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<DIV><FONT face=Arial size=2>> From: Alexander Wischnewski <BR>> To: This
list is about using libavcodec, libavformat, libavutil,libavdevice and
libavfilter. <BR>> Sent: Sunday, December 09, 2012 9:43 PM<BR>> Subject:
Re: [Libav-user] How to connect to an IP camera in libav</FONT></DIV>
<DIV><FONT face=Arial size=2>> <BR>> Hello Don,</DIV>
<DIV>> </DIV>
<DIV>> is the avformat_open_input function taking long or maybe the
avformat_find_stream_info ? </DIV>
<DIV>> </DIV>
<DIV>> In the second case you have to reduce the maximal analyze duration of
the AVFormatContext, you can do it like this:</DIV>
<DIV>> </DIV>
<DIV>> pFormatCtx->max_analyze_duration = 1.0 *
AV_TIME_BASE;</DIV>
<DIV>> </DIV>
<DIV>> // Retrieve stream
information<BR>>
avformat_find_stream_info(pFormatCtx, NULL)</DIV>
<DIV>> <BR>> Seems that the default value is set to a very high value to
make sure there are all important informations gathered,</DIV>
<DIV>> but this is not necessary for a simple mjpeg stream. I even use
this setting for decoding h264 streams and had no problems so far.</DIV>
<DIV>> </DIV>
<DIV>> Best regards,<BR>> Alex</DIV>
<DIV> </DIV>
<DIV>Hi Alex,</DIV>
<DIV> </DIV>
<DIV>That helps but doesn't completely resolve it. Even if I ignore timing
completely it's about 1/4 second off. The software that came with it is right
on. Arrgh more work :)</DIV>
<DIV> </DIV>
<DIV>Also the framerate guessed by ffmpeg is always 25 fps in this case which is
wrong so need to do something about that.</DIV>
<DIV> </DIV>
<DIV>I would be interested in a database of strings to control a variety of
IP cameras. Note that I just care about the various strings for acquisition and
controlling pan/tilt/zoom for various IP cameras and not interested in
controlling software so much.</DIV>
<DIV> </DIV>
<DIV>I know it exist but mostly packaged up with a program. I would be willing
to purchase such a thing. </DIV>
<DIV> </DIV>
<DIV>Would you happen to know where I could my hands on that ?'</DIV>
<DIV> </DIV>
<DIV>I have the strings for my foscam but thats just one camera. I would need
them for many.</DIV>
<DIV> </DIV>
<DIV>Thanks,</DIV>
<DIV> </DIV>
<DIV>Don</FONT></DIV></BODY></HTML>