[Live-devel] attempting to read more than once

[Neil Alexander]

On Aug 9, 2005, at 12:40 AM, Ross Finlayson wrote:

>> On a "live" stream, on certain cameras I get the following:
>>
>> FramedSource[0xd57660]::getNextFrame(): attempting to read more  
>> than once at the same time!
>>
>
> The message means just that - you are attempting to call  
> "getNextFrame()" on the same object more than once at the same time.
>
> Make sure that "FramedSource::afterGetting()" gets called on the  
> object before "getNextFrame()" is called again.

Correct me if I have this wrong. I am using the sample framed source  
file as my starting point. Streams are initiated from the rtsp  
server. I only get a "doGetNextFrame()" call after a QT Player calls  
the rtsp:// etc. ONCE. Then the "deliverFrame()" is called repeatedly  
after that.

doGetNextFrame() doesn't have a call to the afterGetting() - but  
deliverFrame() does. And it's being called after I fill in each frame  
as required.

Also, while I have you on the line, another query.

I currently allocate the memory for the framedSource->fTo in the  
doGetNextFrame() since it's only called once. Should I move this  
somewhere else? Also, I'm a little fuzzy about how to fill in the  
fPresentationTime and fDuration variables. Currently, I use the  
desired framerate of my video source (for example, at 7.5fps I assume  
duration is 133333 microseconds. Is that reasonable?

Thanks!

Neil Alexander


>
> In other words, every call to "getNextFrame()" must (eventually) be  
> followed by a call to "FramedSource::afterGetting()" (once the data  
> has become available and has been delivered to the client), and you  
> must not call "getNextFrame()" again until after that has happened.
>
> Remember, You Have Complete Source Code.
>

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