[opus] quality opus_demo vs opusenc

[Quilino Cifuentes]

Hi,
I am interested in this part of the answer:
"Make
sure both are also linked to the same libopus (opusenc could be using
the system libopus 1.0.x while opus_demo is from git)"
I dowloaded a tarball distrib of libopus (1.1-beta),build and
installed it,and afterwards did the same with opus-tools (0.1.7),using
the former installed libopus library (also using libogg 1.3.1).
When I execute opus-demo it says it uses libopus 1.1-beta; when I
execute opusenc,it says "Encoding using libopus-1.1-beta".
Should I assume that my installation is correct and that both
utilities use my locally intalled version of libopus?

Thanks,
Quilino

On 10/15/13, Jean-Marc Valin <jmvalin at jmvalin.ca> wrote:
> I suspect the main difference is due to time alignment of the samples
> and the exact trimming at the beginning and at the end of the encoded
> files. I also note that there's a missing "--" in front of "bitrate" and
> only one "-" instead of two for cvbr in your opusenc command line. Make
> sure both are also linked to the same libopus (opusenc could be using
> the system libopus 1.0.x while opus_demo is from git). In the end, the
> quality should be almost the same, but the files won't be identical due
> to minor differences in the way the first and last frame are handled.
>
> Cheers,
>
> 	Jean-Marc
>
> On 10/15/2013 05:22 AM, Quilino Cifuentes wrote:
>> Hi,
>> I have found differences in quality between opus_demo and
>> opusenc/opusdec.
>>
>> I used for both applications the same raw pcm file,16 bit,48khz,litle
>> endian. i use libopus 1.1-beta and opus-tools-0.1.7.
>>
>> The command for opus_demo is:
>>
>> opus_demo audio 48000 1 64000 -cvbr -framesize 10 in.pcm out.pcm
>>
>> For opusenc/dec:
>>
>> opusenc --raw --raw-chan 1 bitrate 64 -cvbr --framesize 10 in.pcm in.opus
>>
>> opusdec in.opus out.pcm
>>
>> the PEAQ value for opus_demo is -0.152 and for opus-tools is -0.449
>>
>> Should I expect the same quality or are opus_demo and opusenc/dec
>> different by definition?
>>
>> Thanks,
>> Quilino
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>>
>
>