mythtvfs - Online in the Cloud

PROGRAM:

NAME

mythtvfs - a FUSE filesystem for accessing and managing MythTV recordings

SYNOPSIS

mythtvfs [-h|--help]
mythtvfs [-V|--version]
mythtvfs [options] -o host=BACKEND ORIGPATH MOUNT

"BACKEND" is the hostname of the MythTV backend system

"ORIGPATH" is the path to MythTV's recordings directory

"MOUNT" is a location to mount the new FUSE filesystem mythtvfs will establish.

Options:

-h, --help prints a help message and exits
-V, --version prints the version and exits
-d, -o debug enable debug output (implies -f)
-f foreground operation
-s disable multi-threaded operation
-o host=HOST MythTV backend hostname
-o port=PORT MythTV backend port number
-o format=FORMAT format to use for filename
-o date_format=FORMAT format to use for date fields (i.e. airdate)
-o datetime_format=S format to use for date+time fields (i.e. start)
-o short-display shorter filename display format
-o logfile=FILE write verbose logging to FILE
-o backend-version=N force a specific backend version
-o program-width=N force a specific backend program width
-o invalid-chars=STR list of characters not allowed in filenames
-o replacement-char=C character to replace invalid characters with
-o <option[=value]> passes FUSE-specific options to the FUSE system

DESCRIPTION

mythtvfs is a "filesystem in userspace" (FUSE) interface to the MythTV Personal Video
Recorder (PVR) software, that allows you to interact with mythtv as if it were a file
system. It creates an overlay filesystem that encodes recording metadata (title, episode,
description, etc.) into a filename so that systems that do not natively talk to MythTV can
still get information about a given show. This allows use of standard UNIX programs (ls,
grep, cut, sort) to search and select programs, and permits running video software like
mplayer directly from the command line rather than via the normal MythTV GUI frontend.

The value of this is that it enables scripting of MythTV interactions using any scripting
language, through standard file system type operations. Examples could include: a bash
script for grepping through the listings to find a show and play it with mplayer; a Perl
script to encode and copy episodes of your favorite television shows onto a video iPod; a
Python script that downsamples/compresses recordings of a given tv series more than a
month old to save disk space; a Ruby program to generate an alternate GUI interface to
list available recordings and allow playing them via mplayer.

This may also be useful for users wishing to access mythtv and play recordings from
systems that cannot run mythtv (such as if they're running different Linux distros).

A design goal is to provide compatibility with the in-filename metadata extraction
capabilities in Galleon. See Filename Structure below.

Usage
After installing the FUSE libraries and kernel modules, mythtvfs can be built using the
standard `./configure && make`.

Unless your MythTV backend is running locally, you will also need to enable NFS on the
backend, export the MythTV video repository (typically /var/lib/mythtv) and establish an
NFS mount locally (at, say, /srv/myth).

MythTVfs can then be started from the command line as root:

mythtvfs -o host=mythtv.my.network /srv/myth/recordings /media/mythtvfs

or you can mount mythtvfs via fstab, for example:

mythtvfs#/media/mythtvfs /srv/myth/recordings fuse noauto,host=mythtv.my.network 0 0

See EXAMPLES below for more alternatives.

Filename Structure
Filenames in the MythTVfs filesystem default to being named based on their TV Program's
metadata. The elements are contained by the brace symbols ("{}") and have the original
filename embedded, and then end with ".mpg".

{SERIES_TITLE}{AIRED}{EP_TITLE}{REC_DATE}{CHAN}{DURATION}{DESC}FILE.mpg

Where "REC_DATE" has the format "Sat Jan 24 22:58:00 2009", and "AIRED" has the format
"2005-03-31". "DURATION" is measured in seconds, and "CHAN" is the shortened channel
"callsign". "FILE" is the original MythTV filename for storage (e.g.
"1013_20051207210000_20051207220000.nuv"). The file ends with ".mpg" because Galleon will
only recognize file extensions that it expects the TiVo to be able to play.

If you dislike the default filename format, you can change it using the "format" option.

Hooking to Galleon
You'll need a version of Galleon that understands this file format layout. A patch
against 2.1.0 is available on the MythTVfs homepage. Just add a "GoBack" path that
matches your MythTVfs mount point, and it will automatically extract all the metadata from
the filename.

OPTIONS

-h, --help
Prints a synopsis of program usage and exits.

-V, --version
Prints the program version and exits.

