Difference between revisions of "Using MythTV"
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Detailed information on
Detailed information on recordings can be found in the [[User Manual:Manage Recordings|Manage Recordings]] sub chapter of this manual.
===Common recording scenarios===
===Common recording scenarios===
Revision as of 07:31, 17 March 2007
|User Manual:Detailed configuration Frontend||User Manual:Index||User Manual:Accessory Modules|
Using A Myth Box From Day To Day
Ah, yes; the part you've all been waiting for. :-)
This section identifies all the things you can do with a MythTV unit, and explains how they work and how to control them. Hopefully, it will also identify things which can be done more than one way, and point out the most effective choice (and why you might want to do it another way anyway).
MythTV is, as we've said, a very capable, powerful, and most of all expandable system. The practical effect of this is that as we go along, we will describe things which can only be done with more than the basic configuration, or which work differently if you have more than the basic configuration.
- 1 Conventions and notes
- 2 Introduction
- 3 Starting MythTV
- 4 Watching and Recording Live TV
- 5 Watching Recordings
- 6 Managing Recordings
- 7 Archiving Recordings
- 8 Exporting Recordings
- 9 Playing DVDs
- 10 Importing DVDs
- 11 Managing Media
- 12 Information Center
- 13 Advanced Features
Conventions and notes
Whether your screen will look exactly like the screenshots in this manual will vary depending on the theme you have chosen.
- Editor's note: The images below are using only one of the several available OSDs. Personally, I prefer some of the other, "prettier", OSDs (no offense to the author of that OSD). Also note that some of the behaviors noted in this document will change with the release of 0.19 (mainly the LiveTV section). --TylerDrake
- Editor's note: Please keep configuration related items as well as deep technical explanations to a minimum in editing this section. This section of the manual is for end-users; technical topics should be covered in the setup and config sections --Mikec 06:06, 28 January 2006 (UTC)
Remote Control Buttons
The remote button icons represent common names for remote control keys. In reality, how these map to physical keyboard keys will depend on how your particular machine was configured. You will need to setup your Remote Control to suit.
You can find a full list of keyboard keys and functions on the keybindings page.
MythTV has been designed to be used via the "ten foot Interface": you should be able to drive its day to day functions from ten feet (3 metres) away sitting comfortably on your sofa.
In many respects, this is a compromise between functionality and simplicity. This is especially the case given that the average Remote Control only has about 40 to 50 keys (10 of which are numbers). Compare this with MythTV's over 100 keyboard functions.
MythTV users will also cite the much needed WAF or GAF; that is, Wife/Girlfriend Acceptance Factor. The good news is the 80/20 rule applies - you can do 80% of your day to day things with MythTV on about 20 keys on your remote.
Live TV vs MythTV
MythTV introduces a whole new paradigm shift in the way you watch TV. Traditional TV forced you to watch against the broadcaster's schedule. This meant that you scheduled your time around your favorite programs. This also created the channel-surfing culture, cycling through channels just to see what was on, more often than not there was never anything you liked.
MythTV introduces the Electronic Program Guide, or EPG, with its full description of what is currently being broadcast and what will be broadcast in the coming weeks. The guide is stored in a relational database so that you can make queries such as find episodes of "Desperate Housewives".
MythTV watching is more like the way you would watch your DVD collection. You browse what is in your collection and watch what you want, when you want. However instead of going out and buying DVD's, you harvest your favourite programs as they are broadcast, record them to your hard drive and watch them as you want.
MythTV has plugins that actually allow you to just look for broadcasts of your favourite films and, as soon as they are broadcast, record them to your hard drive to add to your collection! You can even have the system make recommendations and record them against the kind of shows that you like.
Many long-term MythTV users will say that they have stopped watching live TV and are instead spending time each week scheduling the system to record the kind of shows they like and just browsing through their collection of shows and movies and watching what they like at their leisure.
Dealing with Commercials
Whether you like to watch adverts/commercials is a matter of taste. MythTV on the otherhand gives you a choice of skipping over these in your recordings. As such MythTV is often compared to a TiVO. There is much activity in the industry with respect to commercial handling, and forcing users to watch these ie. you cant fastforward or skip these with Personal Video recorder devices or applications, indeed it may even become illegal to do so.
Over the years MythTV has transformed itself into a full blown media hub, able to handle all digital media including photos, music, videos, DVD and CD plus much more. More importanly since the 0.20 release, MythTV is now able to support the new Universal Plug and Play (UPnP) media server/client and control point standard, so that it can interact with all manner of other media applications and devices.
