600: Fix mov container getting wrong frame rate (#662)

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Fixes #600 

### Summarize your change.
add fix for mov container files, using avg_frame_rate instead of
time_base

### Describe the reason for the change.
The ffmpeg update causes this issue.

### Describe what you have tested and on which operating system.

Tested on: Windows 10, Centos7, AlmaLinux9
Tested for .mov, .mp4, .mxf (not affected by change)

---------

Signed-off-by: Mirco Tornow <[email protected]>

src/lib/image/MovieFFMpeg/MovieFFMpeg.cpp

@@ -712,6 +712,15 @@ isMP4format(AVFormatContext* avFormatContext)
             && strstr(avFormatContext->iformat->name, "mp4") != nullptr;
 }
 
+bool
+isMOVformat(AVFormatContext* avFormatContext)
+{
+    return avFormatContext!=nullptr 
+            && avFormatContext->iformat!=nullptr 
+            && avFormatContext->iformat->name!=nullptr  
+            && strstr(avFormatContext->iformat->name, "mov") != nullptr;
+}
+
 int64_t
 findBestTS(int64_t goalTS, double frameDur, VideoTrack* track, bool finalPacket)
 {
@@ -1340,7 +1349,12 @@ MovieFFMpegReader::getFirstFrame(AVRational rate)
         AVStream *tsStream = m_avFormatContext->streams[i];
 
         AVRational tcRate = {tsStream->time_base.den,
-                             tsStream->time_base.num};
+                           tsStream->time_base.num};
+
+        if (isMOVformat(m_avFormatContext))
+        {
+            tcRate = tsStream->avg_frame_rate;
+        }
 
         AVDictionaryEntry *tcrEntry;
         tcrEntry = av_dict_get(tsStream->metadata, "reel_name", NULL, 0);
@@ -3621,6 +3635,11 @@ MovieFFMpegReader::decodeImageAtFrame(int inframe, VideoTrack* track)
         AVRational rate = {tsStream->time_base.den,
                            tsStream->time_base.num};
 
+        if (isMOVformat(m_avFormatContext))
+        {
+            rate = tsStream->avg_frame_rate;
+        }
+
         // Correct wrong frame rates that seem to be generated by some codecs
         if ( rate.num > 1000 && rate.den == 1)
         {