lavf: use dts difference instead of AVPacket.duration in find_stream_info()

AVPacket.duration is mostly made up and thus completely useless, this is
especially true for video streams.
Therefore use dts difference for framerate estimation and
the max_analyze_duration check.

The asyncts test now needs -analyzeduration, because the default is 5
seconds and the audio stream in the sample appears at ~10 seconds.

1 files changed, 9 insertions, 1 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 7c97ada2c8..0e50487414 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -718,9 +718,17 @@ typedef struct AVStream {
         int64_t duration_gcd;
         int duration_count;
         double duration_error[MAX_STD_TIMEBASES];
-        int64_t codec_info_duration;
         int nb_decoded_frames;
         int found_decoder;
+
+        /**
+         * Those are used for average framerate estimation.
+         */
+        int64_t fps_first_dts;
+        int     fps_first_dts_idx;
+        int64_t fps_last_dts;
+        int     fps_last_dts_idx;
+
     } *info;
 
     int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */