diff --git a/Config/Project.xcconfig b/Config/Project.xcconfig
index 5772467ee..c3c50db54 100644
--- a/Config/Project.xcconfig
+++ b/Config/Project.xcconfig
@@ -25,7 +25,7 @@
 KEYCHAIN_ACCESS_GROUP = $(AppIdentifierPrefix)$(BASE_BUNDLE_IDENTIFIER).keychain.shared
 
 // Build settings
-IPHONEOS_DEPLOYMENT_TARGET = 11.0
+IPHONEOS_DEPLOYMENT_TARGET = 12.1
 SDKROOT = iphoneos
 TARGETED_DEVICE_FAMILY = 1,2
 SWIFT_VERSION = 5.3.1
diff --git a/Podfile b/Podfile
index 0b963c87f..32d841a90 100644
--- a/Podfile
+++ b/Podfile
@@ -1,5 +1,5 @@
 # Uncomment this line to define a global platform for your project
-platform :ios, '11.0'
+platform :ios, '12.1'
 
 # Use frameforks to allow usage of pod written in Swift (like PiwikTracker)
 use_frameworks!
@@ -70,6 +70,7 @@ abstract_target 'RiotPods' do
     pod 'SwiftJWT', '~> 3.6.200'
     pod 'SideMenu', '~> 6.5'
     pod 'DSWaveformImage', '~> 6.1.1'
+    pod 'ffmpeg-kit-ios-audio', '~> 4.4'
 
     pod 'FLEX', '~> 4.4.1', :configurations => ['Debug']
 
diff --git a/Riot/Modules/Room/RoomViewController.m b/Riot/Modules/Room/RoomViewController.m
index 4d0786654..5d23e8fa6 100644
--- a/Riot/Modules/Room/RoomViewController.m
+++ b/Riot/Modules/Room/RoomViewController.m
@@ -6187,7 +6187,7 @@ const NSTimeInterval kResizeComposerAnimationDuration = .05;
 
 - (void)voiceMessageController:(VoiceMessageController *)voiceMessageController didRequestSendForFileAtURL:(NSURL *)url completion:(void (^)(BOOL))completion
 {
-    [self.roomDataSource sendVoiceMessage:url mimeType:@"audio/m4a" success:^(NSString *eventId) {
+    [self.roomDataSource sendVoiceMessage:url mimeType:nil success:^(NSString *eventId) {
         MXLogDebug(@"Success with event id %@", eventId);
         completion(YES);
     } failure:^(NSError *error) {
diff --git a/Riot/Modules/Room/VoiceMessages/VoiceMessageAudioConverter.swift b/Riot/Modules/Room/VoiceMessages/VoiceMessageAudioConverter.swift
new file mode 100644
index 000000000..2df5454cb
--- /dev/null
+++ b/Riot/Modules/Room/VoiceMessages/VoiceMessageAudioConverter.swift
@@ -0,0 +1,65 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+enum VoiceMessageAudioConverterError: Error {
+    case generic(String)
+    case cancelled
+}
+
+struct VoiceMessageAudioConverter {
+    static func convertToOpusOgg(sourceURL: URL, destinationURL: URL, completion: @escaping (Result<Void, VoiceMessageAudioConverterError>) -> Void) {
+        let command = "-hide_banner -y -i \"\(sourceURL.path)\" -c:a libopus \"\(destinationURL.path)\""
+        executeCommand(command, completion: completion)
+    }
+    
+    static func convertToMPEG4AAC(sourceURL: URL, destinationURL: URL, completion: @escaping (Result<Void, VoiceMessageAudioConverterError>) -> Void) {
+        let command = "-hide_banner -y -i \"\(sourceURL.path)\" -c:a aac_at \"\(destinationURL.path)\""
+        executeCommand(command, completion: completion)
+    }
+    
+    static private func executeCommand(_ command: String, completion: @escaping (Result<Void, VoiceMessageAudioConverterError>) -> Void) {
+        FFmpegKitConfig.setLogLevel(0)
+        
+        FFmpegKit.executeAsync(command) { session in
+            guard let session = session else {
+                completion(.failure(.generic("Invalid session")))
+                return
+            }
+            
+            guard let returnCode = session.getReturnCode() else {
+                completion(.failure(.generic("Invalid return code")))
+                return
+            }
+            
+            DispatchQueue.main.async {
+                if returnCode.isSuccess() {
+                    completion(.success(()))
+                } else if returnCode.isCancel() {
+                    completion(.failure(.cancelled))
+                } else {
+                    completion(.failure(.generic(String(returnCode.getValue()))))
+                    MXLog.error("""
+                        Failed converting voice message with state: \(String(describing: FFmpegKitConfig.sessionState(toString: session.getState()))), \
+                        returnCode: \(String(describing: returnCode)), \
+                        stackTrace: \(String(describing: session.getFailStackTrace()))
+                        """)
+                }
+            }
+        }
+    }
+}
diff --git a/Riot/Modules/Room/VoiceMessages/VoiceMessageController.swift b/Riot/Modules/Room/VoiceMessages/VoiceMessageController.swift
index ce96062b2..d3e044ce3 100644
--- a/Riot/Modules/Room/VoiceMessages/VoiceMessageController.swift
+++ b/Riot/Modules/Room/VoiceMessages/VoiceMessageController.swift
@@ -188,10 +188,23 @@ public class VoiceMessageController: NSObject, VoiceMessageToolbarViewDelegate,
     
