A tool to convert multiple VBR single-program DVB transport streams to a CBR multi-program transport stream suitable for feeding to a DVB modulator.
dvb2dvb was designed to integrate tvheadend (http://tvheadend.org) with a IT9507-based USB DVB-T modulator. It allows you to read multiple TV and radio channels from one or more tvheadend servers (via http streaming) and to output those channels as a single DVB-T multiplex.
Full metadata (channel names, channel numbers (LCNs) and EIT (now/next)) are included in the output stream.
It has been tested with the Linux driver and "sendts" example application available at
https://github.com/linuxstb/it9507/
The DVB-T modulator is available to purchase here:
http://www.idealez.com/hides/product-detail/en_US/69859
The input streams must contain as a minumum the PAT, PMT and SDT tables. These are rewritten by dvb2dvb, which also adds a new NIT. EIT (present/following) is rewritten and passed through to the output stream if it is available in the input streams.
The input streams are multiplexed to a single output stream based on the PCRs, which must be present in the input streams. These are sometimes contained within the video PID, but are often transmitted in their own PIDs.
A recent (November 2014 or later) git master version of tvheadend using the "passthrough" output format will generate suitable streams to be used with dvb2dvb.
Encrypted streams are fully supported by dvb2dvb, assuming they can be descrambled by tvheadend. dvb2dvb will remove all CA-related descriptors and flags from the streams, so they appear as FTA services to the DVB-T receiver.
Just type "make" in the source code directory. Two libraries are required - pthreads and libcurl.
dvb2dvb is still under development. The basic functionality is working but the stream output parameters are not user-configurable and the code is not stable or resilient to errors in the input streams.
./dvb2dvb url1 url2 url3 ... | sendts
The target bitrate is currently hardcoded near the top of dvb2dvb.c as follows:
#define TARGET_BITRATE 31668318
This must be the bitrate output by your version of sendts (which outputs the target bitrate based on the DVB-T parameters). 31668318 (31.668Mbits/s) is the maximum possible with DVB-T.
You can typically stream about 7 SD channels in this bitrate. Note that undefined behaviour will happen if the total combined bitrate of the input streams exceed this rate at any time.
The other values you may wish to change are the NEW_ONID and NEW_TSID values in dvb2dvb.h, the start values for the new service IDs and LCNs in dvb2dvb.c:main(), and the values written in the terrestrial_delivery_descriptor in create_psi.c:create_nit().
These values will all be user-configurable in the future.
dvb2dvb is (C) 2014 Dave Chapman.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.