GES is not rotating a *.mov file which is tagged for rotation

[David Ing]

I have an old *.mov file ...

https://drive.google.com/file/d/1qNm2ISC5qnI3VN0MwemCcb_QjweJAjYF/view?usp=sharing

... which is tagged in a way that indicates it should be rotated when it is
displayed.  Below (at end of this message) is an excerpt from an ffprobe
command which demonstrates the how the file is tagged (I highlighted the
relevant output).

I am using the file as a GESUriClip inside of a GESTimeline, and the
rotation is not being applied.  It comes through upside-down.

*My question is*:  Is this a bug?  Or am I expected to detect the tags
manually and then modify the "video-direction" property of GESVideoSource
myself?

---------------------------------
$ *ffprobe -v quiet -show_streams rotate-180.mov*
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_time_base=2191/105200
codec_tag_string=avc1
codec_tag=0x31637661
width=1920
height=1080
coded_width=1920
coded_height=1088
has_b_frames=0
sample_aspect_ratio=N/A
display_aspect_ratio=N/A
pix_fmt=yuv420p
level=41
color_range=tv
color_space=bt709
color_transfer=bt709
color_primaries=bt709
chroma_location=left
field_order=unknown
timecode=N/A
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=24/1
avg_frame_rate=52600/2191
time_base=1/600
start_pts=0
start_time=0.000000
duration_ts=6573
duration=10.955000
bit_rate=17150952
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=263
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:rotate=180
TAG:creation_time=2016-03-14T08:26:08.000000Z
TAG:language=und
TAG:handler_name=Core Media Video
TAG:encoder=H.264
[SIDE_DATA]
side_data_type=Display Matrix
displaymatrix=
00000000:       -65536           0           0
00000001:            0      -65536           0
00000002:    125829120    70778880  1073741824

rotation=-180
[/SIDE_DATA]
[/STREAM]
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