Playback problem with .m4v files (1 Viewer)


MP Donator
  • Premium Supporter
  • May 21, 2008
    Bolton, Lancashire, England
    England England
    Hi Guys,

    I have recently been converting my films and TV series to a .m4v format using Handbrake. This is to enable them to be played on the GF's iTouch.

    I have now come up against a codec problem, in that the converted files will not play in MP (although they do play well in VLC). Whenever I try to play them I get a dialog box popping up saying "unable to play... video codec: AVC "

    I currently use SAF 6 unlocked and also the MS-DVD codec that comes with Win7. I have rarely had codec problems, so would be grateful if someone could offer a solution to this one.

    Many thanks in advance.



    Portal Pro
    June 14, 2007
    Sweden Sweden
    I think i only have one m4v file, and it works in MP after i have added the extension.
    In MP and MPC-HC, LAV Filters are being used (Splitter, Audio, Video)
    In GraphStudio, Lav Splitter and Microsoft DTV-DVD Video/Audio Decoder are being used.
    Tested with ATI 5770 and only LAV Filters installed.


    MP Donator
  • Premium Supporter
  • May 21, 2008
    Bolton, Lancashire, England
    England England
    Hi Matpe,

    Thanks for the reply.

    After thinking about this, I have now found out the cause. The first thing I did was add the .m4v extension to the video extensions list in MP and I had no problems playing these file types at all.

    I realised that I had added VLC player so I could easily check the playback of these converted files. This must have added something to the codec list that was preventing MP's codecs playing back the file. I un-installed VLC, and just to be sure, re-installed SAF6 and all was OK again.

    Now I am happy with my settings for video file conversion, I don't need to check the video files in an external player - so have no need for VLC now. I suspect the problem will not occur again.


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