c#生成AVI自动设置压缩格式，不调用AVISaveOptions

工作中遇到生成AVI视频的项目，代码中会调用AVISaveOptions来设置压缩格式，针对单个文件还好说，但是批量生成视频的时候，每一个都要设置格式，

体验不是很好，经过查询资料问题得到解决

最开始的代码：

AVICOMPRESSOPTIONS opts = new AVICOMPRESSOPTIONS();
opts.fccType = _fccType;
opts.fccHandler = 0;
opts.dwKeyFrameEvery = 0;
opts.dwQuality = 0;
opts.dwFlags = 0;
opts.dwBytesPerSecond = 0;
opts.lpFormat = new IntPtr(0);
opts.cbFormat = 0;
opts.lpParms = new IntPtr(0);
opts.cbParms = 0;
opts.dwInterleaveEvery = 0;
AVICOMPRESSOPTIONS* p = &opts;
AVICOMPRESSOPTIONS** pp = &p;
IntPtr x = _ps;
IntPtr* ptr_ps = &x;
AVISaveOptions(0, 0, 1, ptr_ps, pp);
int hr = AVIMakeCompressedStream(out _psCompressed, _ps, ref opts, 0);

　　修改后的代码

 opts.fccType = 0;
            opts.fccHandler = (int)0x6376736d;
            opts.dwKeyFrameEvery = 0;
            opts.dwQuality = 10000;
            opts.dwFlags = 8;
            opts.dwBytesPerSecond = 0;
            opts.lpFormat = new IntPtr(0);
            opts.cbFormat = 0;
            opts.lpParms = new IntPtr(0);
            opts.cbParms = 4;
            opts.dwInterleaveEvery = 0;
            AVICOMPRESSOPTIONS* p = &opts;
            AVICOMPRESSOPTIONS** pp = &p;
            IntPtr x = _ps;
            IntPtr* ptr_ps = &x;
            opts.lpParms = Marshal.AllocHGlobal(sizeof(int));
            //AVISaveOptions(0, 0, 1, ptr_ps, pp);
            int hr = AVIMakeCompressedStream(out _psCompressed, _ps, ref opts, 0);

　　思路就是，Debug模式下，跟踪设置完压缩格式后

AVICOMPRESSOPTIONS结构体中各元素的值，其中lpParms需要利用

Marshal.AllocHGlobal(sizeof(int))来获取，其余根据监视的值设定即可