FS#11539 - some m4a files won't play

Attached to Project: Rockbox
Opened by Harry Hirsch (capreolus) - Saturday, 14 August 2010, 17:27 GMT
Last edited by Andree Buschmann (Buschel) - Monday, 30 August 2010, 21:37 GMT
Task Type Bugs
Category Codecs
Status Closed
Assigned To Andree Buschmann (Buschel)
Operating System Another
Severity Low
Priority Normal
Reported Version Release 3.6
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No


Some m4a files show up in files list, but they don't start to play. example file attached. Sansa Clip+; r27817
This task depends upon

Closed by  Andree Buschmann (Buschel)
Monday, 30 August 2010, 21:37 GMT
Reason for closing:  Fixed
Comment by Harry Hirsch (capreolus) - Saturday, 14 August 2010, 19:55 GMT
Now that I moved this file to another folder, where it follows a wma file, I can get it to play, but it sounds very distorted. Third and last file in that folder is the one from  FS#11540 . I cannot start Kapsberger directly in this folder, nor can I switch from the third file to it. Only way to get it to play is to switch from the first (wma) to it. The wma file is too large to upload.
Comment by Rafaël Carré (funman) - Friday, 20 August 2010, 23:10 GMT
same issue than  FS#11540  ?

You should talk to Buschel on IRC
Comment by Andree Buschmann (Buschel) - Monday, 23 August 2010, 23:44 GMT
Just played around a bit with this file. It cannot be played directly, but only directly after a non-aac-file was played.... Not sure how this can be explained...

The distortion itself is very audible and is also occuring with very early rockbox implementations of libfaad (e.g. r27224 shows this error as well). For now I can state that this effect was not introduced with the latest optimizations (though the distortions sound different with newer revisions).
Comment by Andree Buschmann (Buschel) - Sunday, 29 August 2010, 18:01 GMT
The distortions were introduced with r23967. r23966 plays back flawlessly. I will further investigate...
Comment by Andree Buschmann (Buschel) - Monday, 30 August 2010, 21:36 GMT
Just a remark. This file is not playable realtime on most targets as it is an aac-he file.