Sound echo in Quicktime 10.1

Hi,
I just received a video from a supplier. Here's the information:
Apple ProRes 422 (HQ), 1 920 x 1 080 (1 888 x 1 062)
Apple ProRes 422 (HQ), 1 920 x 1 080 (1 888 x 1 062)
Apple ProRes 422 (HQ), 1 920 x 1 080 (1 888 x 1 062)
Apple ProRes 422 (HQ), 1 920 x 1 080 (1 888 x 1 062)
PCM linéaire, 16 bit petit boutien entier signé, 1 canaux, 48000 Hz
PCM linéaire, 16 bit petit boutien entier signé, 1 canaux, 48000 Hz
The stereo sound is on two tracks.
The sound is playing with an echo in Quicktime 10.1 but is fine in NicePlayer. VLC lag with ProRes too much to test.
Anyone knows why Quicktime had this echo problem?
Thanks ofr help

I noticed I have the same problem too (sometimes) if a movie has two audio tracks. Quicktime acts as if its playing both stereo and surround at the same time.
If you go to the Quicktime Menu > View > Languages , then select one of the audio tracks, the echo will go away.

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