Problem with tutotrial 7 on ububuntu 16.04

[Alex Lavriv]

Hello, I have compiled succesfuly the 7th tutorial, but when I am trying to
run it, nothing happens, and  there are errors in the terminal :

alex at alex-PORTEGE-Z30-A:~/phantomInternship/gstHell/gst-docs/examples/tutorials$
./basic-tutorial-7
Obtained request pad src_0 for audio branch.
Obtained request pad src_1 for video branch.
libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0

** (basic-tutorial-7:21268): CRITICAL **:
gst_video_calculate_display_ratio: assertion 'num > 0' failed

** (basic-tutorial-7:21268): CRITICAL **: gst_vaapi_window_new_internal:
assertion 'width > 0' failed

** (basic-tutorial-7:21268): CRITICAL **:
gst_video_calculate_display_ratio: assertion 'num > 0' failed

** (basic-tutorial-7:21268): CRITICAL **: gst_vaapi_window_new_internal:
assertion 'width > 0' failed

** (basic-tutorial-7:21268): CRITICAL **:
gst_video_calculate_display_ratio: assertion 'num > 0' failed

** (basic-tutorial-7:21268): CRITICAL **: gst_vaapi_window_new_internal:
assertion 'width > 0' failed

** (basic-tutorial-7:21268): CRITICAL **:
gst_video_calculate_display_ratio: assertion 'num > 0' failed

** (basic-tutorial-7:21268): CRITICAL **: gst_vaapi_window_new_internal:
assertion 'width > 0' failed

** (basic-tutorial-7:21268): CRITICAL **:
gst_video_calculate_display_ratio: assertion 'num > 0' failed

** (basic-tutorial-7:21268): CRITICAL **: gst_vaapi_window_new_internal:
assertion 'width > 0' failed

** (basic-tutorial-7:21268): CRITICAL **:
gst_video_calculate_display_ratio: assertion 'num > 0' failed

** (basic-tutorial-7:21268): CRITICAL **: gst_vaapi_window_new_internal:
assertion 'width > 0' failed
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