diff --git a/src/components/MicRecorder.tsx b/src/components/MicRecorder.tsx
index c873166..f73c49f 100644
--- a/src/components/MicRecorder.tsx
+++ b/src/components/MicRecorder.tsx
@@ -22,7 +22,7 @@ const MicRecorder = (props: MicRecorderProps) => {
   let mediaStream: MediaStream | null = null;
   let audioChunks: Blob[] = [];
 
-  const preferredMimeType = "audio/webm; codecs=opus";
+  const preferredMimeType = "audio/webm;codecs=opus";
   const fallbackMimeType = "audio/webm";
 
   const startRecording = async () => {
@@ -49,11 +49,12 @@ const MicRecorder = (props: MicRecorderProps) => {
       if (!audioTrack) throw "no audio track found";
 
       let mimeType = "";
-      if (MediaRecorder.isTypeSupported(preferredMimeType))
+      if (MediaRecorder.isTypeSupported(preferredMimeType)) {
         mimeType = preferredMimeType;
-      else if (MediaRecorder.isTypeSupported(fallbackMimeType))
+      } else if (MediaRecorder.isTypeSupported(fallbackMimeType)) {
+        console.warn(`falling back to ${fallbackMimeType} for recording audio`);
         mimeType = fallbackMimeType;
-      else {
+      } else {
         console.warn(
           `browser does not support preffered audio / container type.
           falling back to whatever the browser picks`,
@@ -98,6 +99,8 @@ const MicRecorder = (props: MicRecorderProps) => {
           type: usedMime,
         });
 
+        console.info(usedMime, file.size);
+
         addTask(props.selectedAccount(), file);
         audioChunks = [];
       };
diff --git a/src/lib/render.ts b/src/lib/render.ts
index adb5751..ab7ed08 100644
--- a/src/lib/render.ts
+++ b/src/lib/render.ts
@@ -274,7 +274,7 @@ export const render = async (file: File, opts: RenderOptions) => {
   if (!audioTrack) throw "no audio track found.";
 
   if (!(await audioTrack.canDecode()))
-    throw "audio track cannot be decoded by browser.";
+    throw `audio track (${audioTrack.codec}) cannot be decoded by browser.`;
 
   const duration = opts.duration ?? (await audioTrack.computeDuration());
   if (!duration) throw "couldn't get audio duration.";