[Libav-user] How to connect to an IP camera in libav

Don Moir donmoir at comcast.net
Mon Dec 10 19:29:48 CET 2012

> From: Alexander Wischnewski 
> To: This list is about using libavcodec, libavformat, libavutil,libavdevice and libavfilter. 
> Sent: Sunday, December 09, 2012 9:43 PM
> Subject: Re: [Libav-user] How to connect to an IP camera in libav
> Hello Don,
> is the avformat_open_input function taking long or maybe the avformat_find_stream_info ? 
> In the second case you have to reduce the maximal analyze duration of the AVFormatContext, you can do it like this:
>     pFormatCtx->max_analyze_duration = 1.0 * AV_TIME_BASE;
>     // Retrieve stream information
>     avformat_find_stream_info(pFormatCtx, NULL)
> Seems that the default value is set to a very high value to make sure there are all important informations gathered,
> 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.
> Best regards,
> Alex

Hi Alex,

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 :)

Also the framerate guessed by ffmpeg is always 25 fps in this case which is wrong so need to do something about that.

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.

I know it exist but mostly packaged up with a program. I would be willing to purchase such a thing. 

Would you happen to know where I could my hands on that ?'

I have the strings for my foscam but thats just one camera. I would need them for many.


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