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List:       mjpeg-developer
Subject:    Re: [Mjpeg-developer] mplex library segfault
From:       "Ronald S. Bultje" <rbultje () ronald ! bitfreak ! net>
Date:       2006-06-26 20:01:21
Message-ID: Pine.LNX.4.56.0606262156360.21404 () www ! ithos ! nl
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Hey,

On Sun, 25 Jun 2006, Mark Nauwelaerts wrote:
> When trying to use mplex as a library (in gstreamer 0.10 plugin), I ran into
> some segfaults.
[..]

I you're going to do something like this, you should understand mjpegtools
and gstreamer first. The problem is unaligned (ptr&16!=0) memory access in
the pointer as provided by GStreamer. The solution is to turn off
optimizations, copy data or write allocation functons for GStreamer to
provide 16-byte aligned pointers.

However, in the end, it won't get you anywhere. Mplex and mpeg2enc cannot
sync on non-linear timestamps, which is what GStreamer provides (in the
buf->time field). Therefore, the resulting file will practically always be
out of sync.

Ronald

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