Refer to the following Screenshot.
Screenshot 1. Disable internal H264/AVC1 decoder
Screenshot 2. Add CoreAVC to external H264/AVC1 decoder
CoreAVC is not a free decoder and it must be properly installed in your system at first. And then, press the button "External Decoder Search" in the second screenshot below and "Add after Scan". CoreAVC will be appeared in the list if it is installed in your system.
After configuring, you can confirm the operation by Tab or Ctrl-Tab info box when playing H.264 videos.
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