avformat/utils: Search harder for missing stream information in flv by default

Fixes Ticket4133
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/utils.c

@@ -2989,6 +2989,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
     int orig_nb_streams = ic->nb_streams;
     int flush_codecs;
     int64_t max_analyze_duration = ic->max_analyze_duration2;
+    int64_t max_stream_analyze_duration;
     int64_t probesize = ic->probesize2;
 
     if (!max_analyze_duration)
@@ -2999,11 +3000,12 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
 
     av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
 
+    max_stream_analyze_duration = max_analyze_duration;
     if (!max_analyze_duration) {
-        if (!strcmp(ic->iformat->name, "flv") && !(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
-            max_analyze_duration = 10*AV_TIME_BASE;
-        } else
-            max_analyze_duration = 5*AV_TIME_BASE;
+        max_stream_analyze_duration =
+        max_analyze_duration        = 5*AV_TIME_BASE;
+        if (!strcmp(ic->iformat->name, "flv"))
+            max_stream_analyze_duration = 30*AV_TIME_BASE;
     }
 
     if (ic->pb)
@@ -3076,6 +3078,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
     count     = 0;
     read_size = 0;
     for (;;) {
+        int analyzed_all_streams;
         if (ff_check_interrupt(&ic->interrupt_callback)) {
             ret = AVERROR_EXIT;
             av_log(ic, AV_LOG_DEBUG, "interrupted\n");
@@ -3115,7 +3118,9 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
                  st->codec->codec_type == AVMEDIA_TYPE_AUDIO))
                 break;
         }
+        analyzed_all_streams = 0;
         if (i == ic->nb_streams) {
+            analyzed_all_streams = 1;
             /* NOTE: If the format has no header, then we need to read some
              * packets to get most of the streams, so we cannot stop here. */
             if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
@@ -3223,7 +3228,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
                 && st->info->fps_last_dts  != AV_NOPTS_VALUE)
                 t = FFMAX(t, av_rescale_q(st->info->fps_last_dts - st->info->fps_first_dts, st->time_base, AV_TIME_BASE_Q));
 
-            if (t >= max_analyze_duration) {
+            if (t >= (analyzed_all_streams ? max_analyze_duration : max_stream_analyze_duration)) {
                 av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds\n",
                        max_analyze_duration,
                        t);