[Vorbis] Fwd: [Vorbis-dev] Zero length reported.

[Jim Credland]

Hello - I send this to the vorbis-dev list yesterday, but I’m working if it would not have been better targeted at this list. 

Sorry for the spam if you are on both :)

> Begin forwarded message:
> 
> From: Jim Credland <jim at credland.net>
> Subject: [Vorbis-dev] Zero length reported.
> Date: 6 April 2017 at 15:43:18 BST
> To: vorbis-dev at xiph.org
> Cc: Maciej Dudek <maciej.dudek at gmail.com>
> 
> Hello - I have two files which play back in VLC correctly.
> 
> They were encoded using this command:
> 
> ffmpeg -y -i '/tmp/2e905b981d30324f9a0664cbabb3f59a20170406-21128-r0neh9.wav' -acodec libvorbis '/tmp/2e905b981d30324f9a0664cbabb3f59a20170406-21128-r0neh920170406-21128-146yyex.ogg
> 
> However ov_pcm_total reports a zero length for one of the two files.  Is this a problem with my use of the ov_pcm_total function or a problem with the encoding?  The files are here http://www.credland.net/ogg/ along with a copy of the source code.
> 
> This is a problem because the same function call is used by the JUCE ogg decoder we are using in an application.  
> 
> Any thoughts?
> 
> thanks in advance, Jim.
> 
> 
> 
> The output is:
> 
> jim at snoopy ~/trouble.vorbis/a
> $ ./a < 53884c2935e6b47938f91ca78b0c2473a85730833138370caedbb66a74995130.ogg
> encoder=Lavf53.32.100
> 
> Bitstream is 2 channel, 44100Hz
> Encoded by: Lavf53.32.100
> 
> Length: 0
> 
> jim at snoopy ~/trouble.vorbis/a
> $ ./a < d7d5ef8e6c7fad33f922924d0a05591277654d53941d43518f1fe8580c7ea3f9.ogg
> encoder=Lavf53.32.100
> 
> Bitstream is 2 channel, 44100Hz
> Encoded by: Lavf53.32.100
> 
> Length: 1146624
> 
> 
> Source:
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <math.h>
> #include "vorbis/codec.h"
> #include "vorbis/vorbisfile.h"
> 
> #ifdef _WIN32
> #include <io.h>
> #include <fcntl.h>
> #endif
> 
> char pcmout[4096];
> 
> int main (int argc, char** argv)
> {
>    OggVorbis_File vf;
>    int eof = 0;
>    int current_section;
> 
> #ifdef _WIN32
>    _setmode (_fileno (stdin), _O_BINARY);
>    _setmode (_fileno (stdout), _O_BINARY);
> #endif
> 
>    if (ov_open_callbacks (stdin, &vf, NULL, 0, OV_CALLBACKS_NOCLOSE) < 0)
>    {
>        fprintf (stderr, "Input does not appear to be an Ogg bitstream.\n");
>        exit (1);
>    }
> 
>    {
>        char** ptr = ov_comment (&vf, -1)->user_comments;
>        vorbis_info* vi = ov_info (&vf, -1);
> 
>        while (*ptr)
>        {
>            fprintf (stderr, "%s\n", *ptr);
>            ++ptr;
>        }
> 
>        fprintf (stderr, "\nBitstream is %d channel, %ldHz\n", vi->channels, vi->rate);
>        fprintf (stderr, "Encoded by: %s\n\n", ov_comment (&vf, -1)->vendor);
>        fprintf (stderr, "Length: %lld\n\n", ov_pcm_total(&vf, -1));
>    }
> 
>    return 0;
> }
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