Ticket #13412: fixTheoraDecoderRate.txt

diff --git a/video/theora_decoder.cpp b/video/theora_decoder.cpp
index b9b57912d30..3edb5800165 100644
--- a/video/theora_decoder.cpp
+++ b/video/theora_decoder.cpp
@@ -169,7 +169,11 @@ bool TheoraDecoder::loadStream(Common::SeekableReadStream *stream) {
        if (_hasVideo) {
                _videoTrack = new TheoraVideoTrack(getDefaultHighColorFormat(), theoraInfo, theoraSetup);
                addTrack(_videoTrack);
-               setRate(_videoTrack->getFrameRate());
+               // Set video speed to 1x
+               // Note: video_decoder's setRate() method does not set frames-per-second rate
+               //       but rather the speed of the playback (eg. 1x, 2x etc, with 1x being normal speed).
+               //       Hence, we do not pass _videoTrack->getFrameRate() as argument to setRate().
+               setRate(1);
        }
 
        th_info_clear(&theoraInfo);