     // MARK: - Private
     
-    private func sendRecordingAtURL(_ url: URL) {
-        delegate?.voiceMessageController(self, didRequestSendForFileAtURL: url) { [weak self] success in
-            UINotificationFeedbackGenerator().notificationOccurred( (success ? .success : .error))
-            self?.deleteRecordingAtURL(url)
+    private func sendRecordingAtURL(_ sourceURL: URL) {
+        
+        let destinationURL = sourceURL.deletingPathExtension().appendingPathExtension("opus")
+        
+        VoiceMessageAudioConverter.convertToOpusOgg(sourceURL: sourceURL, destinationURL: destinationURL) { [weak self] result in
+            guard let self = self else { return }
+            
+            switch result {
+            case .success:
+                self.delegate?.voiceMessageController(self, didRequestSendForFileAtURL: destinationURL) { [weak self] success in
+                    UINotificationFeedbackGenerator().notificationOccurred((success ? .success : .error))
+                    self?.deleteRecordingAtURL(sourceURL)
+                    self?.deleteRecordingAtURL(destinationURL)
+                }
+            case .failure(let error):
+                MXLog.error("Failed failed encoding audio message with: \(error)")
+            }
         }
     }
     
diff --git a/Riot/Modules/Room/VoiceMessages/VoiceMessagePlaybackController.swift b/Riot/Modules/Room/VoiceMessages/VoiceMessagePlaybackController.swift
index 836204029..dedbd3919 100644
--- a/Riot/Modules/Room/VoiceMessages/VoiceMessagePlaybackController.swift
+++ b/Riot/Modules/Room/VoiceMessages/VoiceMessagePlaybackController.swift
@@ -147,7 +147,7 @@ class VoiceMessagePlaybackController: VoiceMessageAudioPlayerDelegate, VoiceMess
         
         if attachment.isEncrypted {
             attachment.decrypt(toTempFile: { [weak self] filePath in
-                self?.loadFileAtPath(filePath)
+                self?.convertAndLoadFileAtPath(filePath)
             }, failure: { [weak self] error in
                 // A nil error in this case is a cancellation on the MXMediaLoader
                 if let error = error {
@@ -157,7 +157,7 @@ class VoiceMessagePlaybackController: VoiceMessageAudioPlayerDelegate, VoiceMess
             })
         } else {
             attachment.prepare({ [weak self] in
-                self?.loadFileAtPath(attachment.cacheFilePath)
+                self?.convertAndLoadFileAtPath(attachment.cacheFilePath)
             }, failure: { [weak self] error in
                 // A nil error in this case is a cancellation on the MXMediaLoader
                 if let error = error {
@@ -168,26 +168,28 @@ class VoiceMessagePlaybackController: VoiceMessageAudioPlayerDelegate, VoiceMess
         }
     }
     
-    private func loadFileAtPath(_ path: String?) {
+    private func convertAndLoadFileAtPath(_ path: String?) {
         guard let filePath = path else {
             return
         }
         
-        let url = URL(fileURLWithPath: filePath)
+        let temporaryDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
+        let newURL = temporaryDirectoryURL.appendingPathComponent(ProcessInfo().globallyUniqueString).appendingPathExtension("m4a")
         
-        // AVPlayer doesn't want to play it otherwise. https://stackoverflow.com/a/9350824
-        let newURL = url.appendingPathExtension("m4a")
-        
-        do {
-            try? FileManager.default.removeItem(at: newURL)
-            try FileManager.default.moveItem(at: url, to: newURL)
-        } catch {
-            self.state = .error
-            MXLog.error("Failed appending voice message extension.")
-            return
+        VoiceMessageAudioConverter.convertToMPEG4AAC(sourceURL: URL(fileURLWithPath: filePath), destinationURL: newURL) { [weak self] result in
+            switch result {
+            case .success:
+                self?.loadFileAtURL(newURL)
+            case .failure(let error):
+                self?.state = .error
+                MXLog.error("Failed failed decoding audio message with: \(error)")
+            }
         }
+    }
+    
+    private func loadFileAtURL(_ url: URL) {
         
-        audioPlayer.loadContentFromURL(newURL)
+        audioPlayer.loadContentFromURL(url)
         
         let requiredNumberOfSamples = playbackView.getRequiredNumberOfSamples()
         
@@ -195,7 +197,7 @@ class VoiceMessagePlaybackController: VoiceMessageAudioPlayerDelegate, VoiceMess
             return
         }
         
-        let analyser = WaveformAnalyzer(audioAssetURL: newURL)
+        let analyser = WaveformAnalyzer(audioAssetURL: url)
         analyser?.samples(count: requiredNumberOfSamples, completionHandler: { [weak self] samples in
             guard let samples = samples else {
                 self?.state = .error
diff --git a/Riot/SupportingFiles/Riot-Bridging-Header.h b/Riot/SupportingFiles/Riot-Bridging-Header.h
index 3292be7d4..3333b1805 100644
--- a/Riot/SupportingFiles/Riot-Bridging-Header.h
+++ b/Riot/SupportingFiles/Riot-Bridging-Header.h
@@ -5,6 +5,8 @@
 @import MatrixSDK;
 @import MatrixKit;
 
+#include <ffmpegkit/FFmpegKit.h>
+
 #import "WebViewViewController.h"
 #import "RiotSplitViewController.h"
 #import "RiotNavigationController.h"