[Flac-dev] wav to flac corruption

[Matthew Davis]

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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