Opened 14 years ago
Closed 14 years ago
#9989 closed Patch - Bug Fix (fixed)
no sound with 5ch AC3 audio with 6 CH audio out
| Reported by: | Mark Spieth | Owned by: | JYA |
|---|---|---|---|
| Priority: | minor | Milestone: | 0.25 |
| Component: | MythTV - Audio Output | Version: | Master Head |
| Severity: | medium | Keywords: | |
| Cc: | Ticket locked: | no |
Description
If a 5 channel AC3 audio program is played with a 5.1 alsa audio output, no sound is heard. This is because alsa does not support 5 ch output. The solution is to upmix 5ch audio to 6 ch if required.
channel affected is OneHD with some sports like Nascar having this format.
patch attached.
Attachments (1)
Change History (5)
Changed 14 years ago by
| Attachment: | 28-audio5chan added |
|---|
comment:1 Changed 14 years ago by
comment:2 Changed 14 years ago by
could you provide a sample?
I remember recording one of those, but I guess it will be faster with a provided sample.
I see issues with the existing patch, in particular it will break mono-audio playback...
I will redo it and hopefulyl will be done today
comment:3 Changed 14 years ago by
Ok, I've found one (the fear factor on One HD)
After a quick glance at your patch I can see the following problems:
- Mono will be upmixed through freesurround upmixer (and not the mono -> stereo one)
- If upmixing isn't enabled, then the 5.0 to 5.1 conversion will not occur. And you can't toggle the upmixer as it only works if source is stereo.
comment:4 Changed 14 years ago by
| Milestone: | unknown → 0.25 |
|---|---|
| Resolution: | → fixed |
| Status: | new → closed |
Allow 5.0 audio playback on hardware not supporting it.
ALSA doesn't support 5.0 audio and myth could only upmix mono and stereo. Extend upmixer to work with 5.0 audio. Based on a patch by Mark Spieth Fixes #9989
Branch: master Changeset: 909b444ede4dd08fe1e468b969aa9928bbc6a131
Is this with digital audio out (PCM) or analog out ?
On my hdmi output, where 5 channels isn't supported, then it gets converted to AC3 and play 5.0 just fine