diff --git a/docs b/docs
index 2ba734c6c..165aa82a2 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 2ba734c6c105ed5c830a97889b943452b18dc196
+Subproject commit 165aa82a200e8fdee2c23550178b003601d639a6
diff --git a/src/Loop/VoIP/DjLoop.php b/src/Loop/VoIP/DjLoop.php
index 62936b7c6..1644913af 100644
--- a/src/Loop/VoIP/DjLoop.php
+++ b/src/Loop/VoIP/DjLoop.php
@@ -26,9 +26,11 @@ use Amp\Cancellation;
 use Amp\CancelledException;
 use Amp\DeferredCancellation;
 use Amp\DeferredFuture;
+use AssertionError;
 use danog\Loop\Loop;
 use danog\MadelineProto\LocalFile;
 use danog\MadelineProto\Loop\VoIPLoop;
+use danog\MadelineProto\Magic;
 use danog\MadelineProto\Ogg;
 use danog\MadelineProto\RemoteUrl;
 use danog\MadelineProto\VoIP;
@@ -199,6 +201,9 @@ final class DjLoop extends VoIPLoop
             }
         }
         if (!$it) {
+            if (!Magic::canConvertOgg()) {
+                throw new AssertionError("The passed file was not generated by MadelineProto or @libtgvoipbot, please pre-convert it using @libtgvoip bot or install FFI and ffmpeg to perform realtime conversion!");
+            }
             $this->instance->log("Starting conversion fiber...");
             $pipe = new Pipe(4096);
             EventLoop::queue(function () use ($f, $pipe, $cancellation): void {
diff --git a/src/Magic.php b/src/Magic.php
index e07b60e8b..30c61c586 100644
--- a/src/Magic.php
+++ b/src/Magic.php
@@ -20,6 +20,8 @@ declare(strict_types=1);
 
 namespace danog\MadelineProto;
 
+use Amp\ByteStream\ReadableBuffer;
+use Amp\ByteStream\WritableBuffer;
 use Amp\DeferredFuture;
 use Amp\SignalException;
 use danog\MadelineProto\TL\Conversion\Extension;
@@ -389,4 +391,18 @@ final class Magic
             self::$initedIpv6 = true;
         }
     }
+
+    private static ?bool $canConvert = null;
+    public static function canConvertOgg(): bool {
+        if (self::$canConvert !== null) {
+            return self::$canConvert;
+        }
+        try {
+            Ogg::convert(new ReadableBuffer("\0"), new WritableBuffer);
+            self::$canConvert = true;
+        } catch (\Throwable) {
+            self::$canConvert = false;
+        }
+        return self::$canConvert;
+    }
 }
diff --git a/src/Ogg.php b/src/Ogg.php
index 82c523c5b..426302c3b 100644
--- a/src/Ogg.php
+++ b/src/Ogg.php
@@ -541,7 +541,13 @@ final class Ogg
      */
     public static function validateOgg(LocalFile|RemoteUrl|ReadableStream $f): void
     {
-        foreach ((new self($f))->opusPackets as $p) {
+        $ok = false;
+        try {
+            $ogg = new self($f);
+            $ok = \in_array('MADELINE_ENCODER_V=1', $ogg->comments, true);
+        } catch (\Throwable) {}
+        if (!$ok) {
+            throw new AssertionError("The passed file was not generated by MadelineProto or @libtgvoipbot, please pre-convert it using @libtgvoip bot or install FFI and ffmpeg to perform realtime conversion!");
         }
     }
 
diff --git a/src/VoIP/AuthKeyHandler.php b/src/VoIP/AuthKeyHandler.php
index a04fb68a0..5e32f9a07 100644
--- a/src/VoIP/AuthKeyHandler.php
+++ b/src/VoIP/AuthKeyHandler.php
@@ -26,6 +26,7 @@ use danog\MadelineProto\LocalFile;
 use danog\MadelineProto\Logger;
 use danog\MadelineProto\Magic;
 use danog\MadelineProto\MTProtoTools\Crypt;
+use danog\MadelineProto\Ogg;
 use danog\MadelineProto\PeerNotInDbException;
 use danog\MadelineProto\RemoteUrl;
 use danog\MadelineProto\VoIP;
@@ -161,6 +162,11 @@ trait AuthKeyHandler
      */
     public function callPlay(int $id, LocalFile|RemoteUrl|ReadableStream $file): void
     {
+        if (!Magic::canConvertOgg()) {
+            if ($file instanceof LocalFile) {
+                Ogg::validateOgg($file);
+            }
+        }
         ($this->calls[$id] ?? null)?->play($file);
     }
 
@@ -174,7 +180,7 @@ trait AuthKeyHandler
         if (!isset($this->calls[$id])) {
             return;
         }
-        $this->calls[$id]->play($file);
+        $this->callPlay($id, $file);
         if ($file instanceof ReadableStream) {
             $deferred = new DeferredFuture;
             $file->onClose($deferred->complete(...));
@@ -227,6 +233,13 @@ trait AuthKeyHandler
      */
     public function callPlayOnHold(int $id, LocalFile|RemoteUrl|ReadableStream ...$files): void
     {
+        if (!Magic::canConvertOgg()) {
+            foreach ($files as $file) {
+                if ($file instanceof LocalFile) {
+                    Ogg::validateOgg($file);
+                }
+            }
+        }
         ($this->calls[$id] ?? null)?->playOnHold(...$files);
     }
 
@@ -240,7 +253,7 @@ trait AuthKeyHandler
         if (!isset($this->calls[$id])) {
             return;
         }
-        $this->calls[$id]->playOnHold(...$files);
+        $this->callPlayOnHold($id, ...$files);
         foreach ($files as $file) {
             if ($file instanceof ReadableStream) {
                 $deferred = new DeferredFuture;