Difference between revisions of "Playback profiles"

Revision as of 00:45, 20 March 2008

Playback profiles are a way for MythTV to set individual settings for various types of media through the internal media player.

Three profiles come by default, CPU--, CPU+, CPU++. You may also create your own profile.

Each profile is multiple groups of display options that apply to different source resolutions in the recording. The profiles will be evaluated in order of priority, then by matching resolutions, if those resolutions can be handled by the decoder specified. In other words, if you have ivtv specified as the decoder, but don't have a PVR-350 configured, those settings will be skipped in favor of the next matching profile group. Likewise, XvMC only supports MPEG-2 streams, so if you wish to use XvMC groups, they should be higher priority than Xv groups, so MPEG-4 recordings will fail through the XvMC groups but MPEG-2 streams will be caught by the higher priority XvMC group.

Available Settings

What options you have for each setting is defined by your configuration options as well as which development packages you have installed on your computer. The available settings are briefly as follows:

Resolution comparison

This pair of settings define the resolutions that this group will apply to.

Decoder

This defines what library will assist MythTV in displaying the image, be it software (nuppeldecoder, ffmpeg, libmpeg2), or hardware assisted (ivtv/pvr350, xvmc, mac, via-xvmc)

Video Renderer

This controls how the video is actually displayed to the screen, and is defined by what's available to you

OSD Renderer

How the OSD is overlaid on the video

OSD Fade

Whether the OSD fades or vanishes when it times out

Deinterlacer

The method used to deinterlace the video for display

Secondary Deinterlacer

The method used if the first method fails. For example, if the framerate is too slow for the bob deinterlacing method

Filters ; The filters to apply

Default profiles

Note: If you manage to muck up your playback profile and want the defaults back: First, copy down information you want to "save" from your current Playback Profile Group configuration (unless you want to just start over). Then, start deleting all the Playback Profile Groups. Go to the "Delete" button next to "Current Video Playback Profile" and hit it until there's no name left in the drop-down box next to "Current Video Playback Profile" (it should be blank). At this point, the Playback Profile Entries may look messed up (there may be some seemingly random number of them that may or may not be filled out), but don't worry about that. Then, select the Next button to "save" your settings. Finally, go back through TV Setting->Playback until you get to the "Playback Profiles (3/9)" page, where you'll see all the defaults. Then, add a new playback profile group and edit to your content.

CPU++ default settings

CPU++ is designed for high powered machines. It relies entirely on software rendering to display the image.

CPU+ default settings

This is the default playback profile. It is designed to offload as much work as possible to the hardware.

CPU-- default settings

CPU-- a profile designed to offload as much of the work as possible into hardware.