[FFEncoder ]
0. ʵ
    FFEncoder ĳ򴰿, ʱڶ̬. ΪʵΪ FFEncoder.
1. ض̬
   FFEncoder.LoadAVLib('̬·')
    False ʾʧ
2. һ Task, ʹ FFmpeg в
   TaskIndex := FFEncoder.AddTask([options] [[infile options] -i infile]... {[outfile options] outfile}...)
    TaskIndex < 0 ʾʧ
3.  OnProgress ¼
   ʾתϢĴ
4.  OnTerminate ¼
   תƴ
5. Ҫ־Ϣ, Ҫһ FFLogger 
    OnLog ¼ʾ־Ϣ
6. ʼת
   FFEncoder.Start(1)
7. ȴ
