diff --git a/src/AvTranscoder/properties/VideoProperties.cpp b/src/AvTranscoder/properties/VideoProperties.cpp
index 9d8e2378..97b8f4e1 100644
--- a/src/AvTranscoder/properties/VideoProperties.cpp
+++ b/src/AvTranscoder/properties/VideoProperties.cpp
@@ -432,7 +432,12 @@ int VideoProperties::getLevel() const
float VideoProperties::getFps() const
{
- return av_q2d(_formatContext->streams[_streamIndex]->avg_frame_rate);
+ if(! _formatContext)
+ throw std::runtime_error("unknown format context");
+
+ if(_formatContext->streams[_streamIndex]->avg_frame_rate.den)
+ return av_q2d(_formatContext->streams[_streamIndex]->avg_frame_rate);
+ return av_q2d(av_inv_q(getTimeBase()));
}
float VideoProperties::getDuration() const
diff --git a/src/AvTranscoder/properties/VideoProperties.hpp b/src/AvTranscoder/properties/VideoProperties.hpp
index a5a2c9a6..27b6d0c5 100644
--- a/src/AvTranscoder/properties/VideoProperties.hpp
+++ b/src/AvTranscoder/properties/VideoProperties.hpp
@@ -64,6 +64,7 @@ class AvExport VideoProperties : public StreamProperties
/**
* @brief Corresponds to the 'fps' returned by ffprobe.
+ * @note If the average framerate is not defined in the format, return the tbn.
* fps = the average framerate that has come from the AVStream
* tbn = the time base in AVStream that has come from the AVStream
* tbc = the time base in AVCodecContext for the codec used for a particular stream
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