wavpack, very minimal wps

[gaillard]

Hi guys,

quick question.  I have a very minimal wps, just status bar, progress bar and 3 tags, and all options off except crossfeed (which is all i want) and i am using wavpack.

everysong i get a pause, skip or stall in the music for abour 1 or 2 seconds.

ps. i also have, forgot whos it is, custom firmware that stops cpu scaling.

any ideas??

i thought wavpack was one of the better decoders

[Davide-NYC]

Please use a recent build of Rockbox. CVS build is best.
Also: What target do you own? Ipod? Iriver?

[Llorean]

Also, are they lossless or lossy wavpack?

[gaillard]

this was a recent build as of yesterday, only thing modified was that cpu scaling was turned off.  It did it with the scaling on though too, and the most recent build from cvs.  I have a color ipod.

oh and they are lossless.
hmm

[Llorean]

Now you say "a pause skip or stall." Do you mean a single gap at some point, or do you mean that every few seconds playback has a small stall, or what? Please, describe clearly what is happening, because depending on which of those is happening, and perhaps even how often it's skipping, there could still be a few different causes.

[gaillard]

well the audio cuts out completely and then resumes about 2 seconds later as if it couldn't keep up with decoding, although thats not the case right?

[gaillard]

ok looking at the audio thread screen while a wavpack song is playing the pcm bar stays at 16000 or so and just goes up and down up and down.  but the codec just steadily drops.  when it hits zero the pcm instantly goes to zero and then back up to where it was and the codec goes back to where it started and counts down again.  everytime the codec hits 0 i get the cutout like i am talking about.


hope this helps.

[Llorean]

Try settings your anti-skip buffer to a little bit higher than it defaults to (just 10 seconds more should be enough). In your case, this is actually the proper solution.

It has to do with a bug for calculating how large the anti-skip should be based upon seconds.

[gaillard]

i put it on 1 min and it still does it.  it made it through the first song of a cd and on the second it is doing often now, every 8 seconds or so the codec line plumets and then i get the pause and it bumps back up.

[Llorean]

Do you have disk power off enabled or disabled? Also, how large does it say your compressed buffer is? It should never go from full to empty in 8 seconds time, since uncompressed audio can fit more than that in the buffer.

[gaillard]

i don't see the option for disk power off but im sure its on its default.  The compressed buffer (i assume the one your talking about being under audio thread and then codec) is never full, it only gets about 1/8 or 1/10 full.  out if 200,000,000 it starts at like 2,000,000 and then counts down.  Now if i go to this audio thread menu when it is paused it fills up right away (well if i touch the scroll wheel), and then last that long if i start it playing again.

[Llorean]

That is very strange. Is this with an entirely unmodified build, or is this with the patched build? Can you verify this behaviour in an official build downloaded from Rockbox.org?

[gaillard]

yes this is a stock build dated 10-2 all default options except the like simple 3 line wps i loaded and turned on crossfeed. oh and changing the skip buffer.

this was happening with builds of previous dates as well.

[Llorean]

Can you try other file formats and see if the compressed buffer fills all the way, or still only to 2mb?

[gaillard]

no problem give me a few

ok just tried a flac file and it filled almost all the way up, about 25 of 29 megs.  the pcm did go all the way up where as before it wasn't even close

so i guess its a wavpack specific problem...

also with flac it will go down to like 15 megs and then recharge back to like 25.

wavpack it just keeeeeps going down and thats from like 2 megs.

just noticed too with flac boost is on 20 percent whereas its always constant 100 with wavpack.