stuttering blu-ray

pdasterly wrote:
custom chipset, designed for 4k.

That doesn't change my assessment.

There are a lot of broken bitstreams floating around. Sometimes it's because errors creep in while it is distributed, and sometimes it's a bug in a freeware encoder. Sometimes it's because an end-user doesn't understand what the settings they are using do.

Chip manufacturers use compliance suites to test their chip sets. If they are given a bitstream that is not compliant, then bad results often occur. From their point of view, those bad results are not their problem.

It's usually easier to work around these problems if you have a software decoder.

Note I am not saying your particular problem is a bad bitstream (though it could be I guess). I am just responding to TonV's comment that stuttering is often due to a "bottleneck". I've seen clear evidence of performance bottlenecks with some early sigma chipsets years ago, but not recently.