Difference between revisions of "User talk:Sususu"

Revision as of 10:40, 18 June 2011

Discussion from Frontend Feature Wishlist

Rather than continue dirtying up the wishlist, I'm continuing this here instead.

Audio Level During Commercials

You are using MythTV, which does have the ability to skip at will. Telling someone to simply skip commercials when they complain about them is most certainly not trolling, but rather simply stating the design intent of the application. If the commercial detection does not function properly, fast forward. If you do not like the fast forward behavior, use the time skip instead. Default skip length is 30 seconds, set for the default commercial length in North America. You can change this if Germany is different. Alternatively, hit one or more numbers, followed by an arrow key, to jump that many minutes in the video.

uh and what if i want to watch commercials .. ?

what if i'm watching live tv?

what if i dont want to wait until the commercials are marked?

in fact its FASCIST to tell someone to skip it ... and it doesnt help in the matter. because the subject is not about commercial detection and jumping but about volume errors ... therefore its trolling (trolling: a useless argumentation not adding any value to the main topic )

commercial detection is dead already .. its something none needs when it doesn't work fast and precisely and it can never work precise with reasonable effort ...

its final: skipping commercials is no default option for all and must not be enforced (not even by US-Americans)

Variable volume in a recording is a problem, but the solution is not to choose MP2 over AC3 tracks. The problem you are experiencing is because AC3 has a parameter called dialnorm, which seeks to allow full use of dynamic range, while ensuring the audio is properly loud for playback. MythTV blindly ignores this parameter. Television shows broadcast using this parameter may be significantly quieter than commercials, because MythTV is not applying the proper gain during playback.

question is, are there plans to include this ? ... would be great if it was ...

however still my points stay valid

1. people want to configure their system freely

2. for several choosing an audiotrack by themself is practiced and it would ease the lives of many of them if they could select one by default

3. its easy as disabling the automatic audiotrack-selection so its of no use to resist it ... as i said i will implement it eventually

Stereo Downmixing

MythTV applies a matrix downmix when playing 5.1 audio over a 2.0 output. The front and rear channels are each reduced in level, and then mixed together to retain the same sound intensity as in the original. This is the same behavior as nearly any other video player. If the mixer is not outputting the same overall sound intensity as the input, then that is a bug, not a feature wish. The only known problem is that in systems without SSE support (PPC/ARM), MythTV falls back to using ffmpeg mixing, which results in low volume levels.

Commercial Detection

The bulk of MythTV developers, and all of those who have tinkered significantly in the commercial detection algorithms, are located in the US. While that means the algorithms are tuned for, and work reasonably well with, North American television content, it unfortunately means performance in other markets may be poor. This is something that really needs someone in the area with access to significant amounts of location specific recordings to fix. As cliche as this seems sometimes, patches welcome.

Some British users have had luck using silence detection to mark commercial points. There is a hackish script on the wiki that wraps a tool intended for use with single-file mp3 albums, and manually produces a commercial list. A proper audio analysis mechanism in mythcommflag would likely go a long way to improving accuracy for everyone.