Re: [Openvip-users] Help

[V.C.Mohan <mo...@ho...>]

I have included my findings below
regards
mohan
----- Original Message -----
From: "Antonín Slavík" <ton...@po...>
To: <ope...@li...>
Sent: Friday, August 06, 2004 5:22 PM
Subject: Re: [Openvip-users] Help


> It looks like there is a bug in
> src/core/video_transition_proxy.cpp module. To be sure, could you
> check the numbers of frames that the core asks your plugin for?
> Are they 0-719 or some other, too?
        I do not know how to do it. I checked for n==0 and n==m_length. It
didnt work. I inserted a printf statement  to print every frame number
requested in my transition right at the begining of process, but could not
see any output on screen, eventhough the transition is working. Pl advise
where I can put a "message display" if such a thing exists. There must be
someway of communicating in case of errors in parameters input. I find that
the param check done at set params  stage do not have access to frame and
clip info so that some params which have limits depending on frame width,
height or length of clip, I am unable to report such errors. Presently I am
checking them and if outside then forcing them to be within acceptable
limits.
>
> I'm also surprised with the message
> "unable to read frame 720. Giving an empty frame". I think it
> didn't come from OpenVIP but rather from Video for Windows
> library. What happens if you use just ffmpeg (try to delete
> in_vfwavi.dll)?

     in_vfwavi.dll , when deleted I could not read the input file. It did
not recognise input file as a media file.
>
> What does the sentence "I use same file as
>  inputs but offsetted" mean? Do you try to make transition
> between two clips corresponding to the same video file? If yes,
> does it help to make a copy of the input file so that the two
> clips correspond to two different files?

    I have only one avi file. I using the GUI, Insert  file in Edit panel,
first time place at the begining of time line on top video file, then again
insert file (the same file but at a later time on the lower video slot).
Then insert transition in the overlap area. View  by preview panel. I will
try having a copy of video file.
> Regards,
>
> Antonin Slavik
>
>
> > I have tried the preview with my
> > transitions as well as crossfade and
> > sweep.
> > with all transitions I get the message
> > "unable to read frame 720. Giving an
> > empty frame'. however with some of my
> > transitions the processing continues.
> > With others the application closes. The
> > debug info  for crossfade
> > 'unhandled exception access violation.
> > pythonw.exe(python22.dll) . Incase of
> > sweep once I got error and closing message
> > but a second attempt only
> > produced unable to read frame 720,
> > returning a empty frame. For some of my
> > dlls I get div by zero as the unhandled
> > exception. context shows
> > (mytransition.dll, but code displayed is in
> > assembler ). By inserting a line
> > of code in my transition at the start
> > "if(n>=m_length) return b; I could not
> > get rid of the error. At frame 720 there
> > should be no call to the transition
> > dll. My input consists of 720 frames avi
> > type 2 file. I use same file as
> > inputs but offsetted.
> > I have tried rendering also. The result is
> > same error.
> >
> > I am using python23 and have
> > wxpythonwin32-2.5.1.5-PY23-exe
> > vdub does not show any error in my input.
> > Also if I just process with
> > openvip this input by any filter and
> > preview I do not get any error.
> > regards
> > Mohan
>
>
>
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