[MPlayer-users] Audio click when speed changed

Chris Crochet chris at weldtest.com
Mon May 19 03:26:32 CEST 2014

On Sun, May 18, 2014 at 11:50 AM, Reimar Döffinger <Reimar.Doeffinger at gmx.de>
> So instead I added a (not too bad) hack to scaletempo.
> I am fairly confident that the issue should be gone now as long as you
> use -af scaletempo.
> Though I admit I only tested it with the only sample where I managed to
> really notice the issue, and that was a trivial 1kHz sine.
> But that one definitely came out 100% smooth through all speed changes.
> That change is in r37204.

Since I don't think the problem originates in scaletempo, this probably
won't fix the root issue - but it's possible it helps get rid of the
symptom.  Will give it a try as soon as I can get a Windows 32-bit binary.
 Looks like this rev just missed the last build, so I'll have to wait a
bit.  Though if anyone builds it sooner and can provide a link to download,
that would be appreciated.

> Oh, I missed that part. That is some very interesting information.
> I would have expected the issue would be some audio getting lost.
> If it is indeed old audio coming in I might have to look at some other
> places for the issue...
> If I get time...

Whenever you have time, it's no rush.

I'm thinking a test with audio that consists of a 0.1hz sawtooth or such,
due to the long and predictable waveform, would allow easy verification of
whether the audio defects really are from earlier in the stream.  And if
so, it would also reveal exactly how much earlier, which may provide a clue
into where the issue lies.  I may do such a test myself in the next few

Also repeated my last test, but with Ubuntu 12.04 running in Virtualbox,
just out of curiosity.  The clicks occurred there too.

Thank you for your help!

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