public static extern int av_frame_set_qp_table(AVFrame* f, AVBufferRef* buf, int stride, int type);
 public static extern int av_buffer_make_writable(AVBufferRef** buf);
 public static extern int av_buffer_realloc(AVBufferRef** buf, int size);
 public static extern int av_buffer_get_ref_count(AVBufferRef* buf);
 public static extern void* av_buffer_get_opaque(AVBufferRef* buf);
 public static extern int av_buffer_is_writable(AVBufferRef* buf);
 public static extern void av_buffer_unref(AVBufferRef** buf);
 public static extern AVBufferRef* av_buffer_ref(AVBufferRef* buf);