Why might VLC be able to display subs well but my Blu-ray player doesn't?

[rednascarcars]

To give context, I've been tinkering with multiAVCHD for a little bit (it's still having trouble detecting avisynth but that's neither here nor there) and I use VLC's disk option to test the output. They were originally .ass subtitles that I converted using sub2bd and only those subtitles are left in the final output. My blu ray player might have the wrong coloring (i.e. seem nearly transparent) during the opening and ending themes. Also, if there are multiple subs on the screen at the same time (dialogue and visual translation), everything gets screwed up; not only are there troubles displaying the visual translation, the dialogue gets offset (but will fix itself after some time). There were even times that my blu ray player would crash (power off) or eject the disk. Needless to say, I'm at a complete loss for words.

I'll add a few more details. First, I'll clarify that if it's just stanard dialogue, nothing goes wrong on my player. Also, it's not that VLC displays the subs flawlessly either; when I check the scenes that gave my player crashing/ejecting problems, VLC seems to ignore the graphics since they're not shown, but otherwise the subs are correct to the source (like during themes, etc). Speaking of the source, I went to one episode I remember having issues and the subs in the problem scene are "flickering" in VLC. maybe it's just an overload/overflow and I should just remove the lines relating to it before converting? That wouldn't be ideal though, since that doesn't "fix" anything, just dodging the problem. The blu ray player, btw, is just the standard philips model you'd find at a walmart or best buy. If it's as simple as a player issue I wouldn't mind changing or upgrading, but only if there are no other solutions that work.

Could someone offer any tips on how I might be able to proceed, or what some potential underlying issues may be? Would it be helpful for me to attach anything later, such as my original and outputted subtitles in a zip?

[cibo]

Because multiAVCHD, easySUP, sub2bd & co. are all based on avs2bdnxml which does not produce a correct PG datastream. Unlike your PC executing FFmpeg, Blu-ray players must be affordable to the customer. they implement decoders at a very low level in an integrated circuit ("System-on-Chip"). The decoders feature failsafes but still expect somewhat correct input data. It's not the job of the decoder to support any type of garbage coming in: this garbage should not exist in the first place. FFmpeg can afford to have all types of guards and does not have the same constraints as a Disc player.

Anyway, just use a software that produce correct encodes: SUPer

Blame the admins for keeping broken software in the site recommendations.