Currently, There are three drivers that support ISDB-T: dibcom dib0700 and pt1 driver, and commercially bundled drivers for Empia solutions.
The dib0700 implements the new DVBS2API to allow finer control at the ISDB-T parameters.
The Empia/Sundtek based Linux USB solutions support both, S2-API as well as the Legacy DVBv3 API and also include backward compatibility for ~4 year old Linux systems which are currently on the market, an installation does not require any recompilation and usually can be done within seconds due to the kernel independency. They also provide a player with channel scanning ability which supports H264/AAC as well as multiple character sets.
How to make it work with the current dvb-apps version
Some changes are needed at dvb-apps in order to support the new DVBS2API parameters for ISDB-T. While those changes aren't implemented there and at the userspace apps, you need to use the DVB-T format.
In the case of ISDB-T, the current implementations (Brazil and Japan) use 6 MHz bandwidth with the same ISDB-T Frequency Table. In the future, this is likely to change.
For the device to work, the first step is to seek for the existing channels. This is done by running the 'scan' application:
scan FrequencyTable >channels.conf