• Status Closed
  • Percent Complete
  • Task Type Bugs
  • Category Codecs
  • Assigned To No-one
  • Operating System Iriver H100 series
  • Severity Medium
  • Priority Very Low
  • Reported Version
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by Anonymous Submitter - 2006-02-27

FS#4742 - Hybrid Wavpack .WV Skips (interrupts) every 15sec

Hybrid Wavpack .WV made from a 24-bit/96khz file with -b320 -c (yielding a 432kbps WV)
interrupts every 15 sec.
Wavpack -f (fast) mode produced a file that skips less.
Wavpack -hx (maximum compression) mode skipped more.

Closed by  christi-s
2006-03-19 12:24
Reason for closing:  Invalid
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

Hybrid mode playback is unsupported. Please submit a feature request.

Note: in the details, the -f and -hx modes were also both using hybrid mode at -b320.

On iriver h120:
from 24/96 source:
hybrid .wv + .wvc SKIPS. (and plays as 432kbps, even when .wvc is present; see also other wavpack .wvc bug filed)
non-hybrid lossless .wv plays OK, no skips. (2908kbps vbr)

from 16/44 source:
hybrid .wv+.wvc OK (except doesn’t see .wvc if present)
non-hybrid, lossless .wv OK

It would be great to get the hybrid mode non-skipping from 24/96 source, I would guess the iRiver H120 has enough cpu, since the pure .wv file from 24/96 plays ok.

Lossless .wv uses a *lot* less processing power to decompress than lossy, which is why the lossless one doesn’t skip even though it’s a significantly higher bitrate.

It seems unlikely that a lossy 24/96 at 432kbps will decompress easily at full speed. There’s a fairly large difference in how lossless and lossy files work, and lossless once, even though they’re much higher bitrate, *tend* to require much less effort to decompress.

As for the hybrid, if my understanding of comments made by someone (I think it was Mr. Bryant) realtime playback in hybrid mode requires too much to be feasible. I could be misremembering the statement I read though. It may just be “difficult.”


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