[Libav-user] How to change RTSP/UDP max buffer size?

Sergio Basurco sergio.b at coherentsynchro.com
Mon Mar 16 09:20:04 CET 2015

So I found that I can set parameters through the AVDictionary, however I 
don't know which entry to use in order to modify the udp buffer size.

Anyone knows if this is how to set this parameter?

El 13-Mar-15 a las 2:12 PM, Sergio Basurco escribió:
> Hi there,
> Related questions:
> 1 - http://ffmpeg.org/pipermail/libav-user/2012-June/002324.html
> 2 - https://lists.libav.org/pipermail/libav-api/2012-February/000409.html
> I'm using very high resolution cameras via rtsp. Initially I had several
> broken frames and an unstable connection. I ended up finding out that
> this is due the UDP max buffer size.
> By changing libavformat/udp.c and setting UDP_MAX_PKT_SIZE to be a lot
> bigger. This did solve the issue completely and everything works just fine.
> However I know there must be some way to do this via the API. In the
> link #2 above I read:
>  > No, you're correct. The correct solution is to create a private option
>  > for the udp protocol, and proxy that option with a rtsp/rtp private
>  > option. Then the ?x=y can disappear. Anton, am I correct here?
> And I'm not sure what that means. There must be some way to access these
> parameters once I get my AVCodecCtx after opening the stream. Any idea how?
> Thanks!

Sergio Basurco,
Coherent Synchro

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