- Status Unconfirmed
- Percent Complete
- Task Type Bugs
- Category Music playback
- Assigned To No-one
- Operating System Sansa AMSv2
- Severity Low
- Priority Very Low
- Reported Version Release 3.12
- Due in Version Undecided
-
Due Date
Undecided
- Votes
- Private
FS#12856 - HE-AAC plays back at wrong speed
Rockbox 3.1.3 on Clip+ (also iriver h140/340. also previous versions of rockbox).
Some HE-AAC files play back at half speed.
Example file info (comment/lyric fields removed as very long):
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%)
30 second sample attached (cut with ffmpeg, full metadata)
Forum report http://forums.rockbox.org/index.php/topic,43012.0.html
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I don't see the attachment so here it is again
I'm having the same problem in every respect except my .m4a file is not HE-AAC. I've attached a 30sec sample here: 'go.m4a' which demonstrates the issue.
Media info is as follows:
General
Complete name : go.m4a
Format : MPEG-4
Format profile : Apple audio with iTunes info
Codec ID : M4A
File size : 93.7 KiB
Duration : 30s 47ms
Overall bit rate mode : Variable
Overall bit rate : 25.6 Kbps
Writing application : Lavf52.64.2
Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 30s 47ms
Bit rate mode : Variable
Bit rate : 24.0 Kbps
Channel count : 2 channels
Original Channel count : 1 channel
Channel positions : Front: C
Sampling rate : 22.05 KHz
Compression mode : Lossy
Stream size : 88.0 KiB (94%)
The attachments on this bug report are getting mangled by the web server and are un-playable.
Running my file through mp4box fixes this issue e.g. MP4Box -add go.m4a go2.m4a