[Libav-user] Encoding to FLAC

[Peter Belkner]

Resolved myself: The number of frames should be taken from the encoder.

On 12.12.2014 01:03, Peter Belkner wrote:
> Hello,
>
> I'm trying to encode to FLAC via avcodec/avformat. Unfortunately this 
> gives invalid FLACs. I'm following "doc/examples/transcoding.c" which, 
> of course, makes the problem reproducible.
>
> If I transcode a valid FLAC to FLAC with the example program 
> "transcode" I get a FLAC which is not valid according to the FLAC 
> reference encoder:
>
> > $ flac -t ./test/output/Track101.flac
> >
> > flac 1.2.1, Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  
> Josh Coalson
> > flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and 
> you are
> > welcome to redistribute it under certain conditions.  Type `flac' 
> for details.
> >
> > Track101.flac: ERROR, MD5 signature mismatch
>
> Such a FLAC can't be played with a typical FLAC decoder, but with FFmpeg.
>
> On the other hand, the command line "ffmpeg" program produces valid 
> FLACs.
>
> What's the difference between "ffmpeg" and "transcode"? What's missing 
> in "transcode"?
>
> Peter
>
>
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