BFRAME_POST
case BFRAME_POST:
framelen[2] = mpeg1_frame_header(go, buf + i, 0, 1, BFRAME_POST);
0, 2, BFRAME_POST);
case BFRAME_POST:
framelen[2] = mpeg4_frame_header(go, buf + i, 0, BFRAME_POST);
framelen[6] = mpeg4_frame_header(go, buf + i, 1, BFRAME_POST);