• Status Closed
  • Percent Complete
  • Task Type Bugs
  • Category Codecs
  • Assigned To No-one
  • Operating System All players
  • Severity Low
  • Priority Very Low
  • Reported Version
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by bk - 2006-03-26

FS#4924 - 32000 Hz AAC track plays too fast

When playing a 66 kbps VBR AAC-LC file with 32000 Hz sample rate in rockbox the file plays too fast (sounds “sped up” with chipmunk voices). The same file plays normally on my PC. I can provide the file upon request.

This is with recent (ca. 060315) CVS on an H120.

Closed by  linusnielsen
2006-11-24 06:44
Reason for closing:  Fixed

Well, AAC isn't really a "supported" codec. It barely works at the moment. I asked some questions, and I'm being told that it's the metadata parser handling things improperly.

Also, can you provide a sample file that has this problem, it would be extremely helpful in working out a resolution.

bk commented on 2006-03-29 13:11

I understand that it isn't really supported. I was experimenting to see if at a low enough bitrate it would work realtime. If it played back at normal speed I think this file might come pretty close.

The sample file is attached.

   test.m4a (1.81 MiB)
bk commented on 2006-03-29 16:07

BTW, saw your comments on IRC. The encoder is iTunes 4.7.1 .

spazz commented on 2006-11-15 20:32

Anybody have a idea where the resolutin of this bug is going along?

I've changed how Rockbox reads the frequency of the file, so the problem should be solved now. Could someone experiencing the problem please test and add a comment about the result?

bk commented on 2006-11-23 21:46

The 32000hz test file posted here works normally now. Thanks!

spazz commented on 2006-11-23 22:45

I also tested my 48kHz aac and they work perfectly now. Thanks alot Magnus :)

The bug should be fixed by this commit now:
23 Nov 19:46
Magnus Holmgren
apps/metadata.c 1.59
Read frequency in MP4/AAC files from a different place, if available. Should fix the problem with wrong playback speed for non-44.1kHz files.

Confirmed in the forum:


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