mirror of
https://github.com/mpv-player/mpv
synced 2025-03-19 18:05:21 +00:00
x264 section reviewed.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13181 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
diego
parent
ae626b4fe4
commit
ebd110a197
@ -4627,7 +4627,7 @@ syntax:
|
||||
.B \-<codec>opts <option1[=value],option2,...>
|
||||
.
|
||||
.PP
|
||||
Where <codec> may be: lavc, xvidenc, divx4, lame, x264
|
||||
Where <codec> may be: lavc, xvidenc, divx4, lame, x264enc
|
||||
.
|
||||
.
|
||||
.SS divx4 (\-divx4opts)
|
||||
@ -6221,52 +6221,51 @@ This is required if you want a CBR (constant bitrate) encode.
|
||||
.
|
||||
.TP
|
||||
.B iframe=<value>
|
||||
Frequency of I frames (default: 60)
|
||||
I frame frequency (default: 60)
|
||||
.
|
||||
.TP
|
||||
.B frameref=<value>
|
||||
Number of previous frames used as predictors in a P-frame (default: 1)
|
||||
Number of previous frames used as predictors in a P-frame (default: 1).
|
||||
.br
|
||||
.I NOTE:
|
||||
The current version of x264 (r38) hasn't yet implemented this feature.
|
||||
As of x264 r38 this feature is not implemented yet.
|
||||
.
|
||||
.TP
|
||||
.B idrframe=<value>
|
||||
Each <value> I-Frames are IDR-Frames.
|
||||
Each <value> I-Frames are IDR-Frames (default: 2).
|
||||
In H.264, I-Frames do not necessarily bound a closed GOP because it is
|
||||
allowable for a P-frame to be predicted from more frames than just the one
|
||||
frame before it (also see frameref).
|
||||
Therefore, I-frames are not necessarily seekable. IDR-Frames restrict
|
||||
subsequent P-frames from referring to any frame prior to the IDR-Frame
|
||||
(default: 2)
|
||||
Therefore, I-frames are not necessarily seekable.
|
||||
IDR-Frames restrict subsequent P-frames from referring to any frame
|
||||
prior to the IDR-Frame.
|
||||
.
|
||||
.TP
|
||||
.B bframe=<value>
|
||||
Number of B-Frames between I- and P-Frames (default: 0)
|
||||
number of B-Frames between I- and P-Frames (default: 0)
|
||||
.
|
||||
.TP
|
||||
.B deblock=<0|1>
|
||||
Use deblocking filter (default: on)
|
||||
Use deblocking filter (default: on).
|
||||
.
|
||||
.TP
|
||||
.B deblockalpha=<-6-6>
|
||||
AlphaC0 parameter of deblocking filter.
|
||||
AlphaC0 parameter of deblocking filter (default: 0).
|
||||
This adjusts thresholds for the H.264 deblocking filter.
|
||||
First, this parameter adjusts the maximum amount of change that the filter is
|
||||
allowed to cause on any one pixel.
|
||||
Secondly, this parameter affects the threshold for difference across the
|
||||
edge being filtered.
|
||||
A positive value reduces blocking artifacts more, but will also smear details
|
||||
(default: 0)
|
||||
A positive value reduces blocking artifacts more, but will also smear details.
|
||||
.
|
||||
.TP
|
||||
.B deblockbeta=<-6-6>
|
||||
Beta parameter of deblocking filter.
|
||||
Affects the maximum allowed gradient within two adjacent blocks (default: 0)
|
||||
Beta parameter of deblocking filter (default: 0).
|
||||
Affects the maximum allowed gradient within two adjacent blocks.
|
||||
.
|
||||
.TP
|
||||
.B cabac
|
||||
Use CABAC (Context-Adaptive Binary Arithmetic Coding) (default: off)
|
||||
Use CABAC (Context-Adaptive Binary Arithmetic Coding).
|
||||
.
|
||||
.TP
|
||||
.B cabacidc=<value>
|
||||
@ -6276,7 +6275,7 @@ first block in a frame, there are no prior blocks to predict the context.
|
||||
Adjusting this may affect bitrate by a fraction of a percent, but it doesn't
|
||||
directly affect distortion.
|
||||
.RSs
|
||||
-1: Let the encoder decide which context (default) (it usually chooses 0)
|
||||
-1: Encoder chooses context, usually 0 (default).
|
||||
.br
|
||||
0: low complexity
|
||||
.br
|
||||
@ -6288,25 +6287,26 @@ directly affect distortion.
|
||||
.TP
|
||||
.B qp_constant=<2-51>
|
||||
This selects the quantizer to use.
