Hi Stomp. The Panasonic 2013 profile is still a work in progress so any comments are best made within that thread.
Having said that, your VT30 is a 2011 device and the better profile to use is the
Panasonic Viera E/S/ST/VT (2011) profile. This will adress some of your issues:
● How can I enable soft subtitles for all video formats? I've enabled subtitles in Serviio console and the video file and subtitles file has same name.
Soft subtitles depends on your TV's capabilities. I
believe (you will need to confirm) that the the VT30 supports embedded subtitles in MKV containers, but not a lot else (not sure about soft subs with MKV's). For MP4's you need to burn them in (enable Burn-in subs, Only when required).
● Aspect ratio is stretched [full-screen] for all videos. I want to set it to 16:9
Come back after you change profiles. MKVs should be played natively so should maintain aspect ratio's. We may have to modify the profile if you are having troubles with MP4's and AVI's. If still an issue, provide
MediaInfo details of the troublesome file.
● For MPEG-4 video files there's no audio.
The VT30 cannot play MP4s with AAC audio natively (the 2013 profile delivers this file natively). If you use the
Panasonic Viera E/S/ST/VT (2011) profile, these files will be remuxed, and the audio converted to AC-3 ie. these files will play once you select the correct profile.
● For some of the mkv files there's strange lag after 5 secs.
Not sure - come back after you change profiles if still an issue. You will need to provide MediaInfo details for the MKV's that are lagging.