Re: Recovering MPEG-4 and/or lossless audio files
Re: Recovering MPEG-4 and/or lossless audio files
- Subject: Re: Recovering MPEG-4 and/or lossless audio files
- From: Iain McCowan <email@hidden>
- Date: Mon, 13 May 2013 11:51:02 +1000
Hi Chris,
I feel your pain.
No solution for you, but just to echo that our app has the same problem - every now and then we get a user who has lost their recording due to unreadable M4A file, even though our code is correct. It is rare, but gut-wrenching when it happens.
Only observation I can make is that we have two audio recording implementations, depending on whether people use the built-in mic (we use AVFoundation audio recorder) or our own array mic (we use ExtAudioFile code for that). The corrupt M4A's seem to only happen for people using built-in's, ie the AVFoundation audio recorder class.
The only solution I have found is an unrelated third-party commercial service who were able to recover the audio file for the users, but at a cost of about $70+. The third-party have some software that they customise for each audio file it seems. I'd love to know how they do it. I can pass you the details if you want to email me off list.
(Of course the other obvious advice is to record to another less risky format and then convert, but this has usability issues for us due to the large multi-track recordings often over several hours).
cheers,
Iain.
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