* compression scheme (if any).
*/
int apt = (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0 : 1);
+ int fs = c->picture.top_field_first ? 0x00 : 0x40;
uint8_t aspect = 0;
if ((int)(av_q2d(c->avctx->sample_aspect_ratio) * c->avctx->width / c->avctx->height * 10) >= 17) /* 16:9 */
buf[2] = 0xc8 | /* reserved -- always b11001xxx */
aspect;
buf[3] = (1 << 7) | /* frame/field flag 1 -- frame, 0 -- field */
- (1 << 6) | /* first/second field flag 0 -- field 2, 1 -- field 1 */
+ fs | /* first/second field flag 0 -- field 2, 1 -- field 1 */
(1 << 5) | /* frame change flag 0 -- same picture as before, 1 -- different */
(1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
0xc; /* reserved -- always b1100 */