Opened 3 years ago
Last modified 8 weeks ago
#10230 reopened enhancement
[Feature request] Dolby Surround/Pro Logic/II decoder
| Reported by: | audiopreservationist | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | unspecified | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description (last modified by )
There are a lot of old matrix'd movie soundtracks that have never been released in proper multichannel format, and modern AVRs don't support this technology. It would therefore be highly beneficial if ffmpeg could decode them, to ensure they remain playable forever.
I believe ffmpeg can encode DPLII, but not decode it. I don't know much about coding, but I found this thread on DPLII, which may be helpful for implementing the decoder: https://stackoverflow.com/questions/23713626/correctly-implementing-dolby-pro-logic-ii/23713627
Change History (7)
comment:1 by , 3 years ago
| Keywords: | surround added |
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comment:2 by , 3 years ago
| Description: | modified (diff) |
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follow-up: 4 comment:3 by , 3 years ago
| Keywords: | dolby request dolby surround dolby pro logic dolby pro logic ii decoder removed |
|---|---|
| Resolution: | → duplicate |
| Status: | new → closed |
comment:4 by , 3 years ago
comment:5 by , 3 years ago
| Resolution: | duplicate |
|---|---|
| Status: | closed → reopened |
comment:6 by , 3 years ago
I would be very interested in seeing this feature too, perhaps with options to decode to 4, 5, or 5.1 channels.
comment:7 by , 8 weeks ago
There is now downmix metadata for EAC3...
[SIDE_DATA] side_data_type=Metadata relevant to a downmix procedure preferred_downmix_type=unknown center_mix_level_db=-4.5 center_mix_level_ltrt_db=3.0 surround_mix_level_db=-6.0 surround_mix_level_ltrt_db=3.0 lfe_mix_level_db=-inf [/SIDE_DATA]
preferred_downmix_type can be Pro Logic II
Duplicate of #4175.