From 749bd8009108547ed5fef4f7498e67ff72287698 Mon Sep 17 00:00:00 2001
From: jasonKercher <jkercher43@gmail.com>
Date: Mon, 13 Jul 2020 08:29:54 -0400
Subject: [PATCH] Merge pull request #17770 from jasonKercher:3.4_triggered

3.4 Allow first capture to return false

* fix first capture timeout

* fix first capture timeout
---
 modules/videoio/src/cap_v4l.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/modules/videoio/src/cap_v4l.cpp b/modules/videoio/src/cap_v4l.cpp
index dc82e84571..555af5a1a2 100644
--- a/modules/videoio/src/cap_v4l.cpp
+++ b/modules/videoio/src/cap_v4l.cpp
@@ -1033,15 +1033,16 @@ bool CvCaptureCAM_V4L::grabFrame()
             return false;
         }
 
+        // No need to skip this if the first read returns false
+        /* preparation is ok */
+        FirstCapture = false;
+
 #if defined(V4L_ABORT_BADJPEG)
         // skip first frame. it is often bad -- this is unnotied in traditional apps,
         //  but could be fatal if bad jpeg is enabled
         if (!read_frame_v4l2())
             return false;
 #endif
-
-        /* preparation is ok */
-        FirstCapture = false;
     }
     // In the case that the grab frame was without retrieveFrame
     if (bufferIndex >= 0)