[Flac] Flac encoding of 88.2kHz files -- not streamble?

[Josh Coalson]

someone asked something similar and I replied here
http://forums.slimdevices.com/showpost.php?p=187979&postcount=30

the message about 'not streamable' instead of 'not subset' is
confusing though, I should change that.

Josh

--- Keith Robertson <kjrobert at alumni.uwaterloo.ca> wrote:

> Hi.
> 
> I'm trying to encode some high sample rate music (88.2kHz) into flac.
> 
> When trying this with flac 1.1.4 I get the following error:
> 
> #####
> keithr at eng:~$ work/flac-1.1.4/src/flac/flac Serenissima02.wav
> <snip copyright>
> Serenissima02.wav: WARNING: legacy WAVE file has format type 1 but 
> bits-per-sample=24
> Serenissima02.wav: WARNING: skipping unknown sub-chunk 'fact'
> 
> Serenissima02.wav: ERROR initializing encoder
>                     init_status = 
> FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE
> 
> The encoding parameters specified do not conform to the FLAC Subset
> and 
> may not be streamable or playable in hardware devices.  If you really
> 
> understand the consequences, you can add --lax to the command-line 
> options to encode with these parameters anyway.  See 
> http://flac.sourceforge.net/format.html#subset
> #####
> 
> I fully comprehend that you can make this work with --lax.  However,
> I'm 
> not just trying to make it work.  I'm interested in ensuring that the
> 
> file plays on as wide a variety as players as possible.  I'm 
> particularly concerned about the error and comment saying that the 
> resulting file is not streamable.
> 
> Based on my reading of the flac spec I'm not sure I follow this.  I 
> understand that the resulting file will not be part of the Flac
> subset. 
>   Further, I understand that some decoders that only implement the
> Flac 
> subset will not be able to play the resulting file.  However, I'm 
> confused that it says that it will not be streamable.  I would have 
> thought a file is streamable as long as all information needed for 
> decoding is contained in each frame header rather than just in the 
> METADATA_BLOCK_STREAMINFO at the beginning.  When encoded with --lax,
> 
> I've checked that the resulting binary flac file does indeed place
> the 
> sample rate in each frame header.  It does so via the extension to
> have 
> 'unusual' sample rates at end of the header.  In this case the sample
> 
> rate field is 0b1110 (0xE) and resulting end of frame header 16 bit 
> sample rate in 10's of Hz is 0x2274 (8820 --> 88.2kHz).
> 
> So... shouldn't this file be streamable?  Is this error more
> correctly 
> articulated FLAC__STREAM_ENCODER_INIT_STATUS_NOT_SUBSET, rather than 
> NOT_STREAMABLE?  Or have I missed the boat...?
> 
> Cheers.
> 
> Keith
> 
> P.S.  There are quite a few reserved bits in the sample rate field
> (0001 
> -0011).  What are the odds of getting 88.2kHz declared to be part of
> the 
> subset?  This would be the most ideal solution from my perspective as
> a lot of high quality recordings are archived in 88.2kHz.


 
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