Changes in rBce649c73446e, affected established proxy codec preset.
Presets were not working and all presets were similar to veryfast.
Tunes are now working too, so fastdecode tune can be used. I have
measured little improvement, but I tested this only on 2 machines and
I have been informed that fastdecode tune does influence decoding
performance for some users.
Change preset from slow to veryfast and add tune fastdecode