Re: [Vnc2swf-users] Res: Res: AssertionError limits recording time

[Oscar U. <osc...@pr...>]

 Folks,

Is there a way for us to update the documentation with this and other
important information? Also I would like to add source code updates to
improve the software, but AFAIK there is no way presently to do this.

Thanks,
OSC

  ----- Original Message -----
  From: lfk...@ya...
  To: "General discussion about vnc2swf"
  Subject: [Vnc2swf-users] Res: Res: AssertionError limits recording
  time
  Date: Wed, 27 Aug 2008 05:59:30 -0700 (PDT)

  Hi.

  Just for information:
  -t shape -> creates rectangular objects similar to updates sent by
  vnc server. Object limit can be a problem. By default mouse pointer
  movements doesn't create new objects but just moves it. Creates a swf
  file.
  -t video ->  creates a video stream inside a swf file. Doesn't use
  rectangular objects. Uses a screen record/playback codec which
  basically splits the screen in small areas and writes the updates for
  each area on every frame. Object limit is not a problem since it
  doesn't create objects. Mouse pointer movements are treated as
  regular screen updates. Creates a swf file.
  -t flv -> creates a video stream in a flv file. Same as -t video
  except that the container is FLV.  Sound hasn't been implemented in
  pvnc2swf for this.

  Vnc2swf tries to remove updates that get totally covered by other
  updates between frames (updated rectangle ends up totally behind
  other rectangles). This is just a basic optimization.
  Maybe there could be implemented a better optimization that tries to
  reduce the number of objects created but this could be complex.

  Regards,

  Luis Fernando


  ----- Mensagem original ----
  De: Nitin Chandrachoodan <ni...@ee...>
  Para: General discussion about vnc2swf
  <vnc...@li...>
  Enviadas: Domingo, 24 de Agosto de 2008 1:55:09
  Assunto: Re: [Vnc2swf-users] Res: AssertionError limits recording
  time

  Thanks for the informative replies. As pointed out by you, I think
  the
  problem was that writing using a tablet creates too many small
  objects, causing the limit to be exceeded independent of the frames.

  I then tried recording to .vnc format and then converting to .swf
  with
  vnc2swf-edit, and when I use the -V option (video) it seems to work
  well. I had not realized that the -t video would still result in
  .swf,
  I thought it meant it would create .flv. I assume this means that
  directly recording to .swf with -t video will give the same effect -
  namely size limited by number of frames, not objects?

  Thanks very much,

  Nitin




  On Thu, Aug 21, 2008 at 7:35 PM,  <lfk...@ya...> wrote:
  > Hi,
  >
  > VNC protocol uses rectangles to send screen updates to the client.
  > When you record or transform into shape format (not video), vnc2swf
  creates
  > a swf object for each rectangle.  Usually there are many rectangles
  in each
  > screen update when the screen changes often but there may be none
  when the
  > screen is not updated.
  > One thing many people don't realize is that any icon or label that
  changes
  > very often (such as network connection icon or even the clock with
  seconds
  > or even msn) and is not related to the recording may be increasing
  the size
  > of the recording and the number of objects created.
  > So anything that changes on screen causes a rectangle update.  The
  size of
  > the rectangle depends on the area changed. It the small areas far
  apart
  > change, there will be two rectangle updates.  If they are close,
  there may
  > be just one.
  > I suggest removing icons that are not necessary while recording.
  > What I want to say is that frame count is not the only limiting
  factor.
  > I think that object count is even more important and it is probably
  what's
  > been limiting the recordings.
  > You could try converting to video format, or even to flv (audio not
  > supported yet).
  > They won't have the object count limit (I think).
  > Good luck!
  >
  > Luis Fernando
  >
  >
  > ----- Mensagem original ----
  > De: Nitin Chandrachoodan <ni...@ee...>
  > Para: vnc...@li...
  > Enviadas: Quinta-feira, 21 de Agosto de 2008 1:19:54
  > Assunto: [Vnc2swf-users] AssertionError limits recording time
  >
  > Hello,
  >
  > I am using pyvnc2swf 0.9.2 (from Debian testing) to record lectures
  in
  > class (I write on a tablet using Xournal in VNC and record the VNC
  > session along with audio using the -S option).
  >
  > After about 30-45 minutes, the program crashes with an error
  >
  >  File "/usr/share/pyvnc2swf/swf.py", line 784, in newid
  >  assert self.objid < 65536, 'the number of objects exceeded the
  limit!'
  > AssertionError: the number of objects exceeded the limit!
  >
  > I tried reducing the framerate as suggested in other messages, but
  > even with a framerate of 3 it still crashed before the end of the
  > lecture (<50 minutes).
  >
  > I then tried recording to .vnc format, and it records the whole
  > lecture, but if I try converting to swf with vnc2swf-edit.py, it
  again
  > crashes with the same AssertionError.
  >
  > One of the previous messages mentioned a maximum of 16000 frames,
  > which should still give > 5000s at 3fps. Is the above error to do
  with
  > frames, or are the VNC changes recorded as objects, which would
  maybe
  > make it crash if I wrote too much in one session?
  >
  > Thanks,
  >
  > Nitin

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