ffmpeg 码率控制设置

ffmpeg中CBR（固定码率控制）的设置：

                c->bit_rate = br;
                c->rc_min_rate =br;
                c->rc_max_rate = br;  
                c->bit_rate_tolerance = br;
                c->rc_buffer_size=br;
                c->rc_initial_buffer_occupancy = c->rc_buffer_size*3/4;
                c->rc_buffer_aggressivity= (float)1.0;
                c->rc_initial_cplx= 0.5; 

 ffmpeg中VBR（可变率控制）的设置：

 c->flags = CODEC_FLAG_PASS2;  ///VBR模式

                c->flags |= CODEC_FLAG_QSCALE;
                c->rc_min_rate =min;
                c->rc_max_rate = max; 
                c->bit_rate = br;

摘自：

http://blog.csdn.net/maoxueer/article/details/2984079

参考：

http://blog.csdn.net/maoxueer/article/details/2984059

http://zpbeibei.blog.163.com/blog/static/80454215201365113436854/