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x264

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Befehl
Name
Kurzbeschreibung
Autor
Webseite
Lizenz
Syntax
Beispiele
Links


Befehlx264
Namex264
KurzbeschreibungEncoder für Video-Format H.264 (Mpeg-4 AVC)
AutorVideoLan
Webseitehttp://www.videolan.org/developers/x264.html
LizenzGNU
Syntax
x264 core:38 svn-341
Syntax: x264 [options] -o outfile infile [widthxheight]

Infile can be raw YUV 4:2:0 (in which case resolution is required),
  or AVI or Avisynth if compiled with AVIS support (yes).
Outfile type is selected by filename:
 .264 -> Raw bytestream
 .mkv -> Matroska
 .mp4 -> MP4 if compiled with GPAC support (yes)

Options:

  -h, --help                  Print this help

Frame-type options:

  -I, --keyint <integer>      Maximum GOP size [250]
  -i, --min-keyint <integer>  Minimum GOP size [25]
      --scenecut <integer>    How aggressively to insert extra I-frames [40]
  -b, --bframes <integer>     Number of B-frames between I and P [0]
      --no-b-adapt            Disable adaptive B-frame decision
      --b-bias <integer>      Influences how often B-frames are used [0]
      --b-pyramid             Keep some B-frames as references

      --no-cabac              Disable CABAC
  -r, --ref <integer>         Number of reference frames [1]
      --nf                    Disable loop filter
  -f, --filter <alpha:beta>   Loop filter AlphaC0 and Beta parameters [0:0]

Ratecontrol:

  -q, --qp <integer>          Set QP (0=lossless) [26]
  -B, --bitrate <integer>     Set bitrate
      --crf <integer>         Quality-based VBR (nominal QP)
      --qpmin <integer>       Set min QP [10]
      --qpmax <integer>       Set max QP [51]
      --qpstep <integer>      Set max QP step [4]
      --ratetol <float>       Allowed variance of average bitrate [1.0]
      --vbv-maxrate <integer> Max local bitrate [0]
      --vbv-bufsize <integer> Size of VBV buffer [0]
      --vbv-init <float>      Initial VBV buffer occupancy [0.9]

      --ipratio <float>       QP factor between I and P [1.40]
      --pbratio <float>       QP factor between P and B [1.30]
      --chroma-qp-offset <integer>  QP difference between chroma and luma [0]

  -p, --pass <1|2|3>          Enable multipass ratecontrol:
                                  - 1: First pass, creates stats file
                                  - 2: Last pass, does not overwrite stats file
                                  - 3: Nth pass, overwrites stats file
      --stats <string>        Filename for 2 pass stats ["x264_2pass.log"]
      --rceq <string>         Ratecontrol equation ["blurCplx^(1-qComp)"]
      --qcomp <float>         QP curve compression: 0.0 => CBR, 1.0 => CQP [0.60]
      --cplxblur <float>      Reduce fluctuations in QP (before curve compression) [20.0]
      --qblur <float>         Reduce fluctuations in QP (after curve compression) [0.5]

      --zones <zone0>/<zone1>/...
                              Tweak the bitrate of some regions of the video
                              Each zone is of the form
                                  <start frame>,<end frame>,<option>
                                  where <option> is either
                                      q=<integer> (force QP)
                                  or  b=<float> (bitrate multiplier)

Analysis:

  -A, --analyse <string>      Partitions to consider ["p8x8,b8x8,i8x8,i4x4"]
                                  - p8x8, p4x4, b8x8, i8x8, i4x4
                                  - none, all
                                  (p4x4 requires p8x8. i8x8 requires --8x8dct.)
      --direct <string>       Direct MV prediction mode ["temporal"]
                                  - none, spatial, temporal
  -w, --weightb               Weighted prediction for B-frames
      --me <string>           Integer pixel motion estimation method ["hex"]
                                  - dia: diamond search, radius 1 (fast)
                                  - hex: hexagonal search, radius 2
                                  - umh: uneven multi-hexagon search
                                  - esa: exhaustive search (slow)
      --merange <integer>     Maximum motion vector search range [16]
  -m, --subme <integer>       Subpixel motion estimation and partition
                                  decision quality: 1=fast, 6=best. [5]
      --mixed-refs            Decide references on a per partition basis
      --no-chroma-me          Ignore chroma in motion estimation
  -8, --8x8dct                Adaptive spatial transform size

      --cqm <string>          Preset quant matrices ["flat"]
                                  - jvt, flat
      --cqmfile <string>      Read quant matrices from a JM-compatible file
                                  Overrides any other --cqm* options.
      --cqm4 <list>           Set all 4x4 quant matrices
                                  Takes a comma-separated list of 16 integers.
      --cqm8 <list>           Set all 8x8 quant matrices
                                  Takes a comma-separated list of 64 integers.
      --cqm4i, --cqm4p, --cqm8i, --cqm8p
                              Set both luma and chroma quant matrices
      --cqm4iy, --cqm4ic, --cqm4py, --cqm4pc
                              Set individual quant matrices

Video Usability Info (Annex E):
The VUI settings are not used by the encoder but are merely suggestions to
the playback equipment. See doc/vui.txt for details. Use at your own risk.

      --sar width:height      Specify Sample Aspect Ratio
      --overscan <string>     Specify crop overscan setting ["undef"]
                                  - undef, show, crop
      --videoformat <string>  Specify video format ["undef"]
                                  - component, pal, ntsc, secam, mac, undef
      --fullrange <string>    Specify full range samples setting ["off"]
                                  - off, on
      --colorprim <string>    Specify color primaries ["undef"]
                                  - undef, bt709, bt470m, bt470bg
                                    smpte170m, smpte240m, film
      --transfer <string>     Specify transfer characteristics ["undef"]
                                  - undef, bt709, bt470m, bt470bg, linear,
                                    log100, log316, smpte170m, smpte240m
      --colormatrix <string>  Specify color matrix setting ["undef"]
                                  - undef, bt709, fcc, bt470bg
                                    smpte170m, smpte240m, GBR, YCgCo
      --chromaloc <integer>   Specify chroma sample location (0 to 5) [0]

Input/Output:

      --level <integer>       Specify level (as defined by Annex A)
      --fps <float|rational>  Specify framerate
      --seek <integer>        First frame to encode
      --frames <integer>      Maximum number of frames to encode
  -o, --output                Specify output file

      --threads <integer>     Parallel encoding (uses slices)
      --no-asm                Disable all CPU optimizations
      --no-psnr               Disable PSNR computation
      --quiet                 Quiet Mode
  -v, --verbose               Print stats for each frame
      --progress              Show a progress indicator while encoding
      --visualize             Show MB types overlayed on the encoded video
      --aud                   Use access unit delimiters

Beispiele
Links

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