diff --git a/subprojects/gst-devtools/validate/data/gstvalidate.supp b/subprojects/gst-devtools/validate/data/gstvalidate.supp
index a3d01bfb04..9ab0482431 100644
--- a/subprojects/gst-devtools/validate/data/gstvalidate.supp
+++ b/subprojects/gst-devtools/validate/data/gstvalidate.supp
@@ -26,6 +26,17 @@
    fun:glXQueryVersion
 }
 
+{
+   This use of uninitialized memory is fixed in latest GLib
+   Memcheck:Value8
+   fun:UnknownInlinedFun
+   fun:UnknownInlinedFun
+   fun:UnknownInlinedFun
+   fun:g_checksum_get_string
+   fun:g_compute_checksum_for_data
+   ...
+}
+
 {
    Leak in mesa fixed with http://lists.freedesktop.org/archives/mesa-dev/2015-April/082100.html
    Memcheck:Leak
diff --git a/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded.validatetest b/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded.validatetest
new file mode 100644
index 0000000000..0836a7e890
--- /dev/null
+++ b/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded.validatetest
@@ -0,0 +1,21 @@
+# Check that `fakevideodec` works in "encoded video" mode
+meta,
+    handles-states=true,
+    args = {
+         "appsrc name=src format=time  ! fakevideodec name=dec ! videoconvert ! $(videosink)",
+    },
+    configs = {
+       "$(validateflow), pad=dec:sink, buffers-checksum=as-id, ignored-event-types={ tag, stream-start }",
+       "$(validateflow), pad=dec:src, buffers-checksum=as-id, ignored-event-types={ tag, stream-start }",
+    }
+
+foreach,
+  i=[0, 20],
+  actions={
+    [appsrc-push, target-element-name=src, fill-mode=counter, pts="$(i)/20", duration=1.0, size=8,
+        caps=(GstCaps)[video/x-h264,framerate=20/1,width=640,height=480,parsed=true]],
+  }
+
+appsrc-eos, target-element-name=src
+
+play
diff --git a/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded/flow-expectations/log-dec-sink-expected b/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded/flow-expectations/log-dec-sink-expected
new file mode 100644
index 0000000000..1159797dfa
--- /dev/null
+++ b/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded/flow-expectations/log-dec-sink-expected
@@ -0,0 +1,23 @@
+event caps: video/x-h264, framerate=(fraction)20/1, height=(int)480, parsed=(boolean)true, width=(int)640;
+event segment: format=TIME, start=0:00:00.000000000, offset=0:00:00.000000000, stop=none, time=0:00:00.000000000, base=0:00:00.000000000, position=0:00:00.000000000
+buffer: content-id=0, pts=0:00:00.000000000, dur=0:00:01.000000000, flags=discont
+buffer: content-id=2, pts=0:00:00.050000000, dur=0:00:01.000000000
+buffer: content-id=4, pts=0:00:00.100000000, dur=0:00:01.000000000
+buffer: content-id=6, pts=0:00:00.150000000, dur=0:00:01.000000000
+buffer: content-id=8, pts=0:00:00.200000000, dur=0:00:01.000000000
+buffer: content-id=10, pts=0:00:00.250000000, dur=0:00:01.000000000
+buffer: content-id=12, pts=0:00:00.300000000, dur=0:00:01.000000000
+buffer: content-id=14, pts=0:00:00.350000000, dur=0:00:01.000000000
+buffer: content-id=16, pts=0:00:00.400000000, dur=0:00:01.000000000
+buffer: content-id=18, pts=0:00:00.450000000, dur=0:00:01.000000000
+buffer: content-id=20, pts=0:00:00.500000000, dur=0:00:01.000000000
+buffer: content-id=22, pts=0:00:00.550000000, dur=0:00:01.000000000
+buffer: content-id=24, pts=0:00:00.600000000, dur=0:00:01.000000000
+buffer: content-id=26, pts=0:00:00.650000000, dur=0:00:01.000000000
+buffer: content-id=28, pts=0:00:00.700000000, dur=0:00:01.000000000
+buffer: content-id=30, pts=0:00:00.750000000, dur=0:00:01.000000000
+buffer: content-id=32, pts=0:00:00.800000000, dur=0:00:01.000000000
+buffer: content-id=34, pts=0:00:00.850000000, dur=0:00:01.000000000
+buffer: content-id=36, pts=0:00:00.900000000, dur=0:00:01.000000000
+buffer: content-id=38, pts=0:00:00.950000000, dur=0:00:01.000000000
+event eos: (no structure)
diff --git a/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded/flow-expectations/log-dec-src-expected b/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded/flow-expectations/log-dec-src-expected
new file mode 100644
index 0000000000..b04ecea214
--- /dev/null
+++ b/subprojects/gst-plugins-base/tests/validate/fakevideodec/encoded/flow-expectations/log-dec-src-expected
@@ -0,0 +1,23 @@
+event caps: video/x-raw, colorimetry=(string)0:1:0:0, format=(string)RGBA, framerate=(fraction)20/1, height=(int)480, interlace-mode=(string)progressive, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, multiview-mode=(string)mono, pixel-aspect-ratio=(fraction)1/1, width=(int)640;
+event segment: format=TIME, start=0:00:00.000000000, offset=0:00:00.000000000, stop=none, time=0:00:00.000000000, base=0:00:00.000000000, position=0:00:00.000000000
+buffer: content-id=1, pts=0:00:00.000000000, dur=0:00:01.000000000, flags=discont, meta=GstVideoMeta
