Re: Crash Proof Apple Lossless
Re: Crash Proof Apple Lossless
- Subject: Re: Crash Proof Apple Lossless
- From: Brian Willoughby <email@hidden>
- Date: Sat, 15 Nov 2008 17:48:09 -0800
I believe that CAF was designed to be crash-proof. Check the
specification, available from Apple, or perhaps someone else here can
confirm. I believe that only SDII and CAF are crash-proof. However,
if you're using CAF to hold Apple Lossless encoding, then I'm not
sure whether the crash-proof feature would be fully possible. On
that note, I'm not sure that any compressed coding will preserve as
much audio data during a crash as an uncompressed coding. You may
have to choose between the space-savings of compression and the
reliability of a fully crash-proof format.
Brian Willoughby
Sound Consulting
On Nov 15, 2008, at 16:53, Dominic Feira wrote:
On Nov 15, 2008, at 3:03 PM, tahome izwah
2008/11/14 Dominic Feira <email@hidden>:
Hi. I rely quite heavily on Apple Lossless audio. I would like
to crash
proof recording to Apple Lossless. MPEG-4, CAF, and QuickTime
Movie all
require that the file is closed properly in order to open them.
Just curious: Where did you get that info from?
We're accessing files that are open for writing from a separate
ExtAudioFile instance (for reading) without problems in one of our
apps. You might need to call AudioFileOptimize() to flush data to the
file before you can read them but other than that we've not had any
problems with it...
--th
My concern is recovering from a crash. In all of the mentioned
formats if the app crashes before the file is closed the packet table
is never written to the file. It isn't possible to flush data to the
file if the app has crashed.
-- Dominic Feira
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