Add 'how many times' is the speed of transcoding in Playback Info (#5753)

* feat: new display value for transcoding fps

* fix: undefined safety + || instead of ??

* forgot to add to contributors

* fix: apply suggestions

* chore: remove from contrib to rebase

* chore: add to contrib again

---------

Co-authored-by: Bill Thornton <thornbill@users.noreply.github.com>

CONTRIBUTORS.md

@@ -91,6 +91,7 @@
 - [Chaitanya Shahare](https://github.com/Chaitanya-Shahare)
 - [Venkat Karasani](https://github.com/venkat-karasani)
 - [Connor Smith](https://github.com/ConnorS1110)
+- [iFraan](https://github.com/iFraan)
 
 ## Emby Contributors
 

src/components/playerstats/playerstats.js

@@ -163,7 +163,7 @@ function getTranscodingStats(session, player, displayPlayMethod) {
         if (session.TranscodingInfo.Framerate) {
             sessionStats.push({
                 label: globalize.translate('LabelTranscodingFramerate'),
-                value: session.TranscodingInfo.Framerate + ' fps'
+                value: getDisplayTranscodeFps(session, player)
             });
         }
         if (session.TranscodingInfo.TranscodeReasons?.length) {
@@ -191,6 +191,20 @@ function getDisplayBitrate(bitrate) {
     }
 }
 
+function getDisplayTranscodeFps(session, player) {
+    const mediaSource = playbackManager.currentMediaSource(player) || {};
+    const videoStream = (mediaSource.MediaStreams || []).find((s) => s.Type === 'Video') || {};
+
+    const originalFramerate = videoStream.AverageFrameRate;
+    const transcodeFramerate = session.TranscodingInfo.Framerate;
+
+    if (!originalFramerate) {
+        return `${transcodeFramerate} fps`;
+    }
+
+    return `${(transcodeFramerate / originalFramerate).toFixed(2)}x (${transcodeFramerate} fps)`;
+}
+
 function getReadableSize(size) {
     if (size >= 1073741824) {
         return parseFloat((size / 1073741824).toFixed(1)) + ' GiB';