• Status Closed
  • Percent Complete
  • Task Type Bugs
  • Category Music playback
  • Assigned To No-one
  • Operating System iPod Nano
  • Severity Low
  • Priority Very Low
  • Reported Version Daily build (which?)
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by istudio - 2007-10-14
Last edited by bluebrother - 2007-10-15

FS#7953 - playback jitter?

i am not quite sure whether it is my ipod nano can’t process too much sound settings or something else…

for sometime, i can usually hear “jitter” sound (like the DVD player is reading a dirty disc).

at first i thought it was my track but when i rewind it then it doesnt happen again?

Closed by  bluebrother
2007-10-15 16:24
Reason for closing:  Not a Bug
Additional comments about closing:   Warning: Undefined array key "typography" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 371 Warning: Undefined array key "camelcase" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 407

Performance issue, see the FAQ: iki/bin/view/Main/IpodFAQ#Playback_is_gl itchy_skips

We do not provide any support in the tracker. Use the support channels and check the FAQ first the next time.

nls commented on 2007-10-14 19:48

If you mean that the music stops briefly then yes it is most likely due to too much sound processing, try turning some off. Also you can check how much cpu is used if you go into the system→debug→view audio thread screen and look at the boost %

constantly 100% at 80MHz…. once i turn on the Graphic EQ then it will do that? so → that means i cant use EQ?

nls commented on 2007-10-15 16:17

There are many things that use cpu time, you obviously have your player do too many cpu demanding tasks at once.
One big factor is the encoding format you use for your music and which bitrate it is in, generally higher bitrates are slower and performance varies a lot between codecs.
All dsp effect, like every band of EQ, dithering, crossfeed, replaygain etc. use a bit of cpu.
Another big cpu hog is the peakmeter that is displayed on some wpses.

So do this: use a theme without peakmeter, disable as much dsp as you can, remember that every _band_ of eq counts so try using fewer bands etc. If you really need all that dsp, consider switching to a codec with a faster implementation in rockbox.

Also this is a support issue and not a bug and so it does not belong in the tracker, I will close this task tomorrow.


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