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avcodec/mpeg12dec: fix time_base and framerate

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They are not just inverses of each other.
This should restore behavior to before the introduction of framerate

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-15 15:54:02 +02:00
parent 801876fb07
commit 620e7f0f3b
2 changed files with 6 additions and 4 deletions
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2
libavcodec/mpeg12dec.c
View File

@ -1316,7 +1316,7 @@ static int mpeg_decode_postinit(AVCodecContext *avctx)
// MPEG-2 fps
av_reduce(&s->avctx->framerate.num,
&s->avctx->framerate.den,
ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1 << 30);
avctx->ticks_per_frame = 2;

8
libavcodec/mpegvideo_parser.c
View File

@ -73,6 +73,7 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
pc->frame_rate = avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_index];
bit_rate = (buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6);
avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
avctx->ticks_per_frame = 1;
}
break;
case EXT_START_CODE:
@ -94,9 +95,10 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
bit_rate = (bit_rate&0x3FFFF) | (bit_rate_ext << 18);
if(did_set_size)
ff_set_dimensions(avctx, pc->width, pc->height);
avctx->framerate.num = pc->frame_rate.num * (frame_rate_ext_n + 1) * 2;
avctx->framerate.num = pc->frame_rate.num * (frame_rate_ext_n + 1);
avctx->framerate.den = pc->frame_rate.den * (frame_rate_ext_d + 1);
avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
avctx->ticks_per_frame = 2;
}
break;
case 0x8: /* picture coding extension */
@ -151,7 +153,7 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
}
#if FF_API_AVCTX_TIMEBASE
if (avctx->framerate.num)
avctx->time_base = av_inv_q(avctx->framerate);
avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
#endif
}
@ -181,7 +183,7 @@ static int mpegvideo_parse(AVCodecParserContext *s,
function should be negligible for uncorrupted streams */
mpegvideo_extract_headers(s, avctx, buf, buf_size);
av_dlog(NULL, "pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
s->pict_type, av_q2d(avctx->framerate), s->repeat_pict);
*poutbuf = buf;
*poutbuf_size = buf_size;