Use mp4 as the source stream

Enable HW video decoder and use it to decode video_device.mp4. Currenlty
the end of stream (EOS) has error that causes problems for looping, so
disable looping for now.

Bug: 151393184
Tested: edgetpu_demo --device
Change-Id: I6695014476613d46fd78f3d3cc17edfdc13c75d9
diff --git a/edgetpu_demo b/edgetpu_demo
index e4e7036..bd37bed 100755
--- a/edgetpu_demo
+++ b/edgetpu_demo
@@ -1,8 +1,7 @@
 #!/bin/bash
 
 readonly TEST_DATA="/usr/share/edgetpudemo"
-#TODO: Use video_device.mp4 once vcodec is available.
-readonly VIDEO_DEVICE_FILE="/home/mendel/video_test_yuy2.yuv"
+readonly VIDEO_DEVICE_FILE="${TEST_DATA}/video_device.mp4"
 readonly VIDEO_STREAM_FILE="${TEST_DATA}/video_stream.mp4"
 readonly TPU_MODEL_FILE="${TEST_DATA}/mobilenet_ssd_v1_coco_quant_postprocess_edgetpu.tflite@Running MobileNet SSD v1 on Edge TPU"
 readonly CPU_MODEL_FILE="${TEST_DATA}/mobilenet_ssd_v1_coco_quant_postprocess.tflite@Running MobileNet SSD v1 on CPU"
@@ -12,6 +11,7 @@
   echo "Press 'q' to quit."
   echo "Press 'n' to switch between models."
 
+#TODO: Add looping back once codec EOS is fixed.
   edgetpu_detect \
       --source "${VIDEO_DEVICE_FILE}" \
       --model "${TPU_MODEL_FILE},${CPU_MODEL_FILE}" \
@@ -19,7 +19,6 @@
       --filter car,truck \
       --max_area 0.1 \
       --color white \
-      --loop \
       --displaymode window
 # Disable stream demo for now.
 # elif [[ "$1" == "--stream" ]]; then