+buffer: content-id=3, pts=0:00:00.050000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=5, pts=0:00:00.100000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=7, pts=0:00:00.150000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=9, pts=0:00:00.200000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=11, pts=0:00:00.250000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=13, pts=0:00:00.300000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=15, pts=0:00:00.350000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=17, pts=0:00:00.400000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=19, pts=0:00:00.450000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=21, pts=0:00:00.500000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=23, pts=0:00:00.550000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=25, pts=0:00:00.600000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=27, pts=0:00:00.650000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=29, pts=0:00:00.700000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=31, pts=0:00:00.750000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=33, pts=0:00:00.800000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=35, pts=0:00:00.850000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=37, pts=0:00:00.900000000, dur=0:00:01.000000000, meta=GstVideoMeta
+buffer: content-id=39, pts=0:00:00.950000000, dur=0:00:01.000000000, meta=GstVideoMeta
+event eos: (no structure)
diff --git a/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple.validatetest b/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple.validatetest
new file mode 100644
index 0000000000..9e9d794a22
--- /dev/null
+++ b/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple.validatetest
@@ -0,0 +1,9 @@
+# Check that `fakevideodec` works in "raw video" mode
+meta,
+    args = {
+         "videotestsrc num-buffers=5 ! video/x-raw,format=RGBA ! fakevideodec name=dec ! videoconvert ! $(videosink)",
+    },
+    configs = {
+       "$(validateflow), pad=dec:sink, buffers-checksum=as-id, ignored-event-types={ tag, stream-start }",
+       "$(validateflow), pad=dec:src, buffers-checksum=as-id, ignored-event-types={ tag, stream-start }",
+    }
diff --git a/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple/flow-expectations/log-dec-sink-expected b/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple/flow-expectations/log-dec-sink-expected
new file mode 100644
index 0000000000..9419c17f65
--- /dev/null
+++ b/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple/flow-expectations/log-dec-sink-expected
@@ -0,0 +1,8 @@
+event caps: video/x-raw, format=(string)RGBA, framerate=(fraction)30/1, height=(int)240, interlace-mode=(string)progressive, multiview-mode=(string)mono, pixel-aspect-ratio=(fraction)1/1, width=(int)320;
+event segment: format=TIME, start=0:00:00.000000000, offset=0:00:00.000000000, stop=none, time=0:00:00.000000000, base=0:00:00.000000000, position=0:00:00.000000000
+buffer: content-id=0, pts=0:00:00.000000000, dur=0:00:00.033333333, flags=discont
+buffer: content-id=1, pts=0:00:00.033333333, dur=0:00:00.033333333
+buffer: content-id=2, pts=0:00:00.066666666, dur=0:00:00.033333334
+buffer: content-id=3, pts=0:00:00.100000000, dur=0:00:00.033333333
+buffer: content-id=4, pts=0:00:00.133333333, dur=0:00:00.033333333
+event eos: (no structure)
diff --git a/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple/flow-expectations/log-dec-src-expected b/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple/flow-expectations/log-dec-src-expected
new file mode 100644
index 0000000000..4529fba7c3
--- /dev/null
+++ b/subprojects/gst-plugins-base/tests/validate/fakevideodec/simple/flow-expectations/log-dec-src-expected
@@ -0,0 +1,8 @@
+event caps: video/x-raw, colorimetry=(string)sRGB, format=(string)RGBA, framerate=(fraction)30/1, height=(int)240, interlace-mode=(string)progressive, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, multiview-mode=(string)mono, pixel-aspect-ratio=(fraction)1/1, width=(int)320;
+event segment: format=TIME, start=0:00:00.000000000, offset=0:00:00.000000000, stop=none, time=0:00:00.000000000, base=0:00:00.000000000, position=0:00:00.000000000
+buffer: content-id=0, pts=0:00:00.000000000, dur=0:00:00.033333333, flags=discont
+buffer: content-id=1, pts=0:00:00.033333333, dur=0:00:00.033333333
+buffer: content-id=2, pts=0:00:00.066666666, dur=0:00:00.033333334
+buffer: content-id=3, pts=0:00:00.100000000, dur=0:00:00.033333333
+buffer: content-id=4, pts=0:00:00.133333333, dur=0:00:00.033333333
+event eos: (no structure)
diff --git a/subprojects/gst-plugins-base/tests/validate/meson.build b/subprojects/gst-plugins-base/tests/validate/meson.build
index 6da821cc68..1385a85847 100644
--- a/subprojects/gst-plugins-base/tests/validate/meson.build
+++ b/subprojects/gst-plugins-base/tests/validate/meson.build
@@ -25,6 +25,8 @@ tests = [
     'giosrc/read-growing-file',
     'encodebin/set-encoder-properties',
     'uridecodebin/expose_raw_pad_caps',
+    'fakevideodec/encoded',
+    'fakevideodec/simple'
 ]
 
 env = environment()