Backend
MythTV Detailed Backend Configuration v. 0.18.1. (Incomplete)
MythTV Backend
The backend process (mythbackend) is the portion of the system that handles the Video Capture Cards as well as Scheduling Recordings on those cards, Commercial Flagging, and transcoding. The backend process interacts with the Database primarily.
As with the MythFrontend, there can be multiple backends. One backend process is designated as the master backend. This is usually the first backend installed on a system. This backend is responsible for coordinating the activities of the other backends known as slaves. This is especially true for scheduling as the master backend will determine the best distribution of programs across all available tuners. Each backend can have any number of tuners, including zero. As of 0.16, Commercial Flagging can be distributed across different backends, thereby spreading the load of that process.
There is no requirement for direct user interaction with the backend. The backend can use local HardWare/File Storage or have it mounted from another system. If remotely mounted, network performance should be considered as there will be considerable traffic on the network as recordings are stored and retreived by the backend process.
Communications Protocol
The backend and frontend communicate using their own Myth Protocol. The developer of Win Myth, a windows frontend to MythTV for playing recordings on Windows, has documented his workings on the procotol here. Work on defining the Myth Protocol is also be performed on this Wiki.
Backend Configuration
The MythTV Backend configuration has two main objectives
- Tell MythTV what TV Capture/Tuner cards to use
- Populate the Myth Database with information about channels and tuning information
There are additional items that can be configured, but without successfully achieving the above two steps you will not be able to get Live TV.
Once configuration is done you can test to see if the mythbackend process is running correctly by starting it in a Terminal window:
> mythbackend
Watch out for any error messages.
Backend Reference
Host Address Backend Setup
IP address for mythtv
Default Setting
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PUT IN THE DEFUALT HERE
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On Page Description
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Detailed Description and Comments
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Port the server runs on:
Default Setting
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On Page Description
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Port the server shows status on:
Default Setting
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On Page Description
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Master Server IP address:
Default Setting
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On Page Description
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Port the master server runs on:
Default Setting
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On Page Description
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Detailed Description and Comments
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Host-specific Backend Setup
Directory to hold recodings:
Default Setting
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PUT IN THE DEFUALT HERE
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On Page Description
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Detailed Description and Comments
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Directory to hold the Live-TV buffers:
Default Setting
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PUT IN THE DEFUALT HERE
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On Page Description
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Detailed Description and Comments
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Live TV Buffer (GB):
Default Setting
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On Page Description
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Minimum free Live TV Buffer:
Default Setting
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On Page Description
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Save original files after transcoding
Default Setting
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On Page Description
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Detailed Description and Comments
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Global Backend Setup
TV format:
Default Setting
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On Page Description
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VBI format:
Default Setting
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On Page Description
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Detailed Description and Comments
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Channel frequency table:
Default Setting
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On Page Description
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Time offset for XMLTV listings:
Default Setting
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PUT IN THE DEFUALT HERE
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On Page Description
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Master Backend Override
Default Setting
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On Page Description
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Follow Symbolic links when deleting files
Default Setting
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On Page Description
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Detailed Description and Comments
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Shutdown/Wakeup Options
Block Shutdown before client connected
Default Setting
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On Page Description
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Detailed Description and Comments
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Idle timeout (secs):
Default Setting
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On Page Description
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Max wait for recording (min):
Default Setting
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On Page Description
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Startup before rec. (secs):
Default Setting
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On Page Description
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Wakeup time format:
Default Setting
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On Page Description
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Set wakeuptime command
Default Setting
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On Page Description
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Server halt command:
Default Setting
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On Page Description
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Detailed Description and Comments
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Pre Shutdown check-command:
Default Setting
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PUT IN THE DEFUALT HERE
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On Page Description
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Detailed Description and Comments
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WakeOnLan settings
MasterBackend
Reconnect wait time (secs):
Count of reconnect tries:
Wake Command
Wake command for slaves:
Job Queue (Host-Specific)
Maximum simultaneous jobs on this backend:
Run Jobs only on original recording host
Job Queue Check frequency (in seconds)
CPU Usage
Allow Commercial Detection jobs
Allow User Job #1 jobs
Allow User Job #2 jobs
Allow User Job #3 jobs
Allow User Job #4 jobs
Job Queue (Job Commands)
User Job #1 Description:
User Job #1 Command:
User Job #2 Description:
User Job #2 Command:
User Job #3 Description:
User Job #3 Command:
User Job #4 Description:
User Job #4 Command: