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There are a large number of Roku devices available. The original device was released in 2008, with many different versions released since then. There are also televisions that use the Roku OS for their core functions, which offer a similar user experience compared to a Roku player, with the addition of viewing broadcast TV.
Around 2016, Roku devices used more powerful processors, and 4K also became available. Beginning with the 6th generation devices, MPEG-2 video support was added to the players. Roku TVs have always supported MPEG-2 video, as that is the Digital TV standard (ATSC 1.0) for North America.
Roku devices only support a limited number of video and audio codecs, as well as only a few containers. You can view this page for more detailed information. But in general, the video must be the H.264/MP4/AVC codec, with H.265 for the 4K devices and MPEG-2 for 6th generation and newer devices. For audio, the codec must be AAC/PCM (stereo only)/AC3. DTS is supported only as a passthough bitstream from MKV files. As for containers, MKV, MP4 or MOV is officially listed, but TS containers (.TS, .M2TS) are also supported.
The first Roku profile (named “Roku Media Player”) included with Serviio is designed to support the earlier players. These players had a bit rate limit of around 16 Mbps, so any HD media most likely needed to be rate-limited. By default, this is always the profile assigned by Serviio to any Roku device. If your Roku is new enough to support higher bit rates and additional codecs, you must manually select a more appropriate profile from the list below.