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Subject: Corrupt recorded file

Corrupt recorded file

From: Michael Hentschel <michael.hentschel_at_gmx.at>
Date: Mon, 26 Jan 2009 16:47:16 +0100

Hello,

I posted this problem already, but now I have gained some additional
insight.

Here is what happened: I have recorded a concert on my Archos Jukebox
Recorder 20 V1. Rockbox 3.0.1 created a ~192 MB file and the total
length displays ~2h 33min. After 38 minutes of playback Rockbox and most
other MP3 players (Winamp, Foobar2000, ...) stop playback. Windows
Media-player continues playing but starts to skip frames and sounds like
fast-forwarding. When I run MP3-analysing tools on the file (eg. mp3val)
they say that after 38 minutes there are no mp3 frames any more, just
garbage.
I searched the file in a hex editor and indeed after 38 minutes there
are no more proper frame headers. Up to this point all headers start
like "FF FA" (for MPEG I and Layer III) and continue with "?0 64" (where
?0 is the bitrate and 44.1 kHz, 64 is joint-stereo and other stuff).
Only occasionally there is an "FF FA" but then the rest of the header
doesn't make sense.
BUT: since Windows Mediaplayer still can extract some (partially)
meaningful audio data, I have the suspicion that only a few bits might
be missing somewhere, messing up all successive headers.

Has anyone experienced such corruption with Rockbox-recorded files and
knows, what might have happend?

thanx,
Mike

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Received on 2009-01-26


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