c:\gstreamer\1.0\x86\bin\gst-launch-1.0.exe videotestsrc num-buffers=1 ! video/x-raw,format=I420,width=1280,height=720 ! autovideoconvert ! avenc_bmp ! filesink location="/path/Snapshot.bmp"

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:31.674: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:31.776: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:31.875: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:31.976: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.077: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.177: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.278: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.379: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.480: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.580: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.681: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.783: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.884: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:32.984: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:33.085: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:33.186: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:33.286: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:33.387: _gst_util_uint64_scale_int: assertion 'denom > 0' failed

(gst-launch-1.0:10832): GStreamer-CRITICAL **: 09:16:33.488: _gst_util_uint64_scale_int: assertion 'denom > 0' failed
Got context from element 'msdkvpp0': gst.msdk.Context=context, gst.msdk.Context=(GstMsdkContext)"\(GstMsdkContext\)\ msdkcontext0";
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock0,0 %)
Got EOS from element "pipeline0".
Execution ended after 0:00:00.019830000
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

The number of "_gst_util_uint64_scale_int: assertion 'denom > 0' failed" varies. When there are many, the attempt seem to fail.