Re: AAC Priming Info Under 64-bit
Re: AAC Priming Info Under 64-bit
Unfortunately I don't have a solution but I can confirm it fails on all of my audio devices in 10.7.4 64 bit. I get 0 leading and 0 trailing frames. I may poke around a bit to see if I can figure out why it isn't working as expected.
Mike
On Oct 18, 2012, at 12:59 PM, Michael Miller wrote:
> Hi all,
>
> I'm running into a strange issue related to priming info in the OS X AAC decoder. Under 32-bit, all is well: my AudioConverter instance reports a 2112 leading frames and 0 trailing frames as expected. However, under 64-bit, identical client code, input and output formats, and magic cookie (i.e., the same file) lead AudioConverter to report 0 leading frames. I narrowed it down to the AAC codec and have reproduced the same behavior querying the decoder directly. I've attached a minimal sample project that demonstrates the issue I'm seeing. I've also filed a bug report under bug ID #12526917.
>
> In the mean time, I'm hoping to find some way to work around the issue. Has anyone else run into this particular problem? If so, what have you done to avoid it? I'm considering special-casing the 2112 frames for the AAC format variants but I haven't investigated enough to know if this affects any other formats. I'm also considering making a 32-bit helper process to report the priming info. Unfortunately, I can't use the AudioFile API to get the packet table because I'm dealing with both movie files and audio files. And AVFoundation doesn't seem to provide this information in any direct way, though I can introspect about it in a somewhat sketchy fashion.
>
> Thanks for your time!
> Michael Miller
>
> <AACDecoderBug.zip> _______________________________________________
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