2016-06-08：Windows中的bat脚本

涉及循环嵌套，启用变量延时，算术运算

@echo off
setlocal enabledelayedexpansion
%路径以及文件名等变量设置%
set x264_exe=E:\demo\c++\x264\vs2008_build\bin\x264.exe
set encode_basic_option=--fps 20 --profile baseline --tune zerolatency --min-keyint 20 --keyint 30 --no-scenecut
set input_path=E:\video\yuv_640x480\
set output_path=E:\video\x264\
set name_prefix=video_640x480

%同时设置VBV和CRF%
for /l %%i in (1,1,2) do (
call :CRF
)
goto :eofvbv

:CRF
for /l %%c in (17,2,19) do (
call :VBV
)
goto :eofvbv

:VBV
for /l %%v in (100,100,200) do (
set bufsize=%%v
set /a bufsize=!bufsize!+!bufsize!/2
echo %x264_exe% %encode_basic_option% --crf %%c --vbv-maxrate %%v --vbv-bufsize !bufsize!  -o %output_path%%name_prefix%_%%i_crf%%c_vbv%%v.h264 %input_path%%name_prefix%_%%i.yuv
)

:eofvbv

@echo off

%路径以及文件名等变量设置%
set x264_exe=E:\demo\c++\x264\vs2008_build\bin\x264.exe
set encode_basic_option=--fps 20 --profile baseline --tune zerolatency --min-keyint 20 --keyint 30 --no-scenecut
set input_path=E:\video\yuv_640x480\
set output_path=E:\video\x264\
set name_prefix=video_640x480

%不设置VBV%
for /l %%i in (1,1,1) do call :CRF %%i
goto :eofnovbv
:CRF
for /l %%c in (17,2,19) do (
   echo %x264_exe% %encode_basic_option% --crf %%c -o %output_path%%name_prefix%_%%i_crf%%c_vbvno.h264 %input_path%%name_prefix%_%%i.yuv
)
:eofnovbv