From 00b6f39201f822204f1a8a4c97f7b77c08f123fd Mon Sep 17 00:00:00 2001
From: emil28092005 <emil28092005@users.noreply.github.com>
Date: Fri, 19 Jun 2026 09:01:55 +0300
Subject: [PATCH] fix: video recording captures every frame + dynamic FPS for
 FFmpeg
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Removed skipFrames logic — capture every frame for reliability
- FFmpeg framerate set to actual FPS (capped at 60) instead of hardcoded 30
- Added -vf fps=30 filter to downsample to 30fps in output
- First frame: CapturedFrame is null (no previous capture), skipped naturally
- Second frame onwards: data available from previous frame's GPU copy
---
 Videos/cortex_20260619_090013.mp4 | Bin 0 -> 261 bytes
 src/CortexEngine.App/Program.cs   |  34 +++++++++++++-----------------
 2 files changed, 15 insertions(+), 19 deletions(-)
 create mode 100644 Videos/cortex_20260619_090013.mp4

diff --git a/Videos/cortex_20260619_090013.mp4 b/Videos/cortex_20260619_090013.mp4
new file mode 100644
index 0000000000000000000000000000000000000000..862f49648777ee248bc8b232c07d0600e621c1fa
GIT binary patch
literal 261
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zos(OZkpiTV0P_nlhmnB+h!6mU0~AK%J0MhIV=(~*6H8M{5`lDNZYr1tsZ-2I$teOc
yKp;0Ivna8kAP2&OkUE(;#UKZ(tSrgT2huV?_k#=pTkn%tmS$$8XRK#vU;qH;LL|HZ

literal 0
HcmV?d00001

diff --git a/src/CortexEngine.App/Program.cs b/src/CortexEngine.App/Program.cs
index b3edcb0..d096435 100644
--- a/src/CortexEngine.App/Program.cs
+++ b/src/CortexEngine.App/Program.cs
@@ -328,7 +328,8 @@ class Program
 
                             var w = window.Width;
                             var h = window.Height;
-                            var ffmpegArgs = $"-y -f rawvideo -pixel_format rgba -video_size {w}x{h} -framerate 30 -i - -c:v libx264 -preset fast -crf 23 -pix_fmt yuv420p {recordingPath}";
+                            var fps = (int)Math.Round(1000.0 / timing.DeltaTime);
+                            var ffmpegArgs = $"-y -f rawvideo -pixel_format rgba -video_size {w}x{h} -framerate {Math.Min(fps, 60)} -i - -c:v libx264 -preset fast -crf 23 -pix_fmt yuv420p -vf fps=30 {recordingPath}";
 
                             var psi = new ProcessStartInfo
                             {
@@ -388,30 +389,25 @@ class Program
 
                 renderer.RenderWorld(world);
                 queue.CompletePendingScreenshots();
-
                 // If recording, get captured frame and write to FFmpeg
                 if (isRecording && ffmpegProcess != null && !ffmpegProcess.HasExited)
                 {
-                    skipFrames++;
-                    if (skipFrames >= 2) // Capture every 2nd frame for 30fps at ~60fps
+                    var frameData = vkRenderer.CapturedFrame;
+                    if (frameData != null && frameData.Length > 0)
                     {
-                        skipFrames = 0;
-                        var frameData = vkRenderer.CapturedFrame;
-                        if (frameData != null && frameData.Length > 0)
+                        try
                         {
-                            try
-                            {
-                                ffmpegProcess.StandardInput.BaseStream.Write(frameData, 0, frameData.Length);
-                                ffmpegProcess.StandardInput.BaseStream.Flush();
-                                recordedFrames++;
-                            }
-                            catch (Exception ex)
-                            {
-                                Console.WriteLine($"[App] FFmpeg write error: {ex.Message}");
-                                isRecording = false;
-                            }
+                            ffmpegProcess.StandardInput.BaseStream.Write(frameData, 0, frameData.Length);
+                            ffmpegProcess.StandardInput.BaseStream.Flush();
+                            recordedFrames++;
                         }
-                    }                }
+                        catch (Exception ex)
+                        {
+                            Console.WriteLine($"[App] FFmpeg write error: {ex.Message}");
+                            isRecording = false;
+                        }
+                    }
+                }
 
                 frames++;
                 if (timing.TotalTime - lastFpsTime >= 1.0)