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Comparing how two software handle audio - Lossless playback problem
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post Nov 20 2013, 23:44
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I use a piece of software called OtsAV for DJ and radio playout purposes (it largely has no competitors below the four-figure mark, so it's difficult to change), and I've been having some trouble getting it to playout my lossless audio in, well, lossless form.

Long story short, when I play out lossless audio in foobar2000 it is represented faithfully, but in OtsAV it's truncated at the 19000hz or so mark. This doesn't happen in Ots Studio, another piece of their software, and I'm told that OtsAV handles lossless perfectly well and that other users don't get this problem. Observe the issue below, OtsAV is on the left and foobar2000 on the right:



I've tried every setting within the software, and they're both using the same sound card, so there's nothing obvious that would be causing this.

Therefore, what I'd like to do is analyse how foobar2000 plays back and handles its audio, and how OtsAV does it in comparison, to find out what the difference is. The only thing is, I've not done this before and so have no idea where I'd start.

Is there a piece of software that would do this, showing the audio pipeline for the software (or more likely, the audio as it is played) so that I can identify any differences? Or failing that, any idea what the problem could be? It's Windows 7 that I'm on by the way.

Thanks for any help smile.gif
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saratoga
post Nov 21 2013, 00:21
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It looks like OtsAV has a lowpass filter enabled. Check and see if you can disable it. If not, you'll have to either accept that some irrelevant ultrasonic content has been removed, or find some other software.
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DVDdoug
post Nov 21 2013, 02:20
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QUOTE
OtsAV for DJ and radio...
The audio bandwidth of FM radio is limited because of the 19kHz stereo multiplex carrier. But, I'm pretty sure the low-pass filter is part of the transmitter so I don't know why they would put a filter in the software.

Maybe there's a "radio" option that you can turn-off???

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saratoga
post Nov 21 2013, 03:21
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QUOTE (DVDdoug @ Nov 20 2013, 21:20) *
QUOTE
OtsAV for DJ and radio...
The audio bandwidth of FM radio is limited because of the 19kHz stereo multiplex carrier. But, I'm pretty sure the low-pass filter is part of the transmitter so I don't know why they would put a filter in the software.

Maybe there's a "radio" option that you can turn-off???



The low pass in fm is more like 14 to 15 khz, since the audio needs to be well separated from the carrier.
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