OpenMovie()/CloseMovie() memory leak?
Blitz3D Forums/Blitz3D Programming/OpenMovie()/CloseMovie() memory leak?
| ||
| I've just cracked playing a movie onto a textured cube (based on someone else's code of course) but I've noticed that AvailVidMem() returns a progressively lower figure each time the movie is restarted (in order to loop). I thought CloseMovie(), then OpenMovie() would cure this but it didn't. Check out the example with your own avi or mpg (gifs work fine with no memory loss). I can't see any way around this since there is no movie equivalent of FreeEntity() . The danger is that if a movie is left to run (say, simulating a TV screen) then eventually the user's system will lock up.
Graphics3D 800,600,32,2
SetBuffer BackBuffer()
font=LoadFont("arial",20) : SetFont font
camera=CreateCamera() : light=CreateLight()
cube = CreateCube() : MoveEntity cube,0,0,3 : ScaleEntity cube,1,0.5,1
movietex = CreateTexture(256,128) : EntityTexture cube,movietex
movie$ = "sample.avi" : hmovie = OpenMovie(movie$) ; any AVI or MPG
framePeriod = 1000/30 : frametimer = CreateTimer(framePeriod)
While Not KeyHit(1)
WaitTimer frametimer
If t>5
t=0
If Not MoviePlaying(hmovie)
CloseMovie(hmovie)
hmovie = OpenMovie(movie$)
frame = 0
Else
SetBuffer TextureBuffer(movietex)
DrawMovie(hmovie)
frame = frame + 1 : Color 255,255,255 : Text 0,0,"Frame "+frame
SetBuffer BackBuffer()
EndIf
EndIf
t=t+1
TurnEntity cube,0,.4,0
UpdateWorld() : RenderWorld()
Text 0,0,"AvailVidMem() "+AvailVidMem()
Flip()
Wend
End
|
| ||
| doubt this will make any difference to the memory issue, but you might wanna replace DrawMovie(hmovie) with DrawMovie hmovie,0,0,256,128 when testing that code. |
| ||
| maybe they have a system in place for flushing the oldest data from memory when you have used up all the available buffer and try to load a new movie, dunno. Deffinatly doesn't seem to flush it immediatly on close tho. |
| ||
| Thanks Rroff, I already do DrawMovie hmovie,0,0,256,128 etc in my main code. It might be that only Blitz Support can answer his one. Hell, Blitz Support? Any ideas? |
| ||
| heh I was testing it and getting a black cube with the frame counter on it and was like "eh?" I played with a bunch of stuff but I can't see any way myself to clear the memory without having access to the blitz code itself, tho I thought of several possible work arounds, but they aren't 2 second coding jobs. |
| ||
| I think it's time to bounce this over to the bugs forum. |
| ||
| Since we are taking about Movies, I hope Mark will also add exact Frame Access and Pause / seek, cause I tried to use MCIsendstring as a replacement, but MCI is definitively driving me crazy. Everything works nicely - sometimes, depending on the color of my neighbours socks and the weather. |
| ||
| John, I had this same problem a while back - did not find a solution I'm afraid. Can also confirm your suspicions are true - the system did die a death after a (substantial) amount of continuous play. The program in question was used at an exhibition, 3 days of 9 hours each - the memory would run out around lunchtime each day, so I restarted the app. about every three hours to be safe. After the show tracked the leak down to the movie section - had a menu system where a random movie was called in as a background to the options screen. Sorry to be no help - but can at least confirm your findings. Funky Frank |
| ||
| Thanks Frank. At least it's good you've confirmed this. As I say, I've bounced this over to the bugs forum. jfk, I've also used MCIsendstring quite extensively, but not with Blitz3D. I'm puzzled how you could do this. Any chance of sharing? |
| ||
| It's in the code archives. The sucker simply refuses to actually go to a frame when I tell it to SEEK and Update etc :) - well sometimes. and sometimes not... (Note: you can only access the frames (eg using copyrect) when you are in fullscreen mode, on the frontbuffer) |
| ||
| "The sucker simply refuses to actually go to a frame" Yeah that sounds like MCIsendstring! Oh god, we really need an update to the movie and sound systems in Blitz. Mark???? |
   |