Sony Android TV 6.0.1 – External player can not open files from SMB

I have my files on a Qnap NAS (SMB share) and i want kodi to play video files over the sony video player.

My settings:

Code:
<playercorefactory>
        <players>
                <player name="Video" type="ExternalPlayer" audio="false" video="true">
                        <filename>com.sony.dtv.osat.video</filename>
                        <hidexbmc>true</hidexbmc>
                        <playcountminimumtime>120</playcountminimumtime>
                </player>
        </players>
        <rules action="prepend">
                <rule video="true" player="Video"/>
        </rules>
</playercorefactory>

I think the code is ok, because i can play the same files over USB, but not over network. Kodi tries to open the video file, shows for a second a black screen and then shows the file window.
Using EsFileExplorer or other file manager to open files on network and playing over sony player works always.

Can someone give me a hint how to get it working? I will add log later.