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           **** Audio/Video desynchronisation detected! ****
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This means either the audio or the video is played too slowly.
Possible reasons, problems, workarounds:
- Your system is simply too slow for this file.
     Transcode it to a lower bitrate file with tools like HandBrake.
- Slow video output.
     Try a different --vo driver (--vo=help for a list). Make sure framedrop
     is not disabled, or experiment with different values for --framedrop.
- Playing from a slow network source.
     Download the file instead.
- Try to find out whether audio/video/subs are causing this by experimenting
  with --no-video, --no-audio, or --no-sub.
- If you swiched audio or video tracks, try seeking to force synchronization.
If none of this helps you, file a bug report.