Opened 14 years ago
Closed 14 years ago
#8627 closed defect (fixed)
Upmix not working - got weird sound on DVB channels that transmit only 2 channels (Stereo)
Reported by: | Owned by: | JYA | |
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Priority: | major | Milestone: | unknown |
Component: | MythTV - Audio Output | Version: | Unspecified |
Severity: | medium | Keywords: | |
Cc: | Ticket locked: | no |
Description
Testing trunk-25198 with MythBuntu? weekly builds (0.24.0~trunk25198-0ubuntu0~mythbuntu1)
- Using MSI Meda Live (http://www.mythtv.org/wiki/MSI_Media_Live) with MythBuntu? 10.04 - weekly builds of MythTV
- Pulse Audio is turned off
- Audio Configuration:
- Device set to: ALSA:iec958
- Speaker configuraation: 5.1
- DTS and Dolby Digital is checked
- The computer is connected directly to a Harmon Kardoon receiver via Digital Coaxial cable.
- Upmix is on - set to "Fastest"
When looking on DVB channels that transmits only 2 channels, the receiver detect Dolby Digital audio but, the upmix results in just hearing a lot of garbage.
DVB channels that transmits more then 2 channels, already 5.1 or something similar, then everything works OK.
Turning off upmix in configuration results that all DVB channels are transmited with 2 channel audio. Which make me think that the audio engine do some kind of downmix for channels with 5.1 audio in this case.
Attachments (1)
Change History (5)
comment:1 Changed 14 years ago by
comment:2 Changed 14 years ago by
Status: | new → infoneeded_new |
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Upmixer only works with stereo input.
A mono-playback will not be upmixed, you just can't. Upmixing to 5.1 use the weighted values between the left and right channel to identify which channel it should go to.
Depending on what your hardware support, mono input will be duplicated on left and right channels
If this is what you mean by "wierd" behaviour, this is what's intended
Changed 14 years ago by
Attachment: | sample.mpg added |
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A small sample from "Discovery Channel" where upmix fails
comment:3 Changed 14 years ago by
Status: | infoneeded_new → new |
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a 500ko sample is not going to help ... 30MB would be better.
Adding some further comments: