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- diff --git a/libavcodec/dv.c b/libavcodec/dv.c
- index a7dfbdc..5b4ad23 100644
- --- a/libavcodec/dv.c
- +++ b/libavcodec/dv.c
- @@ -818,6 +818,7 @@ static inline int dv_write_pack(enum dv_pack_type pack_id, DVVideoContext *c,
- * 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 */
- @@ -856,7 +857,7 @@ static inline int dv_write_pack(enum dv_pack_type pack_id, DVVideoContext *c,
- 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 */
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