From 26fcfcc206ad4a2ff841c1e0ad43ab0e76107d45 Mon Sep 17 00:00:00 2001
From: Stanislau Krashynski <Stanislau.Krashynski@itechart-group.com>
Date: Mon, 20 Sep 2021 16:06:43 +0300
Subject: [PATCH] fix stream index for passing to ffmpeg while making a
 snapshot

---
 FFMpegCore/FFMpeg/FFMpeg.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/FFMpegCore/FFMpeg/FFMpeg.cs b/FFMpegCore/FFMpeg/FFMpeg.cs
index a345160..ed3d390 100644
--- a/FFMpegCore/FFMpeg/FFMpeg.cs
+++ b/FFMpegCore/FFMpeg/FFMpeg.cs
@@ -116,7 +116,12 @@ private static (FFMpegArguments, Action<FFMpegArgumentOptions> outputOptions) Bu
         {
             captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
             size = PrepareSnapshotSize(source, size);
-            streamIndex = streamIndex == null ? 0 : source.VideoStreams.FirstOrDefault(videoStream => videoStream.Index == streamIndex).Index;
+            if (streamIndex == null)
+            {
+                streamIndex = source.PrimaryVideoStream?.Index
+                    ?? source.VideoStreams.First()?.Index
+                    ?? 0;
+            }
 
             return (FFMpegArguments
                 .FromFileInput(input, false, options => options