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KVAZAAR(1) User Commands KVAZAAR(1) NAME kvazaar - open source HEVC encoder SYNOPSIS kvazaar -i <input> --input-res <width>x<height> -o <output> DESCRIPTION Required: -i, --input <filename> Input file --input-res <res> Input resolution [auto] - auto: Detect from file name. - <int>x<int>: width times height -o, --output <filename> Output file Presets: --preset <preset> Set options to a preset [medium] - ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow placebo Input: -n, --frames <integer> Number of frames to code [all] --seek <integer> First frame to code [0] --input-fps <num>[/<denom>] Frame rate of the input video [25] --source-scan-type <string> Source scan type [progressive] - progressive: Progressive scan - tff: Top field first - bff: Bottom field first --input-format <string> P420 or P400 [P420] --input-bitdepth <int> 8-16 [8] --loop-input Re-read input file forever. --input-file-format <string> Input file format [auto] - auto: Check the file ending for format - y4m (skips frame headers) - yuv Options: --help Print this help message and exit. --version Print version information and exit. --(no-)aud Use access unit delimiters. [disabled] --debug <filename> Output internal reconstruction. --(no-)cpuid Enable runtime CPU optimizations. [enabled] --hash <string> Decoded picture hash [checksum] - none: 0 bytes - checksum: 18 bytes - md5: 56 bytes --(no-)psnr Calculate PSNR for frames. [enabled] --(no-)info Add encoder info SEI. [enabled] --(no-)enable-logging Enable logging for regular encoder performance, error messages are always disblayed. [enabled] --crypto <string> Selective encryption. Crypto support must be enabled at com- pile-time. Can be 'on' or 'off' or a list of features separated with a '+'. [off] - on: Enable all encryption features. - off: Disable selective encryption. - mvs: Motion vector magnitudes. - mv_signs: Motion vector signs. - trans_coeffs: Coefficient magnitudes. - trans_coeff_signs: Coefficient signs. - intra_pred_modes: Intra prediction modes. --key <string> Encryption key [16,213,27,56,255,127,242,112, 97,126,197,204,25,59,38,30] --stats-file-prefix A prefix used for stats files that include bits, lambda, distor- tion, and qp for each ctu. These are meant for debugging and are not written unless the prefix is defined. Video structure: -q, --qp <integer> Quantization parameter [22] -p, --period <integer> Period of intra pictures [64] - 0: Only first picture is intra. - 1: All pictures are intra. - N: Every Nth picture is intra. --vps-period <integer> How often the video parameter set is re-sent [0] - 0: Only send VPS with the first frame. - N: Send VPS with every Nth intra frame. -r, --ref <integer> Number of reference frames, in range 1..15 [4] --gop <string> GOP structure [16] - 0: Disabled - 8: B-frame pyramid of length 8 - 16: B-frame pyramid of length 16 - lp-<string>: Low-delay P/B-frame GOP (e.g. lp-g8d4t2, see README) --intra-qp-offset <int>: QP offset for intra frames [-51..51] [auto] - N: Set QP offset to N. - auto: Select offset automatically based on GOP length. --(no-)open-gop Use open GOP configuration. [enabled] --cqmfile <filename> Read custom quantization matrices from a file. --scaling-list <string>: Set scaling list mode. [off] - off: Disable scaling lists. - custom: use custom list (with --cqmfile). - default: Use default lists. --bitrate <integer> Target bitrate [0] - 0: Disable rate control. - N: Target N bits per second. --rc-algorithm <string>: Select used rc-algorithm. [lambda] - lambda: rate control from: DOI: 10.1109/TIP.2014.2336550 - oba: DOI: 10.1109/TCSVT.2016.2589878 --(no-)intra-bits Use Hadamard cost based allocation for intra frames. Default on for gop 8 and off for lp-gop --(no-)clip-neighbour On oba based rate control whether to clip lambda values to same frame's ctus or previous'. Default on for RA GOPS and disabled for LP. --(no-)lossless Use lossless coding. [disabled] --mv-constraint <string> Constrain movement vectors. [none] - none: No constraint - frametile: Constrain within the tile. - frametilemargin: Constrain even more. --roi <filename> Use a delta QP map for region of interest. Reads an array of delta QP values from a file. Text and binary files are sup- ported and detected from the file extension (.txt/.bin). If a known extension is not found, the file is treated as a text file. The file can include one or many ROI frames each in the following format: width and height of the QP delta map followed by width * height delta QP values in raster order. In binary format, width and height are 32-bit integers whereas the delta QP values are signed 8-bit values. The map can be of any size and will be scaled to the video size. The file reading will loop if end of the file is reached. See roi.txt in the examples folder. --set-qp-in-cu Set QP at CU level keeping pic_init_qp_minus26. in PPS and slice_qp_delta in slize header zero. --(no-)erp-aqp Use adaptive QP for 360 degree video with equirectangular pro- jection. [disabled] --level <number> Use the given HEVC level in the output and give an error if level limits are exceeded. [6.2] - 1, 2, 2.1, 3, 3.1, 4, 4.1, 5, 5.1, 5.2, 6, 6.1, 6.2 --force-level <number> Same as --level but warnings instead of errors. --high-tier Used with --level. Use high tier bitrate limits instead of the main tier limits during encoding. High tier requires level 4 or higher. --(no-)vaq <integer> Enable variance adaptive quantization with given strength, in range 1..20. Recommended: 5. [disabled] Compression tools: --(no-)deblock <beta:tc> Deblocking filter. [0:0] - beta: Between -6 and 6 - tc: Between -6 and 6 --sao <string> Sample Adaptive Offset [full] - off: SAO disabled - band: Band offset only - edge: Edge offset only - full: Full SAO --(no-)rdoq Rate-distortion optimized quantization [enabled] --(no-)rdoq-skip Skip RDOQ for 4x4 blocks. [disabled] --(no-)signhide Sign hiding [disabled] --(no-)smp Symmetric motion partition [disabled] --(no-)amp Asymmetric motion partition [disabled] --rd <integer> Mode search complexity [0] - 0: Skip intra if inter is good enough. - 1: Rough intra mode search with SATD. - 2: Refine mode search with SSE. - 3: More SSE candidates for inter and chroma mode search for 4x4 intra. - 4: Even more SSE candidates for both. - 5: Try all intra modes. --(no-)mv-rdo Rate-distortion optimized motion vector costs [disabled] --(no-)zero-coeff-rdo If a CU is set inter, check if forcing zero residual improves the RD cost. [enabled] --(no-)full-intra-search Try all intra modes during rough search. [disabled] --(no-)intra-chroma-search Test non-derived intra chroma modes. [disabled] --(no-)transform-skip Try transform skip [disabled] --me <string> Integer motion estimation algorithm [hexbs] - hexbs: Hexagon Based Search - tz: Test Zone Search - full: Full Search - full8, full16, full32, full64 - dia: Diamond Search --me-steps <integer> Motion estimation search step limit. Only affects 'hexbs' and 'dia'. [-1] --subme <integer> Fractional pixel motion estimation level [4] - 0: Integer motion estimation only - 1: + 1/2-pixel horizontal and vertical - 2: + 1/2-pixel diagonal - 3: + 1/4-pixel horizontal and vertical - 4: + 1/4-pixel diagonal --(no-)fast-bipred Only perform fast bipred search. [enabled] --pu-depth-inter <int>-<int> Inter prediction units sizes [0-3] - 0, 1, 2, 3: from 64x64 to 8x8 - Accepts a list of values separated by ',' for setting separate depths per GOP layer (values can be omitted to use the first value for the respective layer). --pu-depth-intra <int>-<int> Intra prediction units sizes [1-4] - 0, 1, 2, 3, 4: from 64x64 to 4x4 - Accepts a list of values separated by ',' for setting separate depths per GOP layer (values can be omitted to use the first value for the respective layer). --ml-pu-depth-intra Predict the pu-depth-intra using machine learning trees, overrides the --pu-depth-intra parameter. [disabled] --(no-)combine-intra-cus: Whether the encoder tries to code a cu on lower depth even when search is not performed on said depth. Should only be disabled if cus absolutely must not be larger than limited by the search. [enabled] --force-inter Force the encoder to use inter always. This is mostly for de- bugging and is not guaranteed to produce sensible bitstream or work at all. [disabled] --tr-depth-intra <int> Transform split depth for intra blocks [0] --(no-)bipred Bi-prediction [enabled] --cu-split-termination <string> CU split search termination [zero] - off: Don't terminate early. - zero: Terminate when residual is zero. --me-early-termination <string> Motion estimation termination [on] - off: Don't terminate early. - on: Terminate early. - sensitive: Terminate even earlier. --fast-residual-cost <int> Skip CABAC cost for residual coefficients when QP is below the limit. [0] --fast-coeff-table <string> Read custom weights for residual coefficients from a file instead of using defaults [default] --fast-rd-sampling Enable learning data sampling for fast coefficient table generation --fastrd-accuracy-check Evaluate the accuracy of fast coefficient prediction --fastrd-outdir Directory to which to output sampled data or accuracy data, into <fastrd-outdir>/0.txt to 50.txt, one file for each QP that blocks were estimated on --(no-)intra-rdo-et Check intra modes in rdo stage only until a zero coefficient CU is found. [disabled] --(no-)early-skip Try to find skip cu from merge candidates. Perform no further search if skip is found. For rd=0..1: Try the first candidate. For rd=2.. Try the best candidate based on luma satd cost. [enabled] --max-merge <integer> Maximum number of merge candidates, 1..5 [5] --(no-)implicit-rdpcm Implicit residual DPCM. Currently only supported with lossless coding. [disabled] --(no-)tmvp Temporal motion vector prediction [enabled] Parallel processing: --threads <integer> Number of threads to use [auto] - 0: Process everything with main thread. - N: Use N threads for encoding. - auto: Select automatically. --owf <integer> Frame-level parallelism [auto] - N: Process N+1 frames at a time. - auto: Select automatically. --(no-)wpp Wavefront parallel processing. [enabled] Enabling tiles automat- ically disables WPP. To enable WPP with tiles, re-enable it af- ter enabling tiles. Enabling wpp with tiles is, however, an ex- perimental feature since it is not supported in any HEVC pro- file. --tiles <int>x<int> Split picture into width x height uniform tiles. --tiles-width-split <string>|u<int> - <string>: A comma-separated list of tile column pixel coordinates. - u<int>: Number of tile columns of uniform width. --tiles-height-split <string>|u<int> - <string>: A comma-separated list of tile row column pixel coordinates. - u<int>: Number of tile rows of uniform height. --slices <string> Control how slices are used. - tiles: Put tiles in independent slices. - wpp: Put rows in dependent slices. - tiles+wpp: Do both. --partial-coding <x-offset>!<y-offset>!<slice-width>!<slice-height> Encode partial frame. Parts must be merged to form a valid bit- stream. X and Y are CTU offsets. Slice width and height must be divisible by CTU in pixels unless it is the last CTU row/col- umn. This parameter is used by kvaShare. Video Usability Information: --sar <width:height> Specify sample aspect ratio --overscan <string> Specify crop overscan setting [undef] - undef, show, crop --videoformat <string> Specify video format [undef] - undef, component, pal, ntsc, secam, mac --range <string> Specify color range [tv] - tv, pc --colorprim <string> Specify color primaries [undef] - undef, bt709, bt470m, bt470bg, smpte170m, smpte240m, film, bt2020 --transfer <string> Specify transfer characteristics [undef] - undef, bt709, bt470m, bt470bg, smpte170m, smpte240m, linear, log100, log316, iec61966-2-4, bt1361e, iec61966-2-1, bt2020-10, bt2020-12 --colormatrix <string> Specify color matrix setting [undef] - undef, bt709, fcc, bt470bg, smpte170m, smpte240m, GBR, YCgCo, bt2020nc, bt2020c --chromaloc <integer> Specify chroma sample location (0 to 5) [0] kvazaar v2.3.2 September 2025 KVAZAAR(1)
NAME | SYNOPSIS | DESCRIPTION
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