Dvbv5scan Initial File =link= Official

initial scan file dvbv5-scan is a configuration file that provides the scanning utility with a starting set of frequencies and transponder parameters. Instead of blindly scanning the entire frequency spectrum (which takes a long time), dvbv5-scan

reads this file to lock onto a known working transponder, read its Network Information Table (NIT), and automatically discover all other available channels and services on that network. LinuxTV.org 📂 Where to Find Initial Scan Files

Most Linux distributions include these files by default when you install the LinuxTV.org Standard Installation Path: /usr/share/dvbv5/ (or occasionally /usr/share/dvb/ for legacy formats). Sub-folders by Standard:

Inside that directory, files are organized by broadcast standard: (Terrestrial / Antenna) (Satellite) (North American Terrestrial)

If you need the most up-to-date files or your local transmitter is missing, you can find the master community database at the official dtv-scan-tables GitLab/GitHub repository 📝 File Format Structure

Unlike older legacy formats that used a single line of comma-separated values, the modern DVBv5 format uses a highly readable key-value structure. LinuxTV.org Example of a DVB-T (Terrestrial) Initial File:

[Channel] DELIVERY_SYSTEM = DVBT FREQUENCY = 578000000 BANDWIDTH_HZ = 8000000 INVERSION = AUTO GUARD_INTERVAL = AUTO TRANSMISSION_MODE = AUTO HIERARCHY = NONE Use code with caution. Copied to clipboard Example of a DVB-S (Satellite) Initial File: dvbv5scan initial file

[Transponder] DELIVERY_SYSTEM = DVBS FREQUENCY = 12551500 POLARIZATION = VERTICAL SYMBOL_RATE = 22000000 INNER_FEC = 5/6 INVERSION = AUTO Use code with caution. Copied to clipboard ⚙️ How to Use It

To perform a scan using an initial file, reference it at the end of your CLI command. Debian Manpages dvbv5-scan [options] Use code with caution. Copied to clipboard Practical Example:

To scan for over-the-air DVB-T channels in Sydney, Australia, using an initial file and saving the resulting channel list:

dvbv5-scan -o ~/channels.conf /usr/share/dvbv5/dvb-t/au-Sydney Use code with caution. Copied to clipboard

flag instructs the tool to output the discovered services into a new file that you can load into media players like VLC or Kaffeine). Kernel documentation 🛠️ What if I don't have an initial file?

If you cannot find an initial file for your specific city or transmitter, you can generate a fresh one or skip it entirely: Generate one: Use a hardware blind-scan tool like w_scan_cpp to scan your local spectrum and output a compatible file. Use a nearby city: initial scan file dvbv5-scan is a configuration file

Try an initial scan file from a neighbouring region; as long as your receiver can lock onto at least

active transponder frequency, the NIT will populate the rest of the local network automatically. LinuxTV.org generating a custom initial file

Standard Installation Paths

On most Linux distributions, initial files are stored under:

/usr/share/dvb/dvb-t/
/usr/share/dvb/dvb-c/
/usr/share/dvb/dvb-s/
/usr/share/dvb/atsc/

For example:

• /usr/share/dvb/dvb-t/uk-CrystalPalace
• /usr/share/dvb/dvb-c/us-Cable
• /usr/share/dvb/dvb-s/Astra-19.2E

You can also use custom files anywhere on your system.

Understanding the DVBv5-Scan Initial File: A Guide to Channel Scanning in Linux

Digital TV tuning on Linux has evolved significantly with the dvbv5 suite of tools. At the heart of the channel scanning process lies the initial file — a critical yet often misunderstood component. This article explains what the initial file is, how it works, and how to use it effectively. For example:

5. Practical Usage of the Initial File

2. Delivery System Mismatch

Your initial file says DVBT2, but your tuner wants DVBT or DVBC. Check your frontend’s capabilities:

dvb-fe-tool -a 0 -f 0

This shows supported delivery systems. Adjust your initial file’s DELIVERY_SYSTEM accordingly.

What is dvbv5scan?

Before we dive into the initial file, let's briefly set the stage. dvbv5scan is part of the libdvbv5 library and dvb-apps (or its modern replacement, dvb-tools). It is the successor to the older scan utility. dvbv5scan supports newer standards like DVBv5 (which includes DVB-T2 and DVB-S2) and the Satellite Equipment Control (DiSEqC) protocol more robustly than its predecessors.

The command line syntax is straightforward:

dvbv5scan -a <adapter_number> -f <frontend_number>

However, when you run this command without proper preparation, you might see:

ERROR: Cannot find initial file for adapter0/frontend0. Please provide a valid initial file.

This message brings us to the core of our discussion: the initial file.

Key Parameters Explained:

• DELIVERY_SYSTEM: DVBT, DVBT2, DVBC, DVBS, DVBS2.
• FREQUENCY: In Hertz. (Note: For DVB-S, this is the LNB downconverted frequency, typically between 950 MHz and 2150 MHz, not the actual satellite frequency).
• BANDWIDTH_HZ: For terrestrial; usually 6, 7, or 8 MHz.
• MODULATION: QPSK, QAM/16, QAM/64, QAM/256, etc.
• INVERSION: Usually AUTO, but can be OFF or ON.
• SYMBOL_RATE: For cable and satellite (in Symbols per second).