Hi,

While testing our app, we've encountered crash on running pipeline with vtenc, when going to background.

Note: App has Background capabilities enabled.

Pausing a possible way to overcome this, but not a solution for us, since we perform live streaming.

Pipeline:
avfvideosrc ! video/x-raw,format=NV12,width=960,height=540,framerate=30/1 ! tee name=tp tp. ! queue ! autovideosink tp. ! queue ! videoconvert ! vtenc_h264 bitrate=2500 max-keyframe-interval-duration=2000000000 max-keyframe-interval=60 allow-frame-reordering=false realtime=true quality=0.5 ! h264parse ! video/x-h264,framerate=30/1,width=960,height=540,stream-format=(string)avc,level=(string)3.1,profile=(string)main ! queue ! mux. autoaudiosrc ! audioconvert ! voaacenc bitrate=64000 ! aacparse ! queue max-size-buffers=0 max-size-time=0 max-size-bytes=0 ! flvmux streamable=true name=mux ! queue max-size-buffers=0 max-size-time=0 max-size-bytes=0 ! rtmpsink location='rtmp://...... live=1'

Here's stack trace:
0CoreFoundation0x22e9bd3c CFNumberGetValue + 76
1Trace0x002994f8 gst_vtenc_handle_frame (vtenc.c:1011)
2Trace0x00d03ce0 gst_video_encoder_chain (gstvideoencoder.c:1452)
3Trace0x00c87298 gst_pad_chain_data_unchecked (gstpad.c:3830)
4Trace0x00c87930 gst_pad_push_data (gstpad.c:4063)
5Trace0x00c17058 gst_base_transform_chain (gstbasetransform.c:2260)
6Trace0x00c87298 gst_pad_chain_data_unchecked (gstpad.c:3830)
7Trace0x00c87930 gst_pad_push_data (gstpad.c:4063)
8Trace0x0031f750 gst_queue_loop (gstqueue.c:1169)
9Trace0x00c99838 gst_task_func (gsttask.c:316)
10Trace0x00b23e90 g_thread_pool_thread_proxy (gthreadpool.c:307)
11Trace0x00b26d78 g_thread_proxy (gthread.c:764)