[Flac-dev] wav to flac corruption

Wed Feb 6 12:52:51 PST 2008

And more info...

Screen capture of the WAV file's hex.  This tells me little, but maybe
someone out there knows more about this than me.

http://img139.imageshack.us/my.php?image=screenshot251awavghexnd1.png

Thanks again,
Matthew

On Feb 6, 2008 12:18 PM, Matthew Davis <zasdarq at gmail.com> wrote:

> Came across another error that might help!  Using flac -t I get:
>
> 251_A.wav: *** Got error code
> 0:FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC
> 251_A.wav: *** Got error code
> 0:FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC
>
> Thanks,
> Matthew
>
>
> On Feb 6, 2008 3:19 AM, Matthew Davis <zasdarq at gmail.com> wrote:
>
> > Thank you for the reply!  I know that my system can play flac files,
> > I've played others I've managed to convert using both of those programs.
> > I'm only running into difficulty when it comes to these large WAV files.  By
> > "Does not work" I mean that they do not play, and instead I receive the
> > errors I mentioned in my original post.  I wasn't actually intending to use
> > wavsplit to split the flac files, it was just something I had during some
> > testing for how to split these files.  I'm actually going to be splitting
> > during the conversion since the flac tool supports specifying time marks.
> >
> > Is there something that could be wrong with the WAV files that prevent
> > them from being able to convert to FLAC?  Is there someway I can test the
> > integrity of the WAV files?
> >
> > Thanks again in advance,
> > Matthew
> >
> >
> > On Feb 5, 2008 6:07 PM, Brian Willoughby <brianw at sounds.wa.com> wrote:
> >
> > > Matthew,
> > >
> > > I don't think I can answer your entire question, but I will list a
> > > few pieces of information.
> > >
> > > 1) I regularly convert very large AIFF files, up to 4 GB, using
> > > flac.  I sometimes work with WAV, and that seems to work, too.  On my
> > > Mac, I can play flac files just fine in Play.app, VLC, and my own
> > > software.
> > >
> > > 2) What do you mean the flac "files do not work"?  You mean they
> > > don't play?  They will only play from software with full support for
> > > the flac format, which means many popular applications will not work.
> > >
> > > 3) I have not heard of "flac123" - perhaps this program is out of
> > > date or is missing support.  Maybe the author(s) of flac123 will
> > > comment.
> > >
> > > 4) Those warning mean that your Broadcast Wave File (BWF) is being
> > > converted to standard audio flac, without any of the metadata from
> > > the BWF.  You'll need to use --keep-foreign-metadata if there is any
> > > importance to having the original BWF restored later.  However, if
> > > all you need is the audio and none of the other information, then you
> > > can safely ignore these warnings.  FLAC always preserves all of the
> > > audio losslessly, you only ever have to worry about losing non-audio
> > > data.
> > >
> > > 5) You can only split a flac file if your splitting program
> > > understands the format.  You should learn the FLAC library and see
> > > what kind of support it has for breaking a stream.  If you use other
> > > tools to split the file without knowledge of the FLAC format, you
> > > will lose data.  In other words, you must develop a new program,
> > > maybe called "flacsplit," to do this, because wavsplit will not work
> > > on FLAC (unless they parse the FLAC format correctly as well as WAV).
> > >
> > > I hope some of this information helps.
> > >
> > > Brian Willoughby
> > > Sound Consulting
> > >
> > >
> > > On Feb 5, 2008, at 16:54, Matthew Davis wrote:
> > > I'm attempting to convert fairly large WAV files (90 - 800 MB each)
> > > using flac but the files do not work after the encoding. (The play
> > > fine in wav format)
> > >
> > > Command I'm using:
> > >
> > > flac --verify -8 file.wav
> > >
> > > Attempting to run the file with either flac123 or the default player
> > > for Ubuntu (Movie Player?) results in the extremely terse messages:
> > > Default Player: "An Error Occurred: Could Not Decode Stream"
> > > flac123: "error handler called!" <- repeated over and over and over
> > >
> > > There are no errors during the encoding, though there are some
> > > warnings.  Here is the output:
> > >
> > > asdarq at eighty-desktop:~$ flac -f -8 --verify 10_A.wav
> > >
> > > 10_A.wav: WARNING: skipping unknown sub-chunk 'bext' (use --keep-
> > > foreign-metadata to keep)
> > > 10_A.wav: WARNING: legacy WAVE file has format type 1 but bits-per-
> > > sample=24
> > > 10_A.wav: WARNING: skipping unknown sub-chunk 'minf' (use --keep-
> > > foreign-metadata to keep)
> > > 10_A.wav: WARNING: skipping unknown sub-chunk 'elm1' (use --keep-
> > > foreign-metadata to keep)
> > > 10_A.wav: 100% complete, ratio=0.62410_A.wav: WARNING: skipping
> > > unknown sub-chunk 'regn' (use --keep-foreign-metadata to keep)
> > > 10_A.wav: WARNING: skipping unknown sub-chunk 'ovwf' (use --keep-
> > > foreign-metadata to keep)
> > > 10_A.wav: WARNING: skipping unknown sub-chunk 'umid' (use --keep-
> > > foreign-metadata to keep)
> > > 10_A.wav: Verify OK, wrote 168060055 bytes, ratio=0.624
> > >
> > >
> > > As a final random test, I attempted to split one of the wav files (my
> > > ultimate goal is split flac files) using wavsplit.  That resulted in
> > > the following output/error.
> > >
> > > Channels: 1
> > > Samplerate: 96000Hz
> > > Samplebits: 24
> > > Databytes: 269503836
> > >
> > > Split         Hours  Mins   Seconds         Bytes         %
> > > Bad file format
> > >
> > >
> >
>
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