Video players

[Hartmut Noack]

Am 05.06.2013 16:11, schrieb Len Ovens:
> 
> On Wed, June 5, 2013 2:34 am, edmund wrote:
>> On Wed, 05 Jun 2013 01:21:19 +0200
>> Hartmut Noack <zettberlin at linuxuse.de> wrote:
>>
>>> Am 04.06.2013 02:43, schrieb Len Ovens:
>>>>
>>>> On Mon, June 3, 2013 8:02 am, edmund wrote:
>>>>
>>>>> What are you calling "uncommon" sample rates? Ubuntu Studio is for
>>>>> multi media and in my case High res audio. Here we use 96 kHz and
>>>>> 192 kHz sample rates.
>>> Of course I have recorded in these samplerates also and in very few
>>> cases it really makes a difference. Most notably to me was, that Alsa
>>> Modular Synths sounds quite different at 96KHz.
> 
> That is possible... but, the audio in and out of a computer even at 96Khz
> is still limited to just over 20kHz. The differences you are hearing may
> be as a result of the math at higher frequencies affecting what ends up in
> the 20-20kHz passband.

Thats what I suspect also. Zynadd does sound a bit different also at
higher rates and mst interesting:

1: Play some notes with AMS and record it at 96KHz
2: Do the same at 48KHz and compare: they will sound different.
3: now resample both recordings to 44.1/16 and compare again: they will
still sound different

Looks, like the samplerate of the recording does not cause the audible
difference. The samplerate of the PCM-stream AMS is working with does.

>>>
>>>>> VLC player,
>>>
>>> Is made to play the audio, that is relevant out there, where people
>>> listen to music that is mixed and mastered and that is: 48KHz Video,
>>> 44.1KHz Audio and that is it.
> The bluray standard is 192/24, you don't get anything extra for your
> money,  but it is the standard. Much of the audio on such music started
> out as 48/16... (If it was on tape originally then 48/13 or less)
> 
>>>> seems to play these formats too but it doesn't!
>>>>> When I play a 80 kHz sine it is audible
> 
> Shouldn't be, but then really there is no reason to play an 80k sine
> through a computer because there are no known sound interfaces able to
> reproduce signals of that frequency anyway. The analogue part of the chain
> makes sure of that.
> 
>> No I mean playing a 80 kHz sine (with a 192kHz sample rate)
>> I made a number of sines with audacity and played them with VLC among
>> other players, VLC  produces ghost sounds with sine waves above a
>> certain frequency.
>>
>> So paying music with VLC in that format makes you hear things you never
>> heard before, great! Pity that the difference is fake and distortion
>> rather then more music information.
> 
> That would be whatever does the resample or down/upsample. However, there
> is no (and shouldn't be anyway) program material (even bluray 192 sample
> rate stuff) that has 80khz content anyway. Any of the mics one can buy
> start to roll of around 18hz (even condenser mics). So any signals above
> that are artificially created. Buy some analogue test equipment and test
> it for yourself. See what the highest frequency is that you can import and
> export with your sound card. There is an audible difference, but it is not
> in audio at 80khz.
> 
> Many audio programs use poor quality resampling BTW. VLC would depend on
> it's libs.
> 
> This is something to consider. There are a lot of video players, but they
> depend on only a few codec libs. We should break down our choices based on
> the underlying libs I think.
> 
> 
> 
>