-d, -o debug
Enable debug output (implies -f)

-f Foreground operation

-s disable multi-threaded operation

-o option[=value]
-o host=HOST MythTV backend hostname

-o port=PORT MythTV backend port number

-o format=FORMAT Format to use for filenames. Defaults to
"{%T}{%a}{%S}{%s}{%c}{%d}{%D}%f.mpg". See below for what the various tags mean.

-o date_format=S Format to use within date fields, i.e. airdate. These tags
follow strftime(1) rules.

-o datetime_format=S Format to use within date+time fields, i.e. start. These
tags follow strftime(1) rules.

-o short-display shorter filename display format. Equivalent to setting
format="{%T}{%a}{%S}{%s}{%c}{%d}%f.mpg", except for a slight change in the
internal format of %s.

-o logfile=FILE write verbose logging to FILE

-o backend-version=N force a specific backend version

-o program-width=N force a specific backend program width

-o invalid-chars=STR list of characters not allowed in filenames

-o replacement-char=C character to replace invalid characters with

Other options passed directly to the FUSE system:

-o allow_other allow access to other users

-o allow_root allow access to root

-o nonempty allow mounts over non-empty file/dir

-o default_permissions enable permission checking by kernel

-o fsname=NAME set filesystem name

-o subtype=NAME set filesystem type

-o large_read issue large read requests (2.4 only)

-o max_read=N set maximum size of read requests

-o hard_remove immediate removal (don't hide files)

-o use_ino let filesystem set inode numbers

-o readdir_ino try to fill in d_ino in readdir

-o direct_io use direct I/O

-o kernel_cache cache files in kernel

-o [no]auto_cache enable caching based on modification times

-o umask=M set file permissions (octal)

-o uid=N set file owner

-o gid=N set file group

-o entry_timeout=T cache timeout for names (1.0s)

-o negative_timeout=T cache timeout for deleted names (0.0s)

-o attr_timeout=T cache timeout for attributes (1.0s)

-o ac_attr_timeout=T auto cache timeout for attributes (attr_timeout)

-o intr allow requests to be interrupted

-o intr_signal=NUM signal to send on interrupt (10)

-o modules=M1[:M2...] names of modules to push onto filesystem stack

-o max_write=N set maximum size of write requests

-o max_readahead=N set maximum readahead

-o async_read perform reads asynchronously (default)

-o sync_read perform reads synchronously

-o subdir=DIR prepend this directory to all paths

-o [no]rellinks transform absolute symlinks to relative

-o from_code=CHARSET original encoding of file names (default: UTF-8)

-o to_code=CHARSET new encoding of the file names (default: ANSI_X3.4-1968)

Format tags
The following format tags are undersood:

%a Airdate, e.g. "1961-11-17", defined by -o date_format

%c Station callsign, e.g. "SCIFI"

%D Show description, e.g. "The Earth begins moving closer to the sun."

%d Show duration in seconds, e.g. "1800"

%f mythtv file basename, e.g. "1029_20090201053000.mpg".

%S Show subtitle, e.g. "The Midnight Sun"

%s Start time, e.g. "05.30 AM Sun Feb 01, 2009", defined by -o
datetime_format

%T Show title, e.g. "The Twilight Zone"

EXAMPLES

Filesystem Mount Examples
To create a /media/mythtvfs on a local MythTV system (both backend and frontend are on the
same system)

mythtvfs -o host=localhost /var/lib/mythtv/recordings /media/mythtvfs

For mounting against a remote host named 'sparky', with its mythtv dir NFS mounted locally
at /myth, you might do:

mythtvfs -o allow_other,host=sparky /myth/recordings /media/mythtvfs

If you prefer a different file name format:

mythtvfs -o host=localhost,format="%T - %S - %s.mpg" /myth /mythtvfs

Command Line Use
Show a listing of all recorded titles and number of episodes for each:

# ls | cut -d} -f 1 | sed -e "s/{//" | uniq -c

23 Dark Angel
7 Nature
4 Survivorman
26 The Colbert Report
42 The Daily Show With Jon Stewart

Listing Nature programs sorted by original air date with newest first:

# ls {Nature}* | cut -d} -f 2,3 | sed -e "s/{//g" | sed -e "s/}/ /g" | sort -r

2007-11-11 The Cheetah Orphans
2007-11-04 In the Valley of the Wolves
2007-10-28 Silence of the Bees
2007-02-11 Supersize Crocs
2005-02-13 From Orphan to King
2005-01-09 Violent Hawaii
2004-02-08 Diamonds

Play the oldest episode of Dark Angel by original air date:

# ls {Dark\ Angel}* | cut -d} -f 2,8 | sort -r | \
sed -e "s/.*\}\(.*\)\.mpg$/\1/" | head -1 | xargs mplayer

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