* media-libs/x264-svn
Latest version available: 20061014-r1
Latest version installed: [ Not Installed ]
Size of files: 281 kB
Homepage: http://developers.videolan.org/x264.html
Description: A free library for encoding X264/AVC streams.
License: GPL-2

* media-video/x264-svn-encoder
Latest version available: 20061014
Latest version installed: [ Not Installed ]
Size of files: 281 kB
Homepage: http://developers.videolan.org/x264.html
Description: A free library for encoding X264/AVC streams.
License: GPL-2

gentoo andre # x264 --help
x264 core:54
Syntax: x264 [options] -o outfile infile [widthxheight]

Infile can be raw YUV 4:2:0 (in which case resolution is required),
or YUV4MPEG 4:2:0 (*.y4m),
or AVI or Avisynth if compiled with AVIS support (no).
Outfile type is selected by filename:
.264 -> Raw bytestream
.mkv -> Matroska
.mp4 -> MP4 if compiled with GPAC support (no)

Options:

-h, --help List the more commonly used options
--longhelp List all options

Frame-type options:

-I, --keyint <integer> Maximum GOP size [250]
-b, --bframes <integer> Number of B-frames between I and P [0]
--b-pyramid Keep some B-frames as references
--no-cabac Disable CABAC
-r, --ref <integer> Number of reference frames [1]
-f, --deblock <alpha:beta> Loop filter AlphaC0 and Beta parameters [0:0]
--interlaced Enable pure-interlaced mode

Ratecontrol:

-q, --qp <integer> Set QP (0=lossless) [26]
-B, --bitrate <integer> Set bitrate (kbit/s)
--crf <float> Quality-based VBR (nominal QP)
--vbv-bufsize <integer> Enable CBR and set size of the VBV buffer (kbit) [0]
--ratetol <float> Allowed variance of average bitrate [1.0]
--ipratio <float> QP factor between I and P [1.40]
--pbratio <float> QP factor between P and B [1.30]

-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"]
--qcomp <float> QP curve compression: 0.0 => CBR, 1.0 => CQP [0.60]
--zones <zone0>/<zone1>/... Tweak the bitrate of some regions of the video

Analysis:

-A, --partitions <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 ["spatial"]
- none, spatial, temporal, auto
-w, --weightb Weighted prediction for B-frames
--me <string> Integer pixel motion estimation method ["hex"]
- dia, hex, umh
--merange <integer> Maximum motion vector search range [16]
-m, --subme <integer> Subpixel motion estimation and partition
decision quality: 1=fast, 7=best. [5]
--b-rdo RD based mode decision for B-frames. Requires subme 6.
--mixed-refs Decide references on a per partition basis
-8, --8x8dct Adaptive spatial transform size
-t, --trellis <integer> Trellis RD quantization. Requires CABAC. [0]
- 0: disabled
- 1: enabled only on the final encode of a MB
- 2: enabled on all mode decisions
--no-fast-pskip Disables early SKIP detection on P-frames
--no-dct-decimate Disables coefficient thresholding on P-frames
--nr <integer> Noise reduction [0]
--cqmfile <string> Read custom quant matrices from a JM-compatible file

Input/Output:

-o, --output Specify output file
--sar width:height Specify Sample Aspect Ratio
--fps <float|rational> Specify framerate
--seek <integer> First frame to encode
--frames <integer> Maximum number of frames to encode
--level <string> Specify level (as defined by Annex A)

-v, --verbose Print stats for each frame
--progress Show a progress indicator while encoding
--quiet Quiet Mode
--no-psnr Disable PSNR computation
--no-ssim Disable SSIM computation
--threads <integer> Parallel encoding (uses slices)
--thread-input Run Avisynth in its own thread