[Spice-devel] [PATCH v9 00/24] Add GStreamer support for video streaming

[Pavel Grunt]

Hi,

sorry for the late reply.

On Mon, 2016-01-25 at 20:45 +0100, Francois Gouget wrote:
> On Thu, 21 Jan 2016, Pavel Grunt wrote:
> [...]
> > > I have never tested it with the replay functionality so I don't
> > > know of 
> > > any compatibility issue. So in theory access to the replay log
> > > would let 
> > > me reproduce the crash?
> > 
> > It should, the recording:
> > http://people.freedesktop.org/~pgrunt/win7record.spice.xz
> > 
> > And I use it with the replay utility:
> > xzcat win7record.spice.xz | ./spice-server-replay -c "spicy -h
> > localhost -p 5000" - -S 2 -v "gstreamer:mjpeg"
> 
> Initially it looked like I could reproduce this problem but in fact
> I'm 
> getting an error before the video gets encoded:
> 
> Spice-Warning **: red-parse-qxl.c:493:red_get_image: guest error:
> zero area bitmap
> 
> 
> And indeed when I look at what qxl points to:
> 
> (gdb) p *((QXLImage *)0xa5986d0)
> $1 = {descriptor = {id = 0, type = 0 '\000', flags = 0 '\000', width
> = 0, height = 0}, {
>     bitmap = {format = 0 '\000', flags = 0 '\000', x = 0, y = 0,
> stride = 0, 
>       palette = 173639440, data = 0}, quic = {data_size = 0, data =
> 0xa5986e6 ""}, 
>     surface_image = {surface_id = 0}}}
> 
> 
> This happens even without any of my patches obviously.
> Do you know why I would be getting this?
> 
It is a guest error, zero size image, it should not be causing server
crashes. I can provide a recording without the warning:
http://people.freedesktop.org/~pgrunt/rhel6_gstreamer_record.spice.xz

It seems that gstreamer has problem when the stream dimensions changes.
I notice that before the server hangs the target-bitrate is set to:
0 for gstreamer:vp8 or mjpeg http://fpaste.org/315639/14539702/ and
1 for gstreamer:h264 http://fpaste.org/315644/53971267/

Regards,
Pavel