diff -Nru qtmultimedia-opensource-src-5.15.2/debian/changelog qtmultimedia-opensource-src-5.15.2/debian/changelog
--- qtmultimedia-opensource-src-5.15.2/debian/changelog	2020-12-11 08:31:59.000000000 +0000
+++ qtmultimedia-opensource-src-5.15.2/debian/changelog	2021-02-20 17:37:17.000000000 +0000
@@ -1,3 +1,11 @@
+qtmultimedia-opensource-src (5.15.2-3) unstable; urgency=medium
+
+  * Add a patch to increase buffer sizes in tst_QVideoFrame::image() test,
+    to fix segmentation fault that sometimes happens (closes: #982973).
+  * Update debian/watch: use format 4, and track only 5.15.x releases.
+
+ -- Dmitry Shachnev <mitya57@debian.org>  Sat, 20 Feb 2021 20:37:17 +0300
+
 qtmultimedia-opensource-src (5.15.2-2) unstable; urgency=medium
 
   * Bump Standards-Version to 4.5.1, no changes needed.
diff -Nru qtmultimedia-opensource-src-5.15.2/debian/patches/series qtmultimedia-opensource-src-5.15.2/debian/patches/series
--- qtmultimedia-opensource-src-5.15.2/debian/patches/series	2020-12-11 08:31:59.000000000 +0000
+++ qtmultimedia-opensource-src-5.15.2/debian/patches/series	2021-02-20 17:37:17.000000000 +0000
@@ -1 +1,2 @@
 rpath_nonlinux.diff
+test_buffer_size.diff
diff -Nru qtmultimedia-opensource-src-5.15.2/debian/patches/test_buffer_size.diff qtmultimedia-opensource-src-5.15.2/debian/patches/test_buffer_size.diff
--- qtmultimedia-opensource-src-5.15.2/debian/patches/test_buffer_size.diff	1970-01-01 00:00:00.000000000 +0000
+++ qtmultimedia-opensource-src-5.15.2/debian/patches/test_buffer_size.diff	2021-02-20 17:37:17.000000000 +0000
@@ -0,0 +1,41 @@
+Description: increase buffer sizes used in tst_QVideoFrame::image() tests
+Author: Dmitry Shachnev <mitya57@debian.org>
+Forwarded: https://codereview.qt-project.org/c/qt/qtmultimedia/+/335592
+Last-Update: 2021-02-20
+
+--- a/tests/auto/unit/qvideoframe/tst_qvideoframe.cpp
++++ b/tests/auto/unit/qvideoframe/tst_qvideoframe.cpp
+@@ -1244,14 +1244,14 @@ void tst_QVideoFrame::image_data()
+     QTest::newRow("64x64 YUV420P")
+             << QSize(64, 64)
+             << QVideoFrame::Format_YUV420P
+-            << 13288
++            << 18432
+             << 256
+             << QImage::Format_ARGB32;
+ 
+     QTest::newRow("64x64 YV12")
+             << QSize(64, 64)
+             << QVideoFrame::Format_YV12
+-            << 16384
++            << 18432
+             << 256
+             << QImage::Format_ARGB32;
+ 
+@@ -1272,14 +1272,14 @@ void tst_QVideoFrame::image_data()
+     QTest::newRow("64x64 NV12")
+             << QSize(64, 64)
+             << QVideoFrame::Format_NV12
+-            << 16384
++            << 24576
+             << 256
+             << QImage::Format_ARGB32;
+ 
+     QTest::newRow("64x64 NV21")
+             << QSize(64, 64)
+             << QVideoFrame::Format_NV21
+-            << 16384
++            << 24576
+             << 256
+             << QImage::Format_ARGB32;
+ #endif
diff -Nru qtmultimedia-opensource-src-5.15.2/debian/watch qtmultimedia-opensource-src-5.15.2/debian/watch
--- qtmultimedia-opensource-src-5.15.2/debian/watch	2020-12-11 08:31:59.000000000 +0000
+++ qtmultimedia-opensource-src-5.15.2/debian/watch	2021-02-20 17:37:17.000000000 +0000
@@ -1,2 +1,2 @@
-version=3
-https://download.qt.io/official_releases/qt/([\d\.]*)/([\d\.]*)/submodules/qtmultimedia-everywhere-src-([^-]*)\.tar\.xz
+version=4
+https://download.qt.io/archive/qt/5.15/([\d\.]*)/submodules/qtmultimedia-everywhere-src-([^-]*)\.tar\.xz