[opencv] 36/53: Unhandled Objective-C exception when playing video

[Nobuhiro Iwamatsu]

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iwamatsu pushed a commit to annotated tag 2.4.13.3
in repository opencv.

commit f71bf21aaffec67739390c9fb58eafed68a35eae
Author: Sabelo <sabelo at sabelo.io>
Date:   Fri Jun 23 19:54:56 2017 -0400

    Unhandled Objective-C exception when playing video
---
 modules/highgui/src/cap_avfoundation_mac.mm | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/modules/highgui/src/cap_avfoundation_mac.mm b/modules/highgui/src/cap_avfoundation_mac.mm
index b5e3ffc..c56795d 100644
--- a/modules/highgui/src/cap_avfoundation_mac.mm
+++ b/modules/highgui/src/cap_avfoundation_mac.mm
@@ -697,7 +697,15 @@ CvCaptureFile::CvCaptureFile(const char* filename) {
         return;
     }
 
-    mAssetTrack = [[mAsset tracksWithMediaType: AVMediaTypeVideo][0] retain];
+    NSArray *tracks = [mAsset tracksWithMediaType:AVMediaTypeAudio];
+    if ([tracks count] == 0) {
+      fprintf(stderr, "OpenCV: Couldn't read movie file \"%s\"\n", filename);
+      [localpool drain];
+      started = 0;
+      return;
+    }
+
+    mAssetTrack = [tracks[0] retain];
 
     if ( ! setupReadingAt(kCMTimeZero) ) {
         fprintf(stderr, "OpenCV: Couldn't read movie file \"%s\"\n", filename);

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