Add rounding to the time base check

1 files changed, 7 insertions, 3 deletions

diff --git a/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs b/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
index c9885ae76..eb8850cd2 100644
--- a/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
+++ b/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
@@ -724,13 +724,17 @@ namespace MediaBrowser.MediaEncoding.Probing
                 stream.RealFrameRate = GetFrameRate(streamInfo.RFrameRate);
 
                 // Some interlaced H.264 files in mp4 containers using MBAFF coding aren't flagged as being interlaced by FFprobe,
-                // so for H.264 files we also check if the codec timebase duration is half the reported frame rate duration to
-                // determine if the file is interlaced
+                // so for H.264 files we also calculate the frame rate from the codec time base and check if it is double the reported
+                // frame rate (both rounded to the nearest integer) to determine if the file is interlaced
+                float roundedTimeBaseFPS = MathF.Round(1 / GetFrameRate(stream.CodecTimeBase) ?? 0);
+                float roundedDoubleFrameRate = MathF.Round(stream.AverageFrameRate * 2 ?? 0);
+
                 bool videoInterlaced = !string.IsNullOrWhiteSpace(streamInfo.FieldOrder)
                     && !string.Equals(streamInfo.FieldOrder, "progressive", StringComparison.OrdinalIgnoreCase);
                 bool h264MbaffCoded = string.Equals(stream.Codec, "h264", StringComparison.OrdinalIgnoreCase)
                     && string.IsNullOrWhiteSpace(streamInfo.FieldOrder)
-                    && 1f / (stream.AverageFrameRate * 2) == GetFrameRate(stream.CodecTimeBase);
+                    && roundedTimeBaseFPS == roundedDoubleFrameRate;
+
                 if (videoInterlaced || h264MbaffCoded)
                 {
                     stream.IsInterlaced = true;