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Author Topic: Q. When does gapless playback have gaps?  (Read 3089 times)

pluto

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Q. When does gapless playback have gaps?
« on: December 26, 2012, 02:22:43 pm »


A. When resampling is taking place.

I was playing some 96kHz FLACs while resampling to 48kHz and there were small but clearly discernible gaps between the tracks - a few tens of mS, I would guesstimate. Turn off the resampling and all's well.
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mojave

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Re: Q. When does gapless playback have gaps?
« Reply #1 on: December 27, 2012, 09:23:33 am »

Is this with "Play files from memory and not disc" selected? If so, does it play correctly when unselected?
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pluto

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Re: Q. When does gapless playback have gaps?
« Reply #2 on: December 27, 2012, 02:39:36 pm »

Is this with "Play files from memory and not disc" selected? If so, does it play correctly when unselected?

No, normal playback.
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pluto

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Re: Q. When does gapless playback have gaps?
« Reply #3 on: January 03, 2013, 09:00:30 am »

Now that everyone's back at work, may I bump http://yabb.jriver.com/interact/index.php?topic=76772.msg519958#msg519958 for developer's comment.

Happy new year!
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Matt

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Re: Q. When does gapless playback have gaps?
« Reply #4 on: January 03, 2013, 09:35:05 am »

I can't explain why this would happen.  The resampler is going to see a continuous stream of data during playback, so there's no reason that would cause gaps.

What is your between tracks mode? 

Does toggling the option to suppress silence between tracks make a difference?
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Matt Ashland, JRiver Media Center

pluto

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Re: Q. When does gapless playback have gaps?
« Reply #5 on: January 03, 2013, 10:06:03 am »

What is your between tracks mode?

Switch tracks: standard gapped (5s)
Gapless for sequential album tracks enabled.

Does toggling the option to suppress silence between tracks make a difference?

Yes it does but, of course, I then lose the desirable 5s gap between non-consecutive tracks in the play list.

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Matt

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Re: Q. When does gapless playback have gaps?
« Reply #6 on: January 03, 2013, 10:31:06 am »

Switch tracks: standard gapped (5s)
Gapless for sequential album tracks enabled.

Yes it does but, of course, I then lose the desirable 5s gap between non-consecutive tracks in the play list.

That's an unconventional setup, so maybe there's some combination of settings causing trouble.

Does it make a difference if you manually force prebuffering (Options > Audio > Prebuffering) to 20 seconds?
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Matt Ashland, JRiver Media Center

InflatableMouse

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Re: Q. When does gapless playback have gaps?
« Reply #7 on: January 03, 2013, 10:51:13 am »

Don't mean to hijack the thread, but that doesn't sound right to me. If you set a delay, whether thats .1s or 5s, another option shouldn't negate that (ie, suppress silence).

I probably don't understand how it works, but I always asumed suppress silence was meant to suppress silence from playback (a song ending with 10s silence which is then skipped), not a 5s silence induced by the player itself (ie, the gap).
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pluto

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Re: Q. When does gapless playback have gaps?
« Reply #8 on: January 03, 2013, 10:52:44 am »

Does it make a difference if you manually force prebuffering (Options > Audio > Prebuffering) to 20 seconds?

No.
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pluto

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Re: Q. When does gapless playback have gaps?
« Reply #9 on: January 03, 2013, 10:55:03 am »

...suppress silence...

This has nothing whatsoever to do with 'do not play silence'.
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InflatableMouse

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Re: Q. When does gapless playback have gaps?
« Reply #10 on: January 03, 2013, 10:57:05 am »

This has nothing whatsoever to do with 'do not play silence'.

Oops, sorry. My bad.

Quick to post, slow to think. Ignore me :).
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pluto

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Re: Q. When does gapless playback have gaps?
« Reply #11 on: January 06, 2013, 05:55:05 am »

Matt - have you managed to reproduce this oddity yet?

I have now done so, identically, on three systems of differing configuration.

Dare I say that a fix would be nice  :'(
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pluto

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Re: Q. When does gapless playback have gaps?
« Reply #12 on: January 08, 2013, 11:44:06 am »

A bump to enquire if any thought has been given to this issue. Thanks.
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Matt

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Re: Q. When does gapless playback have gaps?
« Reply #13 on: January 08, 2013, 11:46:20 am »

Could you provide a couple sample files to help me reproduce?  I'm matt at jriver dot com.

Thanks.
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Matt Ashland, JRiver Media Center

pluto

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Re: Q. When does gapless playback have gaps?
« Reply #14 on: January 08, 2013, 12:17:55 pm »

Could you provide a couple sample files to help me reproduce?

I shall try to provide an example by using loopback. Would you be happy with a low bandwidth MP3 demonstration of the issue?

But it is easily reproduced, by me at any rate, on three different installations.

Do the following:

  • Audio/Track change/Standard (gapped) 1 sec
  • Gapless for sequential tracks
  • Set DSP to resample, for example, 44.1kHz to 48kHz

Play some 44.1kHz tracks with sequential track numbering - it's important that there be a good segue between them but in this configuration, you will hear a small glitch between the tracks. The problem goes away if resampling is turned off or you select all track changes to be gapless.
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Matt

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Re: Q. When does gapless playback have gaps?
« Reply #15 on: January 08, 2013, 12:28:47 pm »

Thanks for the details.  I can reproduce it now.

I'll follow-up once I understand what's happening and have it fixed.
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Matt Ashland, JRiver Media Center

Matt

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Re: Q. When does gapless playback have gaps?
« Reply #16 on: January 08, 2013, 01:04:33 pm »

Next build:
Fixed: With resampling enabled, the setting to play sequential album tracks gapless would not work properly if the between track mode was gapped.
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Matt Ashland, JRiver Media Center

pluto

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Re: Q. When does gapless playback have gaps?
« Reply #17 on: January 09, 2013, 06:02:07 pm »


Muchas gracias
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