Gapless playback of FLAC files.

During the pandemic I got JRiver and played with all types "renderers". DVD players, Blueray players, Sonos speakers TVs etc. With JRiver I can see a variety of details at the renderer level which is key. A very large amount of my music is gapless.

My results are simply that the regular DVD/Blueray players are quite unreliable in this regard with none being solid. I even did the same with a relatively new Sansung TV and while no gapless but it also resampled everything to 16 bit no matter. One TV actually reversed the channels when uses as a renderer. 

So despite what should be a super simple job to achieve I purchased a real audio streamer which of course does gapless and other things they way they should be done for an audio user. 

What are you hoping to gain with gapless playback? I intentionally set my streamer to add 3 second delay to allow my DAC to adjust between resolutions. 

I'm a little curious, what do you mean?  You stick a USB drive in the back of the player?

You only gain something from gapless playback if two or more tracks are intended to play with no interruption at all. A brief silence ruins this effect.

If I use a computer as transport, the only way I can connect to my dac is with USB. My blue-ray player allows for a spdif, hdmi, or toslink connection cable.

Where does the blue-ray player get the flac files from? Where are they stored?