Playing sound files

Peter Bogdanoff bogdanoff at
Mon Apr 25 23:51:51 EDT 2016

No, callbacks are still alive and well in AV Foundation.

I’m seeing that adding a parameter to a callback list isn’t working now. Parameters weren’t in  the dictionary pre-LC6.7 but seemed to work.

Issues with QT—things used to work better; it seems that as new versions of OS X are released, QT breaks here and there. I can’t record audio files now. It also seems that QT’s ability to play files from the Internet is degrading with OS upgrades. Data download is very slow and often stalls.

AV Foundation, on the other hand, is great—fast and reliable.

Peter Bogdanoff

On Apr 23, 2016, at 11:34 PM, J. Landman Gay <jacque at> wrote:

> On 4/24/2016 12:59 AM, Peter Bogdanoff wrote:
>> You can do timed subtitles now using callbacks—if you want the text
>> to display outside the player, like in a field.
> Does AV Foundation support callbacks now? I thought those were lost when it was implemented.
> I was using callbacks to do titling control with streaming audio back when the player still used QT. It worked great until we tried it on a slow internet connection where it fell apart badly. I could never figure out why, since you'd think a callback would report the currentTime regardless of the streaming speed, but it didn't.
> We removed the synchronization for that reason. Later I remember hearing that callbacks weren't supported any more on OS X. But it's still there in the dictionary so now I'm not sure where it stands.
> -- 
> Jacqueline Landman Gay         |     jacque at
> HyperActive Software           |
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