[opus] Regarding Opus Codec Input output file.

[Sakharam Thorat]

Thanks Vishwa, I will test and let you know.

Best Regards,Sakharam Thorat.> Date: Mon, 13 Apr 2015 11:37:18 -0500
> Subject: Re: [opus] Regarding Opus Codec Input output file.
> From: viswanath.puttagunta at linaro.org
> To: sakharam.thorat at outlook.com
> CC: opus at xiph.org
> 
> Hi Sakharam,
> 
> I see 2 potential issues with what you are doing.
> 1. ./opus_demo -e voip 48000 2 16 music_orig.wav testcase30.opus
>     in above command, "16" for bits/sec seems too low. I'm no audio
> expert, but just cant convince myself you can get any reasonable audio
> data with 16 bits/sec. FYI, I was able to encode and decode with 16
> bits/sec, but when I played the decode file with "aplay", couldn't
> hear anything.
> 
>     I used 96000 bits/sec with command
>     ./opus_demo -e voip 48000 2 96000 music_orig.wav testcase30.opus
> 
>     Then decoded with same command you gave
>     ./opus_demo -d 48000 2  testcase30.opus testcase31.wav
> 
>      And played using command (on my ubuntu 14.04 linux box)
>      aplay -t raw -c 2 -r 48000 -f S16_LE testcase31.wav
>      and was able to hear the audio clearly
> 
> 2. The file that gets generated with "./opus_demo -d 48000 2
> testcase30.opus testcase31.wav"
>      (testcase31.wav) is just a raw data file.. It does not have wav header.
>      For example, if you do
>     $ file music_orig.wav
>        music_orig.wav: RIFF (little-endian) data, WAVE audio,
> Microsoft PCM, 16 bit, stereo 48000 Hz
> 
>       But, for testcase31.wav, you get
>     $ file testcase31.wav
>        testcase31.wav: data
> 
>        So, if your audio quality app is looking for Wav header, it
> will not find it... You will need to add this header to your data file
> to make it a real "wav" file.
> 
> Regards,
> Vish
> 
> 
> On 13 April 2015 at 07:29, Sakharam Thorat <sakharam.thorat at outlook.com> wrote:
> >
> > Hi All,
> >
> > Need Help !
> >
> > I am interested testing opus codec encoding decoding qaulity. for this have
> > complied opus code codec from souce. After compiling i got opus_demo app.
> >
> > for Encoding i followed below steps:
> > 1) Reference file used music_orig.wav
> > (http://www.opus-codec.org/examples/samples/music_orig.wav)
> >        Number of samples : 4358219 (90.8 s)  2015-04-13 10:40:07 UTC
> >        Sampling frequency: 48000 Hz
> >        Number of channels: 2 (16-bit integer)
> >     File name: music_orig.wav
> >     Header length: 44
> >     Sampling frequency: 48000
> >     No. samples: 4358219
> >     No. channels: 2
> >     Data type: integer16
> >     File byte order: little-endian
> >     Host byte order: little-endian
> > 2) I encode this file using following command
> >
> > ./opus_demo -e voip 48000 2 16 music_orig.wav testcase30.opus
> >
> > 3) Then Decoded testcase30.opus using following command
> >
> > ./opus_demo -d 48000 2  testcase30.opus testcase31.wav
> >
> > 4) My quality monitoring app not able to identify file type of
> > "testcase31.wav" , gives following error.
> >
> > AFfindType - Unknown audio file type
> > AFopnRead: Error opening input audio file "testcase31.wav"
> >
> >
> > Can some body please take look and verify that i have followed correct steps
> > while encoding and decoding , else let know correct steps.
> >
> > If any body have quality testing related resouce , test cases, sample files,
> > web links please share.
> >
> >
> > Best Regards,
> > Sakharam Thorat.
> >
> > _______________________________________________
> > opus mailing list
> > opus at xiph.org
> > http://lists.xiph.org/mailman/listinfo/opus
> >
 		 	   		  
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