From 257ce496682b83ee9631e32ab5b84266078f4d21 Mon Sep 17 00:00:00 2001
From: realzombee <209545148+realzombee@users.noreply.github.com>
Date: Wed, 28 Jan 2026 01:58:54 +0000
Subject: [PATCH] fix(ffprobe): Pass the correct filtered video stream index -
 We currently pass the global stream index of the primary video stream with
 v:index. - ffprobe expects the index to be filtered by the stream type. If
 the video appears at index 2 but is the only video stream in the file, we
 should pass v:0. Passing v:2 will cause ffprobe to unnecessarily read the
 entire file during analysis

---
 .../MediaFiles/MediaInfo/VideoFileInfoReader.cs              | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/NzbDrone.Core/MediaFiles/MediaInfo/VideoFileInfoReader.cs b/src/NzbDrone.Core/MediaFiles/MediaInfo/VideoFileInfoReader.cs
index cbfb17e888..f5baf4323f 100644
--- a/src/NzbDrone.Core/MediaFiles/MediaInfo/VideoFileInfoReader.cs
+++ b/src/NzbDrone.Core/MediaFiles/MediaInfo/VideoFileInfoReader.cs
@@ -117,7 +117,10 @@ public MediaInfoModel GetMediaInfo(string filename)
                 // if it looks like PQ10 or similar HDR, do a frame analysis to figure out which type it is
                 if (PqTransferFunctions.Contains(mediaInfoModel.VideoTransferCharacteristics))
                 {
-                    var frameOutput = FFProbe.GetFrameJson(filename, ffOptions: new () { ExtraArguments = $"-read_intervals \"%+#1\" -select_streams v:{primaryVideoStream?.Index ?? 0}" });
+                    var videoStreamIndex = analysis.VideoStreams.FindIndex(stream => stream.Index == primaryVideoStream?.Index);
+                    videoStreamIndex = videoStreamIndex == -1 ? 0 : videoStreamIndex;
+                    _logger.Debug("Reading video stream at index {0} with relative index v:{1}", primaryVideoStream?.Index, videoStreamIndex);
+                    var frameOutput = FFProbe.GetFrameJson(filename, ffOptions: new () { ExtraArguments = $"-read_intervals \"%+#1\" -select_streams v:{videoStreamIndex}" });
                     mediaInfoModel.RawFrameData = frameOutput;
 
                     frames = FFProbe.AnalyseFrameJson(frameOutput);