MythTV consists of two main applications: MythBackend and Mythfrontend. Mythbackend handles all aspects of your TV cards and capturing live TV shows into recordings, and most importantly all the information about these recordings and any media you have such as music and photos. You will always need to start the Mythbackend first. Mythfrontend handles the user interface and the interaction between you, your remote control and the mythbackend server.
Ideally mythbackend/mythfrontend should be autostarted when you power on your machine, see the user Manual:Detailed configuration Backend and user Manual:Detailed configuration Frontend on how to do this. Many users just leave their machines running all the time so that they can be sure to capture scheduled TV shows to recordings. For those of you that are concerned about electricity usage, then you can have your MythTV machine automatically wakeup just before a show starts, and then shutdown after the show has been recorded. The mythbackend server will automatically shut down when it is idle, ie is not connected to a front end, or is not recording.
You can also start Mythbackend from a terminal session with the following command:
And the MythTV Frontend with the following command:
mythfrontend can be run either in full screen mode or inside a window.
Once MythTV has started you will be presented with the MythTV Front page. Here is one using the Retro Theme.
You can see a collection of Themes available here MythTv Themes.
MythTV Welcome Screen
0.19 introduced the concept of a "welcome screen" so that the frontend could be started with a press of the remote control. This has been introduced for those people that want to use scheduled wakeup and shutdown to record scheduled shows to save on power consumption. Prior to this the Frontend would always start up which in turn meant that the backend would never shutdown when the recording had finished, thus defeating the whole purpose.
The welcome screen will show the status of the backend and wait for you to manually start the frontend with your remote
You should set your system to autostart with mythwelcome rather than mythfrontend. Mythwelcome will automatically start mythfrontend in the event that the system is normally powered on. You can change this behaviour by accessing the configuration page. Press
You may find it helpful to read the Mythwelcome configuration page
Watching and Recording Live TV
Detailed information on watching live TV can be found in the Watch TV sub chapter of this manual.
Detailed information about watching recordings can be found in the Watch Recordings sub chapter of this manual.
Detailed information on scheduling recordings can be found in the Manage Recordings sub chapter of this manual.
Detailed information on editing and transcoding can be found in the Removing Commercials page.
Common recording scenarios
- Note: This is intended to be a use-case or best practices section for setting up different types of recordings.
New episode each week. Single showing per week.
- This will be the most common recording type. Channel record.
New episode each week. Multiple showings per week.
- Locate the timeslot that is the first airing of the new episode for the week. Setup as a find weekly.
New episode each (week?) day. Single showing per day.
- Channel record.
New episode each (week?) day. Multiple showings per day.
- Locate the timeslot that is the first airing of the new episode for the day. Setup as a find daily.
Any showing of a single episode.
How MythTV Records
Ringbuffer and Recordings
Prior to the 0.19 release MythTV treated timeshifting ie chase play and recording a programme differently. There was a Ringbuffer that handled the timeshifting element, whereas Recordings were saved into their own file. This had some negative side effects.
1. If you were watching a live show and 15 minutes into it you decided that you wanted to record it, pressing the record key only recorded the show at that point. You lost 15 mins worth even though those 15mins were in the ringbuffer.
2. Changing channels was unnecessarily slow because the system had to mess around with the ringbuffer each time.
With 0.19 Timeshifting and recording are one and the same. Now if you press the record button 10 mins into the show, all MythTV does is make a change in the database to indicate that this is a Recording and by magic it appears in your recordings collection.
Live TV recordings that have not been transitioned appear in the Default Recordings group.
Expirations of Recordings
If your machines starts to run low in disc space it will start to expire (delete) recordings to make room. The default behaviour is to delete oldest shows first, and is checked every 10 mins. You can mark Recordings as permanent in the Recording Browser. Select the recording you want and press and select "Don't Auto Expire".
You can change the default beviour in TV settings->General settings-> Global Auto Expire Settings
MythTV recordings are automatically flagged for commercials, ie there are markers put in the database that tell the system where it believes commercials start and end. This allows you to jump over commercials when playing back recordings. You can also use this information to delete the commercials when you export the recordings.
You can change the default behaviour in TV settings->General settings->Job Queue
You might find it useful to have a look at Commercial Flagging which explains how it works.
Normally, commercials are just flagged so you can skip them, but not actually removed from a recording. If you're interested in permanently removing them, please refer to Removing Commercials.
At some point you will want to archive your TV recordings for safe keeping. There are however some complications with this, due to the way Digital TV content is held on your hard drive. MythTV stores its recordings in the "/mnt/video" directory by default. You will find files in here with a .nuv file extension and a long complicated name based on the recording schedule. These files are in NuppelVideo format.They are effectively MPEG-2 files with special markings to help digital TV cope with any dropped information during broadcast. To archive these files to DVD they will need to be converted into normal MPEG-2 files that are compliant with the DVD standard.
