diff --git a/media-video/ffmpeg/ffmpeg-4.4.5-r4.ebuild b/media-video/ffmpeg/ffmpeg-4.4.5-r4.ebuild
index d4caf866d4b34..3b7fde23b5165 100644
--- a/media-video/ffmpeg/ffmpeg-4.4.5-r4.ebuild
+++ b/media-video/ffmpeg/ffmpeg-4.4.5-r4.ebuild
@@ -447,6 +447,20 @@ multilib_src_configure() {
 		esac
 	fi
 
+	# skipping tests is handled at configure-time
+	local skip_tests=()
+
+	# zlib-ng is not bitexact w/ zlib producing mismatching md5sum (bug #965737)
+	has_version 'sys-libs/zlib-ng[compat]' &&
+		skip_tests+=(
+			lavf-{apng{,.png},gray16be.png,png,rgb48be.png}
+			mov-mp4-frag-flush
+			vsynth{1,2,3}-{flashsv,mpng,zlib}
+		)
+
+	(( ${#skip_tests[@]} )) &&
+		conf+=( --ignore-tests=$(IFS=,; echo "${skip_tests[*]}") )
+
 	# import options from FFMPEG_IUSE_MAP
 	local flag license mod v
 	local -A optmap=() licensemap=()
diff --git a/media-video/ffmpeg/ffmpeg-4.4.6-r1.ebuild b/media-video/ffmpeg/ffmpeg-4.4.6-r1.ebuild
index 1b3d236608fff..02b6717afa097 100644
--- a/media-video/ffmpeg/ffmpeg-4.4.6-r1.ebuild
+++ b/media-video/ffmpeg/ffmpeg-4.4.6-r1.ebuild
@@ -447,6 +447,20 @@ multilib_src_configure() {
 		esac
 	fi
 
+	# skipping tests is handled at configure-time
+	local skip_tests=()
+
+	# zlib-ng is not bitexact w/ zlib producing mismatching md5sum (bug #965737)
+	has_version 'sys-libs/zlib-ng[compat]' &&
+		skip_tests+=(
+			lavf-{apng{,.png},gray16be.png,png,rgb48be.png}
+			mov-mp4-frag-flush
+			vsynth{1,2,3}-{flashsv,mpng,zlib}
+		)
+
+	(( ${#skip_tests[@]} )) &&
+		conf+=( --ignore-tests=$(IFS=,; echo "${skip_tests[*]}") )
+
 	# import options from FFMPEG_IUSE_MAP
 	local flag license mod v
 	local -A optmap=() licensemap=()
diff --git a/media-video/ffmpeg/ffmpeg-6.1.3.ebuild b/media-video/ffmpeg/ffmpeg-6.1.3.ebuild
index bfb235e3dfcb4..5a2967e8930a3 100644
--- a/media-video/ffmpeg/ffmpeg-6.1.3.ebuild
+++ b/media-video/ffmpeg/ffmpeg-6.1.3.ebuild
@@ -505,6 +505,20 @@ multilib_src_configure() {
 		esac
 	fi
 
+	# skipping tests is handled at configure-time
+	local skip_tests=()
+
+	# zlib-ng is not bitexact w/ zlib producing mismatching md5sum (bug #965737)
+	has_version 'sys-libs/zlib-ng[compat]' &&
+		skip_tests+=(
+			lavf-{apng{,.png},gray16be.png,png,rgb48be.png}
+			mov-mp4-frag-flush
+			vsynth{1,2,3}-{flashsv,mpng,zlib}
+		)
+
+	(( ${#skip_tests[@]} )) &&
+		conf+=( --ignore-tests=$(IFS=,; echo "${skip_tests[*]}") )
+
 	# import options from FFMPEG_IUSE_MAP
 	local flag license mod v
 	local -A optmap=() licensemap=()
diff --git a/media-video/ffmpeg/ffmpeg-7.1.2.ebuild b/media-video/ffmpeg/ffmpeg-7.1.2.ebuild
index 165c65c836190..abcb1ae1c357c 100644
--- a/media-video/ffmpeg/ffmpeg-7.1.2.ebuild
+++ b/media-video/ffmpeg/ffmpeg-7.1.2.ebuild
@@ -519,6 +519,20 @@ multilib_src_configure() {
 		esac
 	fi
 
+	# skipping tests is handled at configure-time
+	local skip_tests=()
+
+	# zlib-ng is not bitexact w/ zlib producing mismatching md5sum (bug #965737)
+	has_version 'sys-libs/zlib-ng[compat]' &&
+		skip_tests+=(
+			lavf-{apng{,.png},gray16be.png,png,rgb48be.png}
+			mov-mp4-frag-flush
+			vsynth{1,2,3}-{flashsv,mpng,zlib}
+		)
+
+	(( ${#skip_tests[@]} )) &&
+		conf+=( --ignore-tests=$(IFS=,; echo "${skip_tests[*]}") )
+
 	# import options from FFMPEG_IUSE_MAP
 	local flag license mod v
 	local -A optmap=() licensemap=()
diff --git a/media-video/ffmpeg/ffmpeg-8.0.ebuild b/media-video/ffmpeg/ffmpeg-8.0.ebuild
index 974c497eedcd6..67ef4e1fa04f6 100644
--- a/media-video/ffmpeg/ffmpeg-8.0.ebuild
+++ b/media-video/ffmpeg/ffmpeg-8.0.ebuild
@@ -515,6 +515,20 @@ multilib_src_configure() {
 		esac
 	fi
 
+	# skipping tests is handled at configure-time
+	local skip_tests=()
+
+	# zlib-ng is not bitexact w/ zlib producing mismatching md5sum (bug #965737)
+	has_version 'sys-libs/zlib-ng[compat]' &&
+		skip_tests+=(
+			lavf-{apng{,.png},gray16be.png,png,rgb48be.png}
+			mov-mp4-frag-flush
+			vsynth{1,2,3}-{flashsv,mpng,zlib}
+		)
+
+	(( ${#skip_tests[@]} )) &&
+		conf+=( --ignore-tests=$(IFS=,; echo "${skip_tests[*]}") )
+
 	# import options from FFMPEG_IUSE_MAP
 	local flag license mod v
 	local -A optmap=() licensemap=()
diff --git a/media-video/ffmpeg/ffmpeg-9999.ebuild b/media-video/ffmpeg/ffmpeg-9999.ebuild
index 9d88f584adca6..3d8cc53f07fbc 100644
--- a/media-video/ffmpeg/ffmpeg-9999.ebuild
+++ b/media-video/ffmpeg/ffmpeg-9999.ebuild
@@ -520,6 +520,20 @@ multilib_src_configure() {
 		esac
 	fi
 
+	# skipping tests is handled at configure-time
+	local skip_tests=()
+
+	# zlib-ng is not bitexact w/ zlib producing mismatching md5sum (bug #965737)
+	has_version 'sys-libs/zlib-ng[compat]' &&
+		skip_tests+=(
+			lavf-{apng{,.png},gray16be.png,png,rgb48be.png}
+			mov-mp4-frag-flush
+			vsynth{1,2,3}-{flashsv,mpng,zlib}
+		)
+
+	(( ${#skip_tests[@]} )) &&
+		conf+=( --ignore-tests=$(IFS=,; echo "${skip_tests[*]}") )
+
 	# import options from FFMPEG_IUSE_MAP
 	local flag license mod v
 	local -A optmap=() licensemap=()