MP4s and Panny V10

Has anyone got a profile they know works with a Viera V10? AVIs play perfectly, but MP4s refused to play at all. A small edit of the Viera profile:
<Transcoding>
<!-- remux DTS/FLAC/LPCM in MKV/MP4 to AC3 -->
<Video targetContainer="mpegts" targetVCodec="mpeg2video" maxVBitrate="17000" targetACodec="ac3" aBitrate="192">
<Matches container="matroska" vCodec="h264" aCodec="dca" />
<Matches container="matroska" vCodec="h264" aCodec="flac" />
<Matches container="matroska" vCodec="h264" aCodec="vorbis" />
<Matches container="mp4" />
<Matches container="3gp" vCodec="h264" />
</Video>
now makes the video work, if a little stretched, but still no audio. Just wondering if anyone had any ideas. I've had a look in the wiki and the V10 isn't listed there with a list of supported formats, so tried the Intel UPnP tools to try and interrogate the TV myself, but it doesn't appear in the list; thinking the TV might be too old to support UPnP, but might be wrong.
<Transcoding>
<!-- remux DTS/FLAC/LPCM in MKV/MP4 to AC3 -->
<Video targetContainer="mpegts" targetVCodec="mpeg2video" maxVBitrate="17000" targetACodec="ac3" aBitrate="192">
<Matches container="matroska" vCodec="h264" aCodec="dca" />
<Matches container="matroska" vCodec="h264" aCodec="flac" />
<Matches container="matroska" vCodec="h264" aCodec="vorbis" />
<Matches container="mp4" />
<Matches container="3gp" vCodec="h264" />
</Video>
now makes the video work, if a little stretched, but still no audio. Just wondering if anyone had any ideas. I've had a look in the wiki and the V10 isn't listed there with a list of supported formats, so tried the Intel UPnP tools to try and interrogate the TV myself, but it doesn't appear in the list; thinking the TV might be too old to support UPnP, but might be wrong.