Tvheadend

I'm using Tvheadend on ISDB-TB with a USB dongle with great success but for a certain channel: it comprises three transports, one in 1080i, the other in 576i and the third is a low-res version of the 1080i one. The problem is I can get no audio in any transport of that multiplex.
I see Tvheadend seems to misidentify one of the streams in the 1080 transport, the channel includes one AAC audio track and Tvheadend identifies two. I tried to manually edit the transport, but the problem persists.

When tuning to that mux, it takes many seconds for Tvheadend to start displaying fluid video (it first shows a frozen frame).

These problems disappear when using mplayer or VLC, but on MythTV 0.24 the sound glitches every five to ten seconds (again, in the three transports of the mux). On MythTV 0.23 I get no audio at all.

I don't know if this information may be relevant, it's I'm not a programmer and have no knowledge of the inner workings of ISDB nor DVB, but any test you would like me to run, I'll gladly try to do my best.

I'm running Myhtbuntu 11.04 64-bit.