Opened 18 years ago
Closed 14 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 |
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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 18 years ago by
comment:2 Changed 17 years ago by
Status: | new → assigned |
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comment:3 Changed 16 years ago by
Component: | mythtv → MythTV - Video Playback |
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comment:4 Changed 15 years ago by
Component: | MythTV - Video Playback → MythTV - Audio Output |
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Is this even valid anymore?
comment:5 Changed 14 years ago by
Owner: | changed from Janne Grunau to JYA |
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This capability has been replaced by an alternate library, and we only fall through to the ffmpeg mixer if SSE is not supported by the hardware (which leaves only ARM?).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 14 years ago by
Resolution: | → Won't Fix |
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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