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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
Autres articles (64)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir -
Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users.
Sur d’autres sites (9005)
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RTP Timestamps Are Not Monotonically increasing
25 août 2019, par Fr0styI am finding it a bit difficult trying to understand whether or not the hack around with FFmpeg and OpenCV really provided a RTP timestamp. My last post helped a little bit but got me stuck in trying to validate the timestamps obtained through this work around by modifying ffmpeg and opencv.
FFmpeg version : 4.1.0
OpenCV version : 3.4.1import cv2
import time
from datetime import datetime, date
uri = 'rtsp://admin:password@192.168.1.66:554/Streaming/Channels/101'
cap = cv2.VideoCapture(uri)
'''One is the offset between the two epochs. Unix uses an epoch located at 1/1/1970-00:00h (UTC) and NTP uses 1/1/1900-00:00h.
This leads to an offset equivalent to 70 years in seconds (there are 17 leap years between the two dates so the offset is'''
time_offset = 2208988800 # (70*365 + 17)*86400 = 2208988800 (in seconds)
# offset = 3775484294
days = 43697
pdat = "1900-01-01 00:00:00:00"
mdat = "2019-08-23 22:02:44:00" # str(datetime.now()) + str(datetime.now().time())
pdate = datetime.strptime(pdat, "%Y-%m-%d %H:%M:%S:%f").date()
mdate = datetime.strptime(mdat, "%Y-%m-%d %H:%M:%S:%f").date()
delta = (mdate - pdate).days
offset = delta * 86400
def time_delta(s):
return (s - time_offset)
while True:
frame_exists, curr_frame = cap.read()
if frame_exists:
seconds = cap.getRTPTimeStampSeconds()
fraction = cap.getRTPTimeStampFraction()
timestamp = cap.getRTPTimeStampTs()
unix_offset = seconds - time_offset
msec = int((int(fraction) / 0xFFFFFFFF) * 1000.0)
ts = float(str(unix_offset) + "." + str(msec))
# print("Timestamp per Frame:%i" % timestamp)
print((datetime.fromtimestamp(float(ts) + offset)))
cap.release()My Output :
On August 23, 2019 at 22:02
...
2019-08-23 13:59:52.781000
2019-08-23 13:59:52.726000
2019-08-23 13:59:52.671000
2019-08-23 13:59:52.616000
2019-08-23 13:59:52.561000
2019-08-23 13:59:52.506000
2019-08-23 13:59:52.451000
2019-08-23 13:59:52.396000
2019-08-23 13:59:52.342000
2019-08-23 13:59:52.287000
2019-08-23 13:59:52.232000
2019-08-23 13:59:52.177000
2019-08-23 13:59:52.122000
2019-08-23 13:59:52.067000
2019-08-23 13:59:52.012000
2019-08-23 13:59:53.570000
2019-08-23 13:59:53.020000
2019-08-23 13:59:53.847000
2019-08-23 13:59:53.792000I’ve noticed how the time increments weirdly (that’s not suppose to happen in the real, current time), such as the last two lines and a few others in between in the output. A bit flabbergasted as to what went wrong. Also trying this out on multiple IP cameras, with each showing a different timestamp probably related to when they were turned on.
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Having trouble obtaining the time from RTP Timestamps obtained through OpenCV
24 août 2019, par Fr0styI am finding it a bit difficult trying to understand whether or not the hack around with FFmpeg and OpenCV really provided a RTP timestamp. My last post helped a little bit but got me stuck in trying to validate the timestamps obtained through this work around by modifying ffmpeg and opencv.
FFmpeg version : 4.1.0
OpenCV version : 3.4.1import cv2
import time
from datetime import datetime, date
uri = 'rtsp://admin:password@192.168.1.66:554/Streaming/Channels/101'
cap = cv2.VideoCapture(uri)
'''One is the offset between the two epochs. Unix uses an epoch located at 1/1/1970-00:00h (UTC) and NTP uses 1/1/1900-00:00h.
This leads to an offset equivalent to 70 years in seconds (there are 17 leap years between the two dates so the offset is'''
time_offset = 2208988800 # (70*365 + 17)*86400 = 2208988800 (in seconds)
# offset = 3775484294
days = 43697
pdat = "1900-01-01 00:00:00:00"
mdat = "2019-08-23 22:02:44:00" # str(datetime.now()) + str(datetime.now().time())
pdate = datetime.strptime(pdat, "%Y-%m-%d %H:%M:%S:%f").date()
mdate = datetime.strptime(mdat, "%Y-%m-%d %H:%M:%S:%f").date()
delta = (mdate - pdate).days
offset = delta * 86400
def time_delta(s):
return (s - time_offset)
while True:
frame_exists, curr_frame = cap.read()
if frame_exists:
seconds = cap.getRTPTimeStampSeconds()
fraction = cap.getRTPTimeStampFraction()
timestamp = cap.getRTPTimeStampTs()
unix_offset = seconds - time_offset
msec = int((int(fraction) / 0xFFFFFFFF) * 1000.0)
ts = float(str(unix_offset) + "." + str(msec))
# print("Timestamp per Frame:%i" % timestamp)
print((datetime.fromtimestamp(float(ts) + offset)))
cap.release()My Output :
On August 23, 2019 at 22:02
...
2019-08-23 13:59:52.781000
2019-08-23 13:59:52.726000
2019-08-23 13:59:52.671000
2019-08-23 13:59:52.616000
2019-08-23 13:59:52.561000
2019-08-23 13:59:52.506000
2019-08-23 13:59:52.451000
2019-08-23 13:59:52.396000
2019-08-23 13:59:52.342000
2019-08-23 13:59:52.287000
2019-08-23 13:59:52.232000
2019-08-23 13:59:52.177000
2019-08-23 13:59:52.122000
2019-08-23 13:59:52.067000
2019-08-23 13:59:52.012000
2019-08-23 13:59:53.570000
2019-08-23 13:59:53.020000
2019-08-23 13:59:53.847000
2019-08-23 13:59:53.792000I’ve noticed how the time increments weirdly (that’s not suppose to happen in the real, current time), such as the last two lines and a few others in between in the output. A bit flabbergasted as to what went wrong. Also trying this out on multiple IP cameras, with each showing a different timestamp probably related to when they were turned on.
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7 Fintech Marketing Strategies to Maximise Profits in 2024
24 juillet 2024, par Erin