0012431: M4V: If incoorrect extension is set to m4a than file is not played correctly

ID	Project	Category	View Status	Date Submitted	Last Update

0012431	MMW v4	Codec	public	2014-12-12 03:11	2016-05-24 17:56

Reporter	peke	Assigned To
Priority	normal	Severity	major	Reproducibility	always
Status	assigned	Resolution	open
Product Version	4.1.6
Target Version	4.1.6

Summary	0012431: M4V: If incoorrect extension is set to m4a than file is not played correctly
Description	In case that M4V file have extension of M4a it is not played correctly and seek is not possible. Sample file can be downloaded from example Forum topic link.
Additional Information	http://www.mediamonkey.com/forum/viewtopic.php?f=6&t=78630
Tags	todoc-KB

Fixed in build

peke 2014-12-12 08:13 developer ~0041429 Last edited: 2014-12-12 08:20	Retested and seeking is not possible even file play correctly when played from start and renamed to m4v

peke 2014-12-12 08:40 developer ~0041431 Last edited: 2014-12-12 08:40	Michal confirmed that Firefox and WMP do not play/seek example, but VLC and AIMP (based on Bass engine) plays it without problems.

michal 2014-12-12 09:26 developer ~0041432	The problem is in WM layer - Windows AAC codec cannot seek properly in this file for some unknown reason (this is why WMP also cannot seek). We probably cannot detect this problem in advance. The solution is to use other decoder - QuickTime (so QT has to be installed) or f_aac_codec. To force MM4 use other decoder, user has to remove/rename in_mfaudio.dll plugin too, so it is not used for decoding. Peke, please write KB about this.