[Live-devel] streaming live H263 video

[Arkady Erlikhman]

I can't change the size of the named pipe buffer since my app runs on iPhone
iOS.

Changing BANK_SIZE makes no difference - VLC player starts playing the
stream, then pauses for 3-5 seconds, then plays again and the pattern
continuous.

What else would you recommend?

Thanks.

On Sun, Mar 6, 2011 at 4:52 PM, Ross Finlayson <finlayson at live555.com>wrote:

>  I am trying to make Live555 work with live video source. My H263 encoder
> writes encoded frames to Unix named pipe (FIFO) with a rate of 15 fps*.* I
> created a RTSPServer instance, ServerMediaSession and added
> a H263plusVideoFileServerMediaSubsession (reuseFirstSource=True), passing
> the FIFO file name as the subsession parameter.
>
>
> VLC and/or QuickTime player start playing the stream, then repeatedly
> freeze for several seconds, then play again. However, everything works fine
> if I stream pre-recoded H.263 encoded elementary stream from file (without
> using named pipe). Is this happening when RTSPServer is getting EOF while
> trying to read the data from the pipe?
>
>
> No, it's most likely because the server is trying to read more data from
> the pipe than is currently available, so the operating system is blocking
> the reading server until the other end (the encoder) makes enough data
> available.
>
> One way to fix this is to - if you can - increase the internal (i.e., OS)
> buffering in your named pipe.  Our server tries to read up to 150000 bytes
> at a time (the constant BANK_SIZE in "StreamParser.cpp"), so you should try
> to make the pipe's buffer at least this large.
>
> Alternatively - if you can't increase the amount of buffering in your pipe
> - you could try reducing the value of the constant BANK_SIZE in
> "StreamParser.cpp".  You should not make this too small, though; it needs to
> be at least as large as the largest possible H.263 frame that you expect to
> see.
> I don't recommend doing this except as a last resort, though, because it
> requires modifying the supplied source code.
>
> --
>
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
>
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live555.com
> http://lists.live555.com/mailman/listinfo/live-devel
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.live555.com/pipermail/live-devel/attachments/20110313/c48efd56/attachment.html>