FS#12661 - Problems when playing m4a files
Attached to Project:
Rockbox
Opened by Wolfgang Dilg (rasferret) - Thursday, 03 May 2012, 12:32 GMT
Last edited by MichaelGiacomelli (saratoga) - Thursday, 03 May 2012, 18:35 GMT
Opened by Wolfgang Dilg (rasferret) - Thursday, 03 May 2012, 12:32 GMT
Last edited by MichaelGiacomelli (saratoga) - Thursday, 03 May 2012, 18:35 GMT
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DetailsI have prolems playing m4a files on my clip+.
1. all m4a files available at http://metaebene.me/podcasts/ e.g. http://meta.metaebene.me/media/mm/mm086-deutschland-wurde-heruntergeladen.m4a won't work. They playback engine just skips the files. 2. playing files available at http://www.apfelklatsch.de e.g. http://files.apfelklatsch.de/podcasts_m4a/apfelklatsch_ak_032.m4a consume a enormous amount of cpu time when being played higher speed. normally I listen to them at 180%. with the dev build 5f0cb7 at this speed there apear clicks while playback. |
This task depends upon
Closed by MichaelGiacomelli (saratoga)
Thursday, 03 May 2012, 18:35 GMT
Reason for closing: Not a Bug
Additional comments about closing: See comments.
Thursday, 03 May 2012, 18:35 GMT
Reason for closing: Not a Bug
Additional comments about closing: See comments.
For 2), the problem is that AAC-HE files use a lot of CPU power to decode, which is fine normally, but if you run them at 2x speed they also need 2x the CPU power. Factoring in the overhead for the pitch correction and such, you'll probably be limited to about 1.5x speed if you want realtime playback (that is, no skips).
Both of these problems might in principle be fixable with enough clever optimization and memory savings, but they may not be as well. Either way, they're not bugs, just limitations of what the rather limited hardware can do with such an excessively complicated format as AAC-HE.