Jedan solidan video player koji automatski učitava titlove..Ono što sam isprobao radi ok..Zove se CCplayer, ima free i pay varijanta (6 kn, ali bez reklama)..

CCPlayer | Windows Phone Trgovina aplikacija i igara (Hrvatska)

Supports all video / audio formats supported by Windows Phone.
It also supports MKV, and FLV formats.

[Codec supported]
1. All codecs are supported by default in Windows Phone, MP4/AVI/WMV/ASF, etc.
2. MKV container: H264 video codec, AAC / FLAC / MP3 / PCM audio codec
3. FLV container: H264 video codec, AAC / MP3 / PCM audio codec

[Features]
1. List and add subtitles
2. Subtitles speed control (except with internal MKV subtitles)
3. Styles of subtitle
4. Change encoding subtitles during playback
5. Adjusting the brightness
6. Adjusting the volume, balance
7. Multiple audio support (FLV not, be changed during playback)
8. Video speed adjustment (MKV, FLV excluded)
9. Play List (list of continuous playback)
10. Playing history (previous play position memory)
11. All video and folder navigation
[ver 1.1.9]
Supported touch gestures. (audio volume & brightness adjustment)