Serviio

Just setting up Serviio for the first time and experiencing a problem with some videos only playing audio (no video). Here's the configurations and components of the system. I'm testing to get this to work, if I can, then I'll buy the full versions.

Server
Windows 7 64bit Ultimate, latest versions/updates.
Serviio v1.4.1.2 (Free)

Samsung Phone
Android 4.3 (Verizon)
Bubbleupnp v2.0.8.2 (Free)
I've tried a variety of players, all behave the same. I have MP4 and MKV files. Almost all files play with the exception of some MP4 files which play only audio, no video. As far as i can tell, they are all configured the same.
Players include:
- MX Player v1.7.31
- EX Media Player v3.2.0
- Bubbleupnp Built in Player (to Chromecast - which is where I'm ultimately trying to make work)

I've used Handbrake to RIP most of the MKV files (Codec-H.264, Audio-AAC).
I've upgraded to WinX DVD for rip/copy. Using WINX DVD v7.5.7 to rip. Output MP4 (Codec-H.264, Audio - AAC)

Some are working some are not...which makes me suspect some of the files must have the wrong codec? Anyway to test a file to determine what codec is used?

Its called ffmpeg.. search the forum and wiki or see my How tos below..
What profile are you using for those devices?