c#生成AVI自动设置压缩格式，不调用AVISaveOptions

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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);