AVS Forum Special Member
Join Date: Jan 2003
Location: Portland, Oregon, USA
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For micro-stutter, we have seen this sometimes be due to HDMI cabling. However, it can also be frame drops or repeats due to the mismatch being input and output rate as bobof suggests.
Video content really should be 23.98 or 59.94, and not 24.00 or 60.00. To eliminate output restarts going form 60.00 (OSD) to 59.94 (Content), our direct commands for 4k output turn "Rate Match" to Off. While 60.00 is a legal video rate, I consider it a mistake for any consumer content as it runs against defacto usage which is either 59.94 or 23.98 Hertz.
Unfortunately if sources are outputting video content a 24.00 and/or 60.00, and the drops/repeats bother you, you need to set "Rate Match" = On, to reduce the number of dropped frames.
If you have not used a direct output mode code (MENU 087X) to manually set the output you can change this in the active output style (MENU Output Styles Styles0 HDMI Format Rate Match by default). However, if you have used one of the direct output mode codes (MENU 087X), the Rate Match is forced off and you need to undo the command with MENU 0870, and a Save. Then you would set the output rate using the Menu. Please note I am talking to Patrick about either new manual output mode command that do not turn off Rate Match, or a way to again enable Rate Match after using a MENU 087X manual output mode code.
The only way to completely eliminate the frame drops and repeats completely is to turn on Genlock for the rate(s) you notice with the "micro stutter." If you still see the frame drops/repeats with Rate Match = On, then you should try Genlock on using MENU Input Options Genlock (Off, Auto24-Normal, Auto24-Fast, Auto-Normal, Auto-Fast, command. Frame drops/repeats are more noticeable at 23.98 Hertz. If you do not notice them at 59.94 Hertz, try Auto24-Normal, and if you do notice them at 59.94 Hertz try Auto-Normal.
Genlock should eliminate the frame drops/repeats, but be aware of the following:
- If a 60.00 source is active and "Rate Match" is Off, the output is 59.94. Genlock will not lock on in this case, and so it will be disabled due to this small, but significant, difference.
- Genlock increases switching time. If you have a projector with a long lock on time (most do it seems), this will be a very noticeable increase.
- I recommend having one memory with Genlock Off (e.g. MEMA), and a second with Genlock On (e.g. MEMB). Then you can switch and channel surf as before using MEMA. Then when you get to a program you want to enable Genlock for, press Pause, then switch to MEMB, wait for the picture to return, then press Play.
- For sources that are mostly used for 24 Hertz content like Bluray players, I suggest you consider using the Radiance Pro's Output Setup Menu to program a Output Style for that specific input to always outputs 24/23.98. I program our Radiance Pro this way for our Oppo 203, and our Strato, players. Since I am always starting and stopping content this means I pay the projector HDMI restart time when I first select that input.
- If you have an Oppo 203, I suggest you consder programming the OSD to always output at 24 Hertz if you are like me and use it to view movie content. This allows the movie to start without changing the rate out of the player to the Pro.