QtMediaplayer Qt-5.12.4 loop play&stop avi media error

Yocto version: 4.14.78

Kernel version: 4.14.78

Qt version: 5.12.4

Gstreamer version: 1.14

Use the official release Qt-5.12.4 source code with this patch:

https://codereview.qt-project.org/c/qt/qtmultimedia/+/273602

Test application is: qmlvideo

Loop play & stop avi media, there are some errors:

1, Physical memory leak

[ 505.775362] cma: cma_alloc: alloc failed, req-size: 148 pages, ret: -12
[ 505.782035] mxc_vpu 2040000.vpu_fsl: Physical memory allocation error!
[ 505.790221] mxc_vpu 2040000.vpu_fsl: Physical memory allocation error!
[ 506.271940] cma: cma_alloc: alloc failed, req-size: 148 pages, ret: -12
[ 506.279280] mxc_vpu 2040000.vpu_fsl: Physical memory allocation error!
[ 506.286704] mxc_vpu 2040000.vpu_fsl: Physical memory allocation error!
[ 506.321782] cma: cma_alloc: alloc failed, req-size: 148 pages, ret: -12
[ 506.337159] mxc_vpu 2040000.vpu_fsl: Physical memory allocation error!
[ 506.344568] mxc_vpu 2040000.vpu_fsl: Physical memory allocation error!

2, some application's error

MediaPlayer error: 2 Cannot play stream of type: <unknown>
Warning: "No decoder available for type 'video/x-h264, parsed=(boolean)true, alignment=(string)au, stream-format=(string)byte-stream, width=(int)640, height=(int)480, framerate=(fraction)2182/91, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, profile=(string)constrained-baseline, level=(string)3'."

And, I have tested avi media with gstreamer pipeline, the shell script is:

#! /bin/bash
for ((i=0; i<9999999; ++i))
do
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
gst-launch-1.0 playbin uri=file:///vfat/media/1080P.avi
done

And there is no fault, no physical memory leak or gstreamer pipeline error.

Can anyone help this ?