Opened 12 years ago
Closed 8 years ago
#3911 closed defect (Won't Fix)
Downmixed multi channel AC3 audio is quieter after ffmpeg resync in [13655]
| Reported by: | Janne Grunau | Owned by: | JYA |
|---|---|---|---|
| Priority: | minor | Milestone: | unknown |
| Component: | MythTV - Audio Output | Version: | head |
| Severity: | medium | Keywords: | |
| Cc: | Ticket locked: | no |
Description
The new internal AC3 decoder is 9-10dB quieter than the liba52 based one for downmixing 5.1 audio to stereo. This seems to be a issue of the downmixing code as decoding stereo AC3 is working fine.
The difference is only 4dB with ffmpeg revision 10252 from svn trunk.
Change History (6)
comment:1 Changed 12 years ago by
comment:2 Changed 11 years ago by
| Status: | new → assigned |
|---|
comment:3 Changed 10 years ago by
| Component: | mythtv → MythTV - Video Playback |
|---|
comment:4 Changed 9 years ago by
| Component: | MythTV - Video Playback → MythTV - Audio Output |
|---|
Is this even valid anymore?
comment:5 Changed 8 years ago by
| Owner: | changed from Janne Grunau to JYA |
|---|
This capability has been replaced by an alternate library, and we only fall through to the ffmpeg mixer if SSE is not supported by the hardware (which leaves only ARM?). It's probably safe to close this one fixed.
comment:6 Changed 8 years ago by
| Resolution: | → Won't Fix |
|---|---|
| Status: | assigned → closed |
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(In [14365]) Refs #3911. Add 9dB amplification to libavcodec's ac3 downmix code.
Downmixed 5.1 is since [13655] 9-10dB quieter than the old lib52 based decoder Reprted and suggested fix by bjm