From 39889eeed810016fd7d277d8bbfcc58e6f305c82 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Thu, 28 Feb 2019 22:30:46 +0100
Subject: [PATCH] Fix a segfault that could happen with FFmpeg inputs and slow
 startup.

---
 nageru/mixer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nageru/mixer.cpp b/nageru/mixer.cpp
index 367094c..d1b52ef 100644
--- a/nageru/mixer.cpp
+++ b/nageru/mixer.cpp
@@ -795,7 +795,7 @@ void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 	card->last_timecode = timecode;
 
 	PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
-	if (card->type == CardType::FFMPEG_INPUT) {
+	if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
 		FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
 		userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
 		userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
-- 
2.39.2