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Serious frame drops on MKV/AC3 movies


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I am experiencing serious frame drops on several movies when played on any of my Roku3 devices. 

Movies are played directly (without transcoding) but the image has little movement: it seems a sequence of stills with a lot of frames dropped in between them.


Same movies play fine on Windows 8 app (direct play) and on Chrome browser (transcoded).


This does not occur with all movies, so I did lots of tests to better determine the scenario (e.g.: codecs) that causes this phenomenon.


The common factors to every movie with this problem are:

Container: MKV

Audio: AC3


AVIs with AC3 audio streams are not problem as they all get transcoded.


I disabled AC3 (DD) passthrough on the Roku configuration. This setup made MKVs with AC3 audio streams to be transcoded. As they are transcoded they play fine with no jitter/frame drops.



This is, though, no solution: disabling AC3 also disables DTS and thus all movies are transcoded resulting on only on 2 audio channels.


I suspect this problem relates to Roku's new firmware as these movies used to play fine on same Rokus.

So if anybody could just test MKVs/AC3 on a Roku and share the result it would be very good.


My setup is as it follows:

MB Server version: 3.0.5518.7

Roku app version: 1.87

Roku firmware version: 6.1 build 5604

Edited by EduardoSantos
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