diff --git a/subprojects/gst-libav/ext/libav/gstavaudenc.c b/subprojects/gst-libav/ext/libav/gstavaudenc.c
index 283d0f4397..d1bd7cb83b 100644
--- a/subprojects/gst-libav/ext/libav/gstavaudenc.c
+++ b/subprojects/gst-libav/ext/libav/gstavaudenc.c
@@ -382,7 +382,7 @@ static void
 gst_ffmpegaudenc_free_avpacket (gpointer pkt)
 {
   av_packet_unref ((AVPacket *) pkt);
-  g_slice_free (AVPacket, pkt);
+  g_free (pkt);
 }
 
 typedef struct
@@ -405,7 +405,7 @@ buffer_info_free (void *opaque, guint8 * data)
     av_freep (&info->ext_data);
     av_freep (&info->ext_data_array);
   }
-  g_slice_free (BufferInfo, info);
+  g_free (info);
 }
 
 static GstFlowReturn
@@ -425,7 +425,7 @@ gst_ffmpegaudenc_send_frame (GstFFMpegAudEnc * ffmpegaudenc, GstBuffer * buffer)
   ctx = ffmpegaudenc->context;
 
   if (buffer != NULL) {
-    BufferInfo *buffer_info = g_slice_new0 (BufferInfo);
+    BufferInfo *buffer_info = g_new0 (BufferInfo, 1);
     guint8 *audio_in;
     guint in_size;
 
@@ -579,7 +579,7 @@ gst_ffmpegaudenc_receive_packet (GstFFMpegAudEnc * ffmpegaudenc,
 
   ctx = ffmpegaudenc->context;
 
-  pkt = g_slice_new0 (AVPacket);
+  pkt = g_new0 (AVPacket, 1);
 
   res = avcodec_receive_packet (ctx, pkt);
 
@@ -619,7 +619,7 @@ gst_ffmpegaudenc_receive_packet (GstFFMpegAudEnc * ffmpegaudenc,
     *got_packet = TRUE;
   } else {
     GST_LOG_OBJECT (ffmpegaudenc, "no output produced");
-    g_slice_free (AVPacket, pkt);
+    g_free (pkt);
     ret = GST_FLOW_OK;
     *got_packet = FALSE;
   }
diff --git a/subprojects/gst-libav/ext/libav/gstavviddec.c b/subprojects/gst-libav/ext/libav/gstavviddec.c
index 43cea456ae..85e34a0c35 100644
--- a/subprojects/gst-libav/ext/libav/gstavviddec.c
+++ b/subprojects/gst-libav/ext/libav/gstavviddec.c
@@ -723,7 +723,7 @@ gst_ffmpegviddec_video_frame_new (GstFFMpegVidDec * ffmpegdec,
 {
   GstFFMpegVidDecVideoFrame *dframe;
 
-  dframe = g_slice_new0 (GstFFMpegVidDecVideoFrame);
+  dframe = g_new0 (GstFFMpegVidDecVideoFrame, 1);
   dframe->ffmpegdec = ffmpegdec;
   dframe->frame = frame;
 
@@ -747,7 +747,7 @@ gst_ffmpegviddec_video_frame_free (GstFFMpegVidDec * ffmpegdec,
   if (frame->avbuffer) {
     av_buffer_unref (&frame->avbuffer);
   }
-  g_slice_free (GstFFMpegVidDecVideoFrame, frame);
+  g_free (frame);
 }
 
 static void
diff --git a/subprojects/gst-libav/ext/libav/gstavvidenc.c b/subprojects/gst-libav/ext/libav/gstavvidenc.c
index 4689959066..fef5cae904 100644
--- a/subprojects/gst-libav/ext/libav/gstavvidenc.c
+++ b/subprojects/gst-libav/ext/libav/gstavvidenc.c
@@ -484,7 +484,7 @@ static void
 gst_ffmpegvidenc_free_avpacket (gpointer pkt)
 {
   av_packet_unref ((AVPacket *) pkt);
-  g_slice_free (AVPacket, pkt);
+  g_free (pkt);
 }
 
 typedef struct
@@ -500,7 +500,7 @@ buffer_info_free (void *opaque, guint8 * data)
 
   gst_video_frame_unmap (&info->vframe);
   gst_buffer_unref (info->buffer);
-  g_slice_free (BufferInfo, info);
+  g_free (info);
 }
 
 static enum AVStereo3DType
@@ -591,14 +591,14 @@ gst_ffmpegvidenc_send_frame (GstFFMpegVidEnc * ffmpegenc,
   if (GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME (frame))
     picture->pict_type = AV_PICTURE_TYPE_I;
 
-  buffer_info = g_slice_new0 (BufferInfo);
+  buffer_info = g_new0 (BufferInfo, 1);
   buffer_info->buffer = gst_buffer_ref (frame->input_buffer);
 
   if (!gst_video_frame_map (&buffer_info->vframe, info, frame->input_buffer,
           GST_MAP_READ)) {
     GST_ERROR_OBJECT (ffmpegenc, "Failed to map input buffer");
     gst_buffer_unref (buffer_info->buffer);
-    g_slice_free (BufferInfo, buffer_info);
+    g_free (buffer_info);
     gst_video_codec_frame_unref (frame);
     goto done;
   }
@@ -677,15 +677,15 @@ gst_ffmpegvidenc_receive_packet (GstFFMpegVidEnc * ffmpegenc,
 
   *got_packet = FALSE;
 
-  pkt = g_slice_new0 (AVPacket);
+  pkt = g_new0 (AVPacket, 1);
 
   res = avcodec_receive_packet (ffmpegenc->context, pkt);
 
   if (res == AVERROR (EAGAIN)) {
-    g_slice_free (AVPacket, pkt);
+    g_free (pkt);
     goto done;
   } else if (res == AVERROR_EOF) {
-    g_slice_free (AVPacket, pkt);
+    g_free (pkt);
     ret = GST_FLOW_EOS;
     goto done;
   } else if (res < 0) {