diff --git a/ffmpeg.c b/ffmpeg.c
index f757eb5019abd216ace9d5adec63bb6b33283f13..1e31570fd0c28f8a2239c2bcf4b3885b09b732f2 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -1261,7 +1261,7 @@ static int output_packet(AVInputStream *ist, int ist_index,
goto discard_packet;
}
if (ist->st->codec->time_base.num != 0) {
- int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : 1;
+ int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->st->codec->ticks_per_frame;
ist->next_pts += ((int64_t)AV_TIME_BASE *
ist->st->codec->time_base.num * ticks) /
ist->st->codec->time_base.den;
@@ -1290,7 +1290,7 @@ static int output_packet(AVInputStream *ist, int ist_index,
break;
case CODEC_TYPE_VIDEO:
if (ist->st->codec->time_base.num != 0) {
- int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : 1;
+ int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->st->codec->ticks_per_frame;
ist->next_pts += ((int64_t)AV_TIME_BASE *
ist->st->codec->time_base.num * ticks) /
ist->st->codec->time_base.den;
@@ -1750,9 +1750,10 @@ static int av_encode(AVFormatContext **output_files,
codec->bit_rate = icodec->bit_rate;
codec->extradata= icodec->extradata;
codec->extradata_size= icodec->extradata_size;
- if(av_q2d(icodec->time_base) > av_q2d(ist->st->time_base) && av_q2d(ist->st->time_base) < 1.0/1000)
+ if(av_q2d(icodec->time_base)*icodec->ticks_per_frame > av_q2d(ist->st->time_base) && av_q2d(ist->st->time_base) < 1.0/1000){
codec->time_base = icodec->time_base;
- else
+ codec->time_base.num *= icodec->ticks_per_frame;
+ }else
codec->time_base = ist->st->time_base;
switch(codec->codec_type) {
case CODEC_TYPE_AUDIO:
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index a3bfcbc4310b8bb3ba4f8d44b7008d63d1d6b3d9..b078bc98c21d6042f214124b879485b5b5efbab9 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -30,7 +30,7 @@
#include "libavutil/avutil.h"
#define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 19
+#define LIBAVCODEC_VERSION_MINOR 20
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@@ -2323,6 +2323,15 @@ typedef struct AVCodecContext {
* - decoding: Set by libavcodec
*/
struct AVHWAccel *hwaccel;
+
+ /**
+ * For some codecs, the time base is closer to the field rate than the frame rate.
+ * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
+ * if no telecine is used ...
+ *
+ * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
+ */
+ int ticks_per_frame;
} AVCodecContext;
/**
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 64ca5b7e66ad80cbdc8c0890d95e2daacc6fdd4a..24dc201e9fbbb185600810f1f7d11e2b49924dc2 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -2201,6 +2201,7 @@ static av_cold int decode_init(AVCodecContext *avctx){
h->sei_dpb_output_delay = 0;
h->sei_cpb_removal_delay = -1;
h->sei_buffering_period_present = 0;
+ avctx->ticks_per_frame = 2;
return 0;
}
diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 46d7946aaae277005c41c860dea9ce4fe241efac..6988da22f62a91dd4c359177bc82c7e097bed15a 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -1269,7 +1269,7 @@ static int mpeg_decode_postinit(AVCodecContext *avctx){
//MPEG-1 aspect
avctx->sample_aspect_ratio= av_d2q(
1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
-
+ avctx->ticks_per_frame=1;
}else{//MPEG-2
//MPEG-2 fps
av_reduce(
@@ -1278,6 +1278,7 @@ static int mpeg_decode_postinit(AVCodecContext *avctx){
ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1<<30);
+ avctx->ticks_per_frame=2;
//MPEG-2 aspect
if(s->aspect_ratio_info > 1){
//we ignore the spec here as reality does not match the spec, see for example
diff --git a/libavcodec/options.c b/libavcodec/options.c
index 1a3c1efd5dc3b222aaec018eb24b33e0c5c692d1..e5a67a48932fa3fa4ee4a2ef14dd8e9bd4e19dcd 100644
--- a/libavcodec/options.c
+++ b/libavcodec/options.c
@@ -393,6 +393,7 @@ static const AVOption options[]={
{"request_channel_layout", NULL, OFFSET(request_channel_layout), FF_OPT_TYPE_INT64, DEFAULT, 0, INT64_MAX, A|D, "request_channel_layout"},
{"rc_max_vbv_use", NULL, OFFSET(rc_max_available_vbv_use), FF_OPT_TYPE_FLOAT, 1.0/3, 0.0, FLT_MAX, V|E},
{"rc_min_vbv_use", NULL, OFFSET(rc_min_vbv_overflow_use), FF_OPT_TYPE_FLOAT, 3, 0.0, FLT_MAX, V|E},
+{"ticks_per_frame", NULL, OFFSET(ticks_per_frame), FF_OPT_TYPE_INT, 1, 1, INT_MAX, A|V|E|D},
{NULL},
};
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 073e6dacdcf59695df14e6273e8d8a796262334f..4d6cb705f98e0e2bcb5b47bc6683e688549e1dfa 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2201,9 +2201,9 @@ int av_find_stream_info(AVFormatContext *ic)
if (!st->r_frame_rate.num){
if( st->codec->time_base.den * (int64_t)st->time_base.num
- <= st->codec->time_base.num * (int64_t)st->time_base.den){
+ <= st->codec->time_base.num * st->codec->ticks_per_frame * (int64_t)st->time_base.den){
st->r_frame_rate.num = st->codec->time_base.den;
- st->r_frame_rate.den = st->codec->time_base.num;
+ st->r_frame_rate.den = st->codec->time_base.num * st->codec->ticks_per_frame;
}else{
st->r_frame_rate.num = st->time_base.den;
st->r_frame_rate.den = st->time_base.num;
@@ -2537,7 +2537,7 @@ static int compute_pkt_fields2(AVStream *st, AVPacket *pkt){
if (pkt->duration == 0) {
compute_frame_duration(&num, &den, st, NULL, pkt);
if (den && num) {
- pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
+ pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
}
}