|
||||
20-40 is a useful range (default: 26).
|
||||
Lower values result in better fidelity, but higher bitrates.
|
||||
Note that quantization in H.264 works differently from mpeg[124].
|
||||
H.264's QP is on a logarithmic scale. As an example, the bitrate difference
|
||||
between QP=20 and QP=40 is about a factor of 10.
|
||||
Useful quantizers in H.264 tend to be very large compared to mpeg[124].
|
||||
20-40 is a useful range (default: 26)
|
||||
Note that quantization in H.264 works differently from MPEG[124].
|
||||
H.264's QP is on a logarithmic scale.
|
||||
As an example, the bitrate difference between QP=20 and QP=40
|
||||
is about a factor of 10.
|
||||
Useful quantizers in H.264 tend to be very large compared to MPEG[124].
|
||||
.br
|
||||
.I NOTE:
|
||||
This option takes effect even if you specify a cbr encode.
|
||||
In such a case, the first frame encoded will use the quantization factor you
|
||||
This option takes effect even if you specify a CBR encode.
|
||||
In such a case, the first encoded frame will use the quantization factor you
|
||||
specified, but in later frames, the ratecontrol decides what quants to use.
|
||||
.
|
||||
.TP
|
||||
.B qp_min=<2-51>
|
||||
Minimum quantizer. CBR only. 20-40 seems to be a useful range (default: 2)
|
||||
.B qp_min=<2-51> (CBR only)
|
||||
Minimum quantizer, 20-40 seems to be a useful range (default: 2).
|
||||
.
|
||||
.TP
|
||||
.B qp_max=<2-51>
|
||||
Maximum quantizer. CBR only.
|
||||
.B qp_max=<2-51> (CBR only)
|
||||
Maximum quantizer
|
||||
.
|
||||
.TP
|
||||
.B qp_step=<value>
|
||||
@ -6315,43 +6315,47 @@ frames.
|
||||
.
|
||||
.TP
|
||||
.B rc_buffer_size=<value>
|
||||
Size of the ratecontrol buffer. (default: 1 second's worth at the bitrate you
|
||||
ratecontrol buffer size (default: 1 second's worth at the bitrate you
|
||||
specified)
|
||||
.
|
||||
.TP
|
||||
.B rc_init_buffer=<value>
|
||||
Set the initial size of ratecontrol buffer (default: 1/4 of rc_buffer_size)
|
||||
Set the initial ratecontrol buffer (default: 1/4 of rc_buffer_size)
|
||||
.
|
||||
.TP
|
||||
.B rc_sens=<0-100>
|
||||
Ratecontrol sensitivity (default: 100)
|
||||
ratecontrol sensitivity (default: 100)
|
||||
.
|
||||
.TP
|
||||
.B ip_factor=<value>
|
||||
Quantizer factor between I amd P frames (default: 2.0)
|
||||
quantizer factor between I amd P frames (default: 2.0)
|
||||
.
|
||||
.TP
|
||||
.B pb_factor=<value>
|
||||
Quantizer factor between P and B frames (default: 2.0)
|
||||
quantizer factor between P and B frames (default: 2.0)
|
||||
.
|
||||
.TP
|
||||
.B pass=<1|2>
|
||||
For 2-pass mode. The first pass saves statistics.
|
||||
Enable 2-pass mode.
|
||||
The first pass saves statistics.
|
||||
.
|
||||
.TP
|
||||
.B qcompress=<0-1>
|
||||
Quantizer compression. This affects the ratecontrol: a lower value makes the
|
||||
quantizer compression (default: 0.6).
|
||||
This affects the ratecontrol: a lower value makes the
|
||||
bitrate more constant, while a higher value makes the quantization parameter
|
||||
more constant (default: 0.6)
|
||||
more constant.
|
||||
.
|
||||
.TP
|
||||
.B qblur=<0-1>
|
||||
Temporal blur of the quantization parameter. Lower values allow the quantizer
|
||||
value to jump around more; higher values force it to vary more smoothly
|
||||
(default: 0.5)
|
||||
Temporal blur of the quantization parameter (default: 0.5).
|
||||
Lower values allow the quantizer value to jump around more,
|
||||
higher values force it to vary more smoothly.
|
||||
.
|
||||
.TP
|
||||
.B fullinter
|
||||
Use all available interframe analyse methods (i4x4, psub8x8, psub16x16)
|
||||
(default: 4x4, psub16x16)
|
||||
Use all available interframe analysis methods (i4x4, psub8x8, psub16x16)
|
||||
(default: 4x4, psub16x16).
|
||||
.
|
||||
.TP
|
||||
.B log=<-1-3>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user