关于x264新参数--video-filter的使用

nmm520

最近看到x264意思好像是内置了RESIZE和CROP的功能，但我试了几次都失败，谁给讲讲清楚举个例子。
-vf, --video-filter <filter0>/<filter1>/... Apply video filtering to the input
file
      Available filters:
      crop:left,top,right,bottom
      resize:[width,height][,sar][,fittobox][,csp][,method]
      select_every:step,offset1[,...]

lititude

1. >x264 --fullhelp里的filter解释;
   
2. 
   
3. Filtering:
   
4. 
   
5.       Filter options may be specified in the name=value format
   
6. --vf, --video-filter <filter0>/<filter1>/... Apply video filtering to the input file
   
7.       Available filters:
   
8.       crop:left,top,right,bottom
   
9.             removes pixels from the edges of the frame
   
10.       resize:[width,height][,sar][,fittobox][,csp][,method]
    
11.             resizes frames based on the given criteria:
    
12.             - resolution only: resizes and adapts sar to avoid stretching
    
13.             - sar only: sets the sar and resizes to avoid stretching
    
14.             - resolution and sar: resizes to given resolution and sets the sar
    
15.             - fittobox: resizes the video based on the desired contraints
    
16.                - width, height, both
    
17.             - fittobox and sar: same as above except with specified sar
    
18.             simultaneously converting to the given colorspace
    
19.             using resizer method ["bicubic"]
    
20.              - fastbilinear, bilinear, bicubic, experimental, point,
    
21.              - area, bicublin, gauss, sinc, lanczos, spline
    
22.       select_every:step,offset1[,...]
    
23.             apply a selection pattern to input frames
    
24.             step: the number of frames in the pattern
    
25.             offsets: the offset into the step to select a frame
    
26.             see: http://avisynth.org/mediawiki/Select#SelectEvery
    

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-vf 滤镜1:参数1,参数2[,参数3...][/滤镜2...]

滤镜名称和参数之间用冒号，不同参数之间用逗号分开，滤镜之间用斜杠隔开。

举个例子：

1. --vf crop:8,0,8,0/resize:640,480,,,,lanczos

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首先左右各切8，再用lanczos算法rezie到640x480