diff --git a/metadata/md5-cache/net-im/mautrix-signal-bin-0.5.1-r1 b/metadata/md5-cache/net-im/mautrix-signal-bin-0.5.1-r1
new file mode 100644
index 0000000..225ff22
--- /dev/null
+++ b/metadata/md5-cache/net-im/mautrix-signal-bin-0.5.1-r1
@@ -0,0 +1,15 @@
+BDEPEND=virtual/pkgconfig
+DEFINED_PHASES=compile install unpack
+DEPEND=acct-user/mautrix-signal-bin
+DESCRIPTION=A Matrix-Signal puppeting bridge.
+EAPI=8
+HOMEPAGE=https://docs.mau.fi/bridges/go/signal/index.html
+INHERIT=systemd
+IUSE=+ffmpeg
+KEYWORDS=~amd64
+LICENSE=AGPL-3
+RDEPEND=acct-user/mautrix-signal-bin ffmpeg? ( media-video/ffmpeg[opus] )
+SLOT=0
+SRC_URI=https://github.com/mautrix/signal/releases/download/v0.5.1/mautrix-signal-amd64 -> mautrix-signal-bin-0.5.1
+_eclasses_=toolchain-funcs	e56c7649b804f051623c8bc1a1c44084	multilib	c19072c3cd7ac5cb21de013f7e9832e0	systemd	c8b03e8df84486aa991d4396686e8942
+_md5_=ad83bd630a58ada81dffce873be81d38
diff --git a/net-im/mautrix-signal-bin/Manifest b/net-im/mautrix-signal-bin/Manifest
index 6fdc10d..dd7977c 100644
--- a/net-im/mautrix-signal-bin/Manifest
+++ b/net-im/mautrix-signal-bin/Manifest
@@ -1,5 +1,5 @@
 AUX example-config.yaml 16358 BLAKE2B 8398daaa7ba496f52e1cab6c39ca3db278640cca207c24d13aab7106fc2b8c1e78b2bbc2689faf2daa13e7e5094f30006dc4d1340117d8fa1963a37ace079279 SHA512 882168dc62d8e45310c31b60424e2401b4f777e90012cbafda68af0d86c09e51ea864ad6dc28a400d18d83e33d8ca97841c4f75ec17192c705662830b6751427
 AUX mautrix-signal.service 752 BLAKE2B a6ede48e7e59ce5d845b14346a417673833e8dec6a764f5ada951d10e39a7412beed5663746bc47dcaefcab9a9521fb02e516f828cad252b508e56ae992e13e3 SHA512 2d9fa8ad00cc5b607668789e5493475ad012bc62b9928ecbdbd19738dee6ccc7d98b8558f1e624764cd76b134cea126430cf3f682efa019a0a4cce7007276db2
 DIST mautrix-signal-bin-0.5.1 33327672 BLAKE2B ac4bea98b1a20b1b22429c4452356623576c11779ce6d1ad3d5977c7e0314efee4cdc4d74611e8b0113d23545007686bbf4d1e305e5af130f14383fb638cfe7b SHA512 4a7cc89eff8181acb009f2afa205035894662b963672199e5a4d8f1ef780417082ca6bdb00a589307af9cce6013add8afce3892e8db1249cf0576a1e9322a5c7
-EBUILD mautrix-signal-bin-0.5.1.ebuild 957 BLAKE2B aa244a4cf5b2a7d9c2257e65062ba2f216c2e4835e0c4ae1aa59d9ccd5eb6d3154a4387a1a09fc17c67014139cdae142dbdb4820f57960cef30f741090d03e06 SHA512 44da268748299688e8a3ebfc5255c1d1ea0b39a4a85e0583f0492367794e2268d810c77529cdc072cbea82f54a55a61e119d8b3313453b6aaa58810b532a533f
-MISC metadata.xml 327 BLAKE2B b43501e0f83e76c07376c8ecbbeef40b1edb5541df3863b1d707378b357781e37d73a11bb47ba3e5f4a44ded424900342bc9a9ad5b1e2636a554bcdbbd96c755 SHA512 9974cd49059b27751c44655b90c20b0197e91f2aa42af2a45c4f40023cf23163c2aa8df6fe98e8090f4f92576383da50d7fb2035ea33b8b61cecf671d96af3f1
+EBUILD mautrix-signal-bin-0.5.1-r1.ebuild 1011 BLAKE2B 090cb9325945d39a9bb1aa6ae0a71ab36ae3aecdfb7836b0cff6c34e7a3ca25f2e9c4bcdf9bd23ed2382256342fa9e934294aa71476b8eeea15b2797688cb312 SHA512 dca89fc2b4c1b3377333c01fd9e5222371d77d2299ccaa00e916acc086463a7453d12d8ded846a1e2d9c25f5014a7b9807b5947b8fe58e32a7e2114f80912633
+MISC metadata.xml 419 BLAKE2B 2266b6db5dd7f21725112ada4aec9658c95fbf00cc1673497a12478bf8ad975de5cb4716097a84c6db3847a9239160b5f29f607384efc8be2fc6a2e8646e1ad9 SHA512 038ea7d0764eabd581dd9259b237aa05073405b0fccccc1113ab4b54ae14876050013baf62ab5664039af86c4651016d58f538f1eb789c58b1326118a7511135
diff --git a/net-im/mautrix-signal-bin/mautrix-signal-bin-0.5.1.ebuild b/net-im/mautrix-signal-bin/mautrix-signal-bin-0.5.1-r1.ebuild
similarity index 92%
rename from net-im/mautrix-signal-bin/mautrix-signal-bin-0.5.1.ebuild
rename to net-im/mautrix-signal-bin/mautrix-signal-bin-0.5.1-r1.ebuild
index 448ae69..e55e8a1 100644
--- a/net-im/mautrix-signal-bin/mautrix-signal-bin-0.5.1.ebuild
+++ b/net-im/mautrix-signal-bin/mautrix-signal-bin-0.5.1-r1.ebuild
@@ -8,12 +8,15 @@ DESCRIPTION="A Matrix-Signal puppeting bridge."
 HOMEPAGE="https://docs.mau.fi/bridges/go/signal/index.html"
 SRC_URI="https://github.com/mautrix/signal/releases/download/v${PV}/mautrix-signal-amd64 -> ${P}"
 
+IUSE="+ffmpeg"
+
 LICENSE="AGPL-3"
 SLOT="0"
 KEYWORDS="~amd64"
 
 DEPEND="acct-user/mautrix-signal-bin"
-RDEPEND="${DEPEND}"
+RDEPEND="${DEPEND}
+	ffmpeg? ( media-video/ffmpeg[opus] )"
 
 S="${WORKDIR}"
 
diff --git a/net-im/mautrix-signal-bin/metadata.xml b/net-im/mautrix-signal-bin/metadata.xml
index 5de5af8..02c86d1 100644
--- a/net-im/mautrix-signal-bin/metadata.xml
+++ b/net-im/mautrix-signal-bin/metadata.xml
@@ -5,6 +5,9 @@
 		<email>manuel@fritteli.ch</email>
 		<name>Manuel Friedli</name>
 	</maintainer>
+	<use>
+		<flag name="ffmpeg">Enable brigding voice messages by using ffmpeg.</flag>
+	</use>
 	<upstream>
 		<remote-id type="github">mautrix/signal</remote-id>
 	</upstream>