[Live-devel] Open RTSP and video file splitting...

[Matteo Lisi]

Hi I did a quick change on the QuickTimeFileSink class , for runtime 
output file name changing.

You can see below the code:

void QuickTimeFileSink::ChangeOutputFile(UsageEnvironment& env, char * 
outputFileName)
{
printf("ChangeOutputFile\n");
completeOutputFile();
CloseOutputFile(fOutFid);
fOutFid = OpenOutputFile(env, outputFileName);

// Begin by writing a "mdat" atom at the start of the file.
// (Later, when we've finished copying data to the file, we'll come
// back and fill in its size.)
fMDATposition = TellFile64(fOutFid);
addAtomHeader64("mdat");
// add 64Bit offset
fMDATposition += 8;

if (fOutFid == NULL) return;
}

The result is that only the first videofile is visible with a video 
player, while the others files is not valid.

I suppose that I forgot to update something on the file's header, but what ?

Instead if I use the follow command:

./vigilartsp -v -w 640 -h 480 -f 25 rtsp://admin:12345@192.168.2.62

(without -4 flag)

when I call the ChangeOutputFile its gave me "Segmentation fault"

why ?


Many Thanks.

Il 16/12/2010 18:36, Ross Finlayson ha scritto:
>> But often the program exits in "Segmentation Fault", and I don't know 
>> why...
>
> The reason is that you are closing (and deleting) your 'data sink' 
> object - "qtOut" - but you are still 'playing' that object. I.e., the 
> code thinks that it should still be receiving incoming network data 
> into the original "qtOut" object.
>
> The right way to fix this - with minimal disruption to the existing 
> code - is not to make any changes to the network reading/recording 
> mechanism, but instead to use a different 'data sink' class - one that 
> knows how to periodically close/reopen its output file, but without 
> having to delete/recreate the 'data sink' object itself.
>
> So, I suggest that you subclass the "QuickTimeFileSink" class to do this.
>
> Unfortunately, to do this, you're going to have to make some 
> modifications to "liveMedia/include/QuickTimeFileSink.hh" - to change 
> some fields and member functions from "private:" to "protected:" - so 
> you can subclass "QuickTimeFileSink". (In particular, you will 
> definitely need to change the constructor and destructor, and 
> "completeOutputFile()" and "fOutFid" to "protected:") Once you've done 
> this, please let us know which fields/functions you needed to make 
> "protected:", and I'll change the next released version of the code to 
> make at least those fields/functions "protected:". That way, you won't 
> need to keep changing the released code each time.


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