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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 |
| | | .\" way too many mistakes in technical documents. |
| | | .if n .ad l |
| | | .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. |