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feat(transcode): add opus 192 profile

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This diff adds the 192kbps OPUS transcoding profile named
opus_audiophile. While 128kbps is already near transparent and good
for most use cases, sometimes (or by some people) a bit more is preferred.
These are typically for dedicated high quality wireless audio link
(A2DP-bluetooth) enabled headphones and Hi-Fi adapters.

The 160-192kbps range is considered to be transparent with very low
chance of artifacts (only with very few and specific samples)[1][2].

[1] https://wiki.hydrogenaud.io/index.php?title=Opus
[2] https://ceur-ws.org/Vol-2654/paper25.pdf
This commit is contained in:
Zoltan Puskas
2023-02-11 23:25:41 -08:00
committed by sentriz
parent 475749534f
commit 5dcc8c18a1
1 changed files with 3 additions and 0 deletions
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3
transcode/transcode.go
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@@ -27,6 +27,7 @@ var UserProfiles = map[string]Profile{
"opus_128_car": Opus128RGLoud,
"opus_128": Opus128,
"opus_128_rg": Opus128RG,
"opus_192": Opus192,
}
// Store as simple strings, since we may let the user provide their own profiles soon
@@ -41,6 +42,8 @@ var (
Opus128 = NewProfile("audio/ogg", "opus", 128, `ffmpeg -v 0 -i <file> -ss <seek> -map 0:a:0 -vn -b:a <bitrate> -c:a libopus -vbr on -f opus -`)
Opus128RG = NewProfile("audio/ogg", "opus", 128, `ffmpeg -v 0 -i <file> -ss <seek> -map 0:a:0 -vn -b:a <bitrate> -c:a libopus -vbr on -af "volume=replaygain=track:replaygain_preamp=6dB:replaygain_noclip=0, alimiter=level=disabled, asidedata=mode=delete:type=REPLAYGAIN" -metadata replaygain_album_gain= -metadata replaygain_album_peak= -metadata replaygain_track_gain= -metadata replaygain_track_peak= -metadata r128_album_gain= -metadata r128_track_gain= -f opus -`)
Opus128RGLoud = NewProfile("audio/ogg", "opus", 128, `ffmpeg -v 0 -i <file> -ss <seek> -map 0:a:0 -vn -b:a <bitrate> -c:a libopus -vbr on -af "aresample=96000:resampler=soxr, volume=replaygain=track:replaygain_preamp=15dB:replaygain_noclip=0, alimiter=level=disabled, asidedata=mode=delete:type=REPLAYGAIN" -metadata replaygain_album_gain= -metadata replaygain_album_peak= -metadata replaygain_track_gain= -metadata replaygain_track_peak= -metadata r128_album_gain= -metadata r128_track_gain= -f opus -`)
Opus192 = NewProfile("audio/ogg", "opus", 192, `ffmpeg -v 0 -i <file> -ss <seek> -map 0:a:0 -vn -b:a <bitrate> -c:a libopus -vbr on -f opus -`)
)
type BitRate uint // kilobits/s