Streaming Video and Bitmap Draw issues.

Question

Hello all,
In the current application I'm developing, I have a custom
video console. While watching a video, certain points in the
timeline will pop up a dialog box that gives the user the ability
to switch to a related video. If the user clicks the button to view
the related video, a 3D effect flips the current "main" console to
a secondary "branching" console - much like the flip effect the
iPhone uses. The videos are streaming from FMS 3, the client
application was developed in Flex, and we are using Alex Uhlmann's
Distortion Effects to achieve the 3D flip effect.
When I first started developing the application, I ran in to
the infamous "Security sandbox violation: BitmapData.draw" error
whenever I would try the flip. After some investigation on the web,
I found that I needed to set the Client.videoSampleAccess property
in my FMS application's main.asc to allow bitmap snapshot access. I
did so, and that seemed to do the trick. After playing with the
application a bit more, however, I found that the error would still
come about if I did the following:
1. Pause the video (stream)
2. Perform a seek while paused.
3. Attempt the flip effect.
When I did the above, the error came back. If I paused,
performed a seek, and then unpaused the video, everything worked
fine. If I pause and then immediately do the flip without a seek,
everything works fine.
It seems as though when you pause and then perform a seek,
the player forgets that it has permission to do a frame grab until
you restart playback.
Has anyone else had this issue, or anything similar? If so,
how did you solve it?
Thanks,
--G
(For reference, here is the actual Error that is getting
thrown)
SecurityError: Error #2123: Security sandbox violation:
BitmapData.draw:
http://localhost/Bison/trunk/BisonClient/bin/BisonClient-debug.swf
cannot access rtmp://localhost/digitaltutors. No policy files
granted access.
at flash.display::BitmapData/draw()
at
sandy.util::DistortImage/renderVector()[C:\workspaces\flex2.0.1\AlexFlexLibrary\sandy\uti l\DistortImage.as:190]
at
sandy.util::DistortImage/initialize()[C:\workspaces\flex2.0.1\AlexFlexLibrary\sandy\util\ DistortImage.as:107]
at
com.adobe.ac.mxeffects::SimpleDistortion/initDistortImage()[C:\workspaces\flex2.0.1\AlexF lexLibrary\com\adobe\ac\mxeffects\SimpleDistortion.as:501]
at
com.adobe.ac.mxeffects::SimpleDistortion/renderSides()[C:\workspaces\flex2.0.1\AlexFlexLi brary\com\adobe\ac\mxeffects\SimpleDistortion.as:357]
at
com.adobe.ac.mxeffects::SimpleDistortion/flipFront()[C:\workspaces\flex2.0.1\AlexFlexLibr ary\com\adobe\ac\mxeffects\SimpleDistortion.as:98]
at
com.adobe.ac.mxeffects.effectClasses::FlipInstance/updateFront()[C:\workspaces\flex2.0.1\ AlexFlexLibrary\com\adobe\ac\mxeffects\effectClasses\FlipInstance.as:46]
at mx.effects::Tween/
http://www.adobe.com/2006/flex/mx/internal::doInterval()[C:\dev\flex_201_gmc\sdk\framework s\mx\effects\Tween.as:567
at
mx.effects::Tween$/timerHandler()[C:\dev\flex_201_gmc\sdk\frameworks\mx\effects\Tween.as: 177]
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()

Answer 1

Hi,
I've been searching all over for someone having the same
problem that I am.
I'm seeing nearly the same thing that you are. I have
SWFVerification turned on and the swf copied over to the correct
directory. If I stream an FLV and attempt to capture grab the
bitmap data it works fine. Always.
If I try the same thing with a .mov or .mp4 file it mostly
works, but sometimes (after doing basically the same thing you've
described in your message), I get the SecurityError. If I try again
after a delay of a few seconds, sometimes it works. When that
doesn't work, if I seek a 1/10th of a second ahead in the video
then try again, it almost always works. But sometimes that, too,
fails.
Have you found a reliable solution to your problem? Has
anyone else seen this issue? I would file a bug for FMS, but it
looks like the bug-tracking system for FMS is not public. It would
be nice for it to be public.
regards,
david