try to guess the fps if they are variable

Originally committed as revision 3760 to svn://svn.ffmpeg.org/ffmpeg/trunk

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;

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)

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 ||