
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.Vb 1
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\& ffmpeg -i INPUT.mp4 -codec copy -bsf:v h264_mp4toannexb OUTPUT.ts
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.Ve
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.Sh "imx_dump_header"
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.IX Subsection "imx_dump_header"
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.Sh "mjpeg2jpeg"
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.IX Subsection "mjpeg2jpeg"
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Convert \s-1MJPEG/AVI1\s0 packets to full \s-1JPEG/JFIF\s0 packets.
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.PP
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\&\s-1MJPEG\s0 is a video codec wherein each video frame is essentially a
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\&\s-1JPEG\s0 image. The individual frames can be extracted without loss,
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e.g. by
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.PP
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.Vb 1
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\& ffmpeg -i ../some_mjpeg.avi -c:v copy frames_%d.jpg
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.Ve
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.PP
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Unfortunately, these chunks are incomplete \s-1JPEG\s0 images, because
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they lack the \s-1DHT\s0 segment required for decoding. Quoting from
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<\fBhttp://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml\fR>:
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.PP
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Avery Lee, writing in the rec.video.desktop newsgroup in 2001,
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commented that \*(L"\s-1MJPEG\s0, or at least the \s-1MJPEG\s0 in AVIs having the
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\&\s-1MJPG\s0 fourcc, is restricted \s-1JPEG\s0 with a fixed \*(-- and *omitted* \*(--
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Huffman table. The \s-1JPEG\s0 must be YCbCr colorspace, it must be 4:2:2,
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and it must use basic Huffman encoding, not arithmetic or
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progressive. . . . You can indeed extract the \s-1MJPEG\s0 frames and
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decode them with a regular \s-1JPEG\s0 decoder, but you have to prepend
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the \s-1DHT\s0 segment to them, or else the decoder won't have any idea
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how to decompress the data. The exact table necessary is given in
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the OpenDML spec.\*(R"
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.PP
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This bitstream filter patches the header of frames extracted from an \s-1MJPEG\s0
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stream (carrying the \s-1AVI1\s0 header \s-1ID\s0 and lacking a \s-1DHT\s0 segment) to
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produce fully qualified \s-1JPEG\s0 images.
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.PP
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.Vb 3
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\& ffmpeg -i mjpeg-movie.avi -c:v copy -bsf:v mjpeg2jpeg frame_%d.jpg
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\& exiftran -i -9 frame*.jpg
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\& ffmpeg -i frame_%d.jpg -c:v copy rotated.avi
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.Ve
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.Sh "mjpega_dump_header"
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.IX Subsection "mjpega_dump_header"
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.Sh "movsub"
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.IX Subsection "movsub"
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.Sh "mp3_header_compress"
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.IX Subsection "mp3_header_compress"
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.Sh "mp3_header_decompress"
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.IX Subsection "mp3_header_decompress"
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.Sh "noise"
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.IX Subsection "noise"
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.Sh "remove_extra"
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.IX Subsection "remove_extra"
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIffserver\fR\|(1), \fIlibavcodec\fR\|(3)
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.SH "AUTHORS"
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.IX Header "AUTHORS"
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The FFmpeg developers.
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.PP
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For details about the authorship, see the Git history of the project
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(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
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\&\fBgit log\fR in the FFmpeg source directory, or browsing the
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online repository at <\fBhttp://source.ffmpeg.org\fR>.
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.PP
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Maintainers for the specific components are listed in the file
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\&\fI\s-1MAINTAINERS\s0\fR in the source code tree.
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