[Lmuse-user] Fixed audio stuttering loud repeated segments upon seek

[Tim E. R. <ter...@ro...>]

Hi. Someone recently asked about this. 

With lots of wave tracks, especially with OGG and FLAC files, 
 when you move the play cursor around there are brief annoying 
 non-muted loud repeated segments.

I did a slight readjustment of audio prefetch and midi thread priorities
 (-5 and -1 instead of +1 and +2).

(Robert: Yes I dropped the midi slightly. I felt the audio should have 
 the utmost priority over the midi thread. Do you still think it 
 should be higher as we discussed long ago?  )

The difference is dramatic. Tested with various Jack settings - 'default'
 priority, or priority 50, or no realtime etc.
MusE now mutes the brief times between seeking, with no stuttering.

--------------------------
Now, a word about those OGG and FLAC files:
I mentioned in the forums that too many of these files can make MusE sluggish,
 because libsndfile of course takes more time to read them.
Fair enough. Expected. Use a fast machine.

However I just discovered that if you place two parts overlapping in time,
 containing THE SAME ogg or flac file, MusE will choke badly. For example:

		Track1:	====OGG file wave part=====
		Track2:			=====OGG file wave part======

I recognize this as an all-too-familiar-to-me problem.
As MusE is playing and attempting to read the same file twice but from
 different locations, the sound file does not like this - it does not like
 being forced to go to different locations, rapidly switching between
 two locations like this.
The reason (I think) is these are COMPRESSED files, and they do not like 
 being forced to new locations rapidly like this.
These files want, and need, to progress forward naturally on their own 
 WITHOUT being forced to jump rapidly between two different locations.

Why is this familiar to me?
Well, remember I spoke of my attempts to add automatic resampling
 to MusE using SRC and RubberBand and so on? 
And how it worked so beautifully.
Until I discovered THIS SAME problem.

The resamplers did not like being forced to new locations like this.
They wanted, and needed, to progress forward on their own without being 
 forced between different locations rapidly.

So... Looks like I may have to bring this issue to the forefront again.
I believe the two problems are the same.

Possibly a side benefit being the resampling work could be forced to
 continue, because I'll be forced to deal with this...

But whew, it was tricky, that's why I never completed it.

Cheers.
Tim.