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handle case where video is so black we fail to get a thumbnail

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This commit is contained in:
Damien De Paoli
2021-09-24 20:05:49 +10:00
parent a44810a2f4
commit 012c2809f1
2 changed files with 11 additions and 3 deletions
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2
TODO
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@@ -35,8 +35,6 @@
* support animated gifs in html5 canvas * support animated gifs in html5 canvas
* if a video is really mostly black, then we dont get a thumbnail... (see: 20210526_205257_01.mp4)
## DB ## DB
* Dir can have date in the DB, so we can do Oldest/Newest dirs in Folder view * Dir can have date in the DB, so we can do Oldest/Newest dirs in Folder view

12
pa_job_manager.py
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@@ -1418,9 +1418,19 @@ def GenVideoThumbnail(job, file):
try: try:
vcap = cv2.VideoCapture(file) vcap = cv2.VideoCapture(file)
res, frame = vcap.read() res, frame = vcap.read()
first_res = res
first_frame = frame
frame_cnt=0
# if the mean pixel value is > 15, we have something worth making a sshot of (no black frame at start being the sshot) # if the mean pixel value is > 15, we have something worth making a sshot of (no black frame at start being the sshot)
while frame.mean() < 15 and res: # limit it to 1000 frames jic
while res and frame.mean() < 15 and frame_cnt < 1000:
res, frame = vcap.read() res, frame = vcap.read()
frame_cnt += 1
# if we never got a frame that is not dark, then use first frame
if not res:
res = first_res
frame = first_frame
w = vcap.get(cv2.cv2.CAP_PROP_FRAME_WIDTH) w = vcap.get(cv2.cv2.CAP_PROP_FRAME_WIDTH)
h = vcap.get(cv2.cv2.CAP_PROP_FRAME_HEIGHT) h = vcap.get(cv2.cv2.CAP_PROP_FRAME_HEIGHT)
if w > h: if w > h: