Support and General Use > Audio Playback, Database and Playlists
HE-AAC plays back at wrong speed
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Julian67:
Running Rockbox 3.1.3 on Clip+
Some HE-AAC files play back at half speed.
Example file info:
--- Code: ---General
Complete name : Witness_-_The_Khmer_Rouge_take_power.m4a
Format : MPEG-4
Format profile : Apple audio with iTunes info
Codec ID : M4A
File size : 4.09 MiB
Duration : 9mn 0s
Overall bit rate mode : Constant
Overall bit rate : 63.5 Kbps
Album : Witness
Album/Performer : BBC Radio
Track name : The Khmer Rouge take power
Grouping : News
Performer : BBC World Service
Composer : BBC iPlayer
Genre : News
Recorded date : 2013-04-18T08:50:00+01:00
Tagged date : UTC 2013-04-18 09:07:25
Writing application : Lavf55.0.100
Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : HE-AAC / LC
Codec ID : 40
Duration : 9mn 0s
Duration_LastFrame : -1ms
Bit rate mode : Constant
Bit rate : 62.7 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz / 24.0 KHz
Compression mode : Lossy
Stream size : 4.04 MiB (99%)
--- End code ---
The same file plays normally on PC players such as MPlayer, and on device such as Nokia feature phone.
I used ffmpeg to cut a 30 second sample (240kB) and uploaded it to: http://www.mediafire.com/?7ej0ekac0gcv57g
saratoga:
Confirmed. Can you post a bug report on the bug tracker (left side of your screen) with the information posted here?
Presumably there is some problem detecting the SBR bits that reconstruct the higher sampling rate.
Julian67:
http://www.rockbox.org/tracker/task/12856
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