Samsung 2015 TV subtitles and blu-ray ISO issue

[iamseungdol]

I bought Samsung 2015 TV (UN50JU6800F) and want to watch my video via mezzmo.
I'm using the profile Samsung H (UHD).

1. subtitles

If I tried to watch my videos via internal TV dlna function, no subtitle delivered.
But controlling my videos and TV via mezzmo android app, I can see subtitle perfectly.
And it's so annoying that launching the app to watch my videos on my TV every single time.
If there is a solution, please give me that.

2. Blu-ray ISOs

Some Blu-ray ISOs streams video perfectly, but not audio.
I think that there is an audio compatibility issue. My TV says 'Not supported audio' (I don't know exact message I'm not using my TV in English)

FFmpeg information:

Program 1
Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x1100]: Audio: pcm_bluray (HDMV / 0x564D4448), 48000 Hz, stereo, s32, 2304 kb/s

If my machine is so powerful, I can turn on on-the-fly transcoding, and problem will be solved. But I can't.
Is there the solution for this issue or the ability that transcode audio only?

Thanks.
Sorry for my poor English.