From 15bc38e57c46a806162fa8899bf9de06db12b7eb Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 19 Dec 2004 01:23:22 +0000
Subject: [PATCH] try to guess the fps if they are variable
Originally committed as revision 3760 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
ffmpeg.c | 9 ++++-----
libavformat/flvdec.c | 10 ++--------
libavformat/utils.c | 23 +++++++++++++++++++++++
3 files changed, 29 insertions(+), 13 deletions(-)
diff --git a/ffmpeg.c b/ffmpeg.c
index abf90ef6a5b..38191689106 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -2881,14 +2881,13 @@ static void opt_input_file(const char *filename)
if(me_threshold)
enc->debug |= FF_DEBUG_MV;
- assert(enc->frame_rate_base == rfps_base); // should be true for now
- if (enc->frame_rate != rfps) {
+ if (enc->frame_rate != rfps || enc->frame_rate_base != rfps_base) {
if (verbose >= 0)
- fprintf(stderr,"\nSeems that stream %d comes from film source: %2.2f->%2.2f\n",
- i, (float)enc->frame_rate / enc->frame_rate_base,
+ fprintf(stderr,"\nSeems that stream %d comes from film source: %2.2f (%d/%d) -> %2.2f (%d/%d)\n",
+ i, (float)enc->frame_rate / enc->frame_rate_base, enc->frame_rate, enc->frame_rate_base,
- (float)rfps / rfps_base);
+ (float)rfps / rfps_base, rfps, rfps_base);
}
/* update the current frame rate to match the stream frame rate */
frame_rate = rfps;
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 48d1719c5c2..3664f8a024b 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -103,7 +103,8 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
return AVERROR_NOMEM;
av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
- st->codec.frame_rate_base= 0;
+ st->codec.frame_rate_base= 1;
+ st->codec.frame_rate= 1000;
}
break;
}
@@ -123,19 +124,12 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
}
}
}else{
- if(st->codec.frame_rate_base == 0){
st->codec.codec_type = CODEC_TYPE_VIDEO;
- //guess the frame rate
- if(pts){
- st->codec.frame_rate_base=1;
- st->codec.frame_rate= (1000 + pts/2)/pts;
- }
switch(flags & 0xF){
case 2: st->codec.codec_id = CODEC_ID_FLV1; break;
default:
st->codec.codec_tag= flags & 0xF;
}
- }
}
if (av_new_packet(pkt, size) < 0)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index da5348644f8..efed2e41dec 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -1726,7 +1726,14 @@ int av_find_stream_info(AVFormatContext *ic)
AVStream *st;
AVPacket pkt1, *pkt;
AVPacketList *pktl=NULL, **ppktl;
+ int64_t last_dts[MAX_STREAMS];
+ int64_t best_duration[MAX_STREAMS];
+ for(i=0;i<MAX_STREAMS;i++){
+ last_dts[i]= AV_NOPTS_VALUE;
+ best_duration[i]= INT64_MAX;
+ }
+
count = 0;
read_size = 0;
ppktl = &ic->packet_buffer;
@@ -1792,6 +1799,15 @@ int av_find_stream_info(AVFormatContext *ic)
if (pkt->duration != 0)
st->codec_info_nb_frames++;
+ if(st->codec.codec_type == CODEC_TYPE_VIDEO){
+ int64_t last= last_dts[pkt->stream_index];
+
+ if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && last < pkt->dts &&
+ best_duration[pkt->stream_index] > pkt->dts - last){
+ best_duration[pkt->stream_index] = pkt->dts - last;
+ }
+ last_dts[pkt->stream_index]= pkt->dts;
+ }
/* if still no information, we try to open the codec and to
decompress the frame. We try to avoid that in most cases as
it takes longer and uses more memory. For MPEG4, we need to
@@ -1823,6 +1839,13 @@ int av_find_stream_info(AVFormatContext *ic)
if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
if(st->codec.codec_id == CODEC_ID_RAWVIDEO && !st->codec.codec_tag && !st->codec.bits_per_sample)
st->codec.codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec.pix_fmt);
+
+ if(best_duration[i] < INT64_MAX && st->codec.frame_rate_base*1000 <= st->codec.frame_rate){
+ st->r_frame_rate= st->codec.frame_rate;
+ st->r_frame_rate_base= av_rescale(best_duration[i], st->codec.frame_rate, AV_TIME_BASE);
+ av_reduce(&st->r_frame_rate, &st->r_frame_rate_base, st->r_frame_rate, st->r_frame_rate_base, 1<<15);
+ }
+
/* set real frame rate info */
/* compute the real frame rate for telecine */
if ((st->codec.codec_id == CODEC_ID_MPEG1VIDEO ||
--
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