MythTV 0.20 plug-ins now includes MythArchive for archiving your recordings. What follows is for users of MythTV 0.19 or earlier. A separate detailed guide exists for SUSE users at http://acaciaclose.co.uk/28654/124502.html. There are also prebuilt scripts to do all of the steps below automagically called MythBurn.
The process to archive recordings to DVD before version 0.20 involves the use of several external tools in the following steps:
Split DVB File with ProjectX
Project X takes a collection of DVB stream files and concatenates them into one big project. You can trim the files here also. It will then create synchronization marks between the audio and video. You can use the default settings.
Create DVD MPEG-2 stream
We now can convert the above output video (m2v) and audio stream (mp2) generated by projectX to a DVD compatible stream. We use the mplex command, which is part of mjpegtools. You will then have a .mpg file with combined audio and video all nicely synchronized.
> mplex -f 8 -o 1.mpg 1.m2v 1.mp2
Create a DVD Image with KDE_DVDAuthor
KDE DVD Author will allow you to create very nice DVD's complete with animated menus. You do not need to compile it. Just download and click on the installer.kmdr icon and KDE will install it. KDE DVDAuthor is a KDE Kommander application.
- DVD Author
Just follow the steps in the wizard, adding in the video , audio and images files that it asks for. It wil then generate a DVD ISO image once it completes.
Burn DVD image using K3b
K3b includes a wizard to burn DVD ISO images. You will find it under the Tools pull down. Tools -> Burn DVD ISO image. Just load up the ISO image from step 3, and you are done.
MythTV recordings can be exported into multiple different formats such as iPod or PSP compatible MPEG-4 files, DivX and Xvid files, or files to burn to VCD, SVCD or DVD with the use of an external program such as nuvexport, which can be downloaded from https://svn.forevermore.net/nuvexport/.
Nuvexport is a command line program that can be used to create a copy of your recording in the following formats: Xvid, SVCD, VCD, DVCD, DVD, DivX, ASF, MP3, PSP, iPod, and MPEG-2 (though the iPod and PSP export options are currently unavailable). It does not alter the original file in any way, just gives you a new one in a folder of your choosing.
When run, it will use information from the MythTV database to give you a list of all your recordings to choose from, and allow various options such as resizing the video, cutting out sections marked with MythTV's edit cut list, altering the bitrate, and various other things. A work in progress manual for nuvexport can be found at http://www.inaudible.co.uk/nuvexport.
There is also a specialized script that allows you to transcode your files and subscribe to them on your iPod available at http://myth2ipod.com/. This utility uses nuvexport, and then does special post-processing with MP4Box to create an iPod-ready video. It will even generate an RSS feed for your shows, which you can subscribe to in iTunes. Currently (6/22/06) transcoding HD shows doesn't appear to work - you get rolling colors and disjointed sound. This is apparently a bug in nuvexport. SD shows work fine though.
Exporting to Flash
You may find it useful to read the section on exporting to your recordings to flash file format. This will allow you to easily watch recordings using a web browser.
As of 0.20 there are two ways to play DVD Discs on your Myth Box
- Use the internal DVD player, MythDVD. It has complete menu and subtitle support, as well as consistent remote control and menu settings. It will also bypass all of the clag such as anti-pirate and FBI warnings and go straight to the main movie.
- Use an external player such as Xine or Mplayer. Xine offers DVD Menu support, but you will need to do some work to map your keys on your remote control so that they match those for MythTV to make sure that there is no confusion what keys do what. As this is an external player you also need to make sure that the audio options are set up within xine and MPlayer as needed. You may find it useful to read the Configuring Xine page.
The MythDVD plugin offers the capability to Rip your DVD's to the hard drive and then optionally compress the movie from its normal 5-9GB file size to 700MB-2GB depending on the final quality that you want. When transcoding the system will use the settings defined in the frontend configuration. The default is to use the Xvid codec.
Select the Import option on the Myth Frontpage -> Optical Disks -> Import DVD and follow the Ripping Guide.
Once you have either ripped DVDs or copied video files to the Video directory you will want to add both movie information as well as DVD cover art. You can do this via the Video Manager of MythVideo.
The MythVideo plugin provides the ability to manage and play videos of various formats with the help of external players.
The MythGallery plugin allows you to view all your photos as well as short movies from your digital camera. It will show your photos as they are organised in your file system and generate thumbnails of both folders as well as individual photos.
The MythMusic plugin adds the ability to manage and play music files on the frontend.
The information center contains system status information and access to plugins like MythBrowser.
A detailed description about the information center can be found in the Information Center sub chapter of this manual.
Controlling the mythfrontend via telnet (0.19)
For detailed information see the Telnet socket article.
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