I’m not sure if Clarkdale has

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March 30, 2012 at 8:31 pm #7041
Aaron Ledger

    I’m not sure if Clarkdale has been fixed to allow 23.976 Hz when 23 Hz is selected. When I used to have a Clarkdale board, this was not a reality.

    TMT5 will use the desktop refresh rate setting. If the desktop supports 24p, some versions of TMT5 will change the rate to 23/24 Hz depending on version and source material and then change back to the desktop refresh rate when it is finished.

    Your TV may not support 24p at all or it may support it in at least a couple of ways. If your TV accepts 24p input, it may simply telecine to 59.94 Hz. This is common on lower-tier TVs for the past few years. Many TVs also now support “proper” 24p playback which means playing the 24p frames in an even cadence.

    There can be many causes of “judder”. First, there is telecine judder (AKA pulldown judder). This is when 24p material is displayed with uneven cadence. You may or may not notice this and is also more apparent in certain types of scenes. Second, there is a specific issue with Intel graphics that may exist in some circumstances where 23Hz is selected, but the hardware actually displays at 24Hz which creates a repeated frame about every 45 sec. or so which may or may not be noticeable depending on content. Third, there is a specific issue with TMT5 where some versions select 24Hz even if 23Hz setting is available. It is probably best to rule out the above causes and then see if there is some other cause.