[mythtv-users] Mythvideo and wrong aspect ratio

Saul A. Peebsen jaglover at gmail.com
Wed Sep 21 17:23:06 UTC 2011

On Wed, 21 Sep 2011 14:31:39 +0100
Thomas Boehm <mythtv-users at lists.boehmi.net> wrote:

> Hi list,
> I'm having problems with the aspect ratio of recordings in 16:9,
> which I converted with mythnuv2mkv to mkv. In mythnuv2mkv I set the
> default aspect ratio to 16:9 in case it fails to autodetect it.
> When I watch such a recording in mythvideo, it gets streched
> horizontally on my 4:3 monitor. Sometimes it even stretches the video
> vertically and shrinks it horizontally. Mediainfo always reports an
> aspect ratio of 16:9 for those files and VLC plays it correctly. I
> know I can change the aspect ratio manually when watching, but I want
> a solution which always works.
> I don't have the problem with ripped DVDs in MKV (Handbrake) and
> recordings I converted to xvid in an AVI container (mythnuv2mkv). In
> these cases the video shows correctly with black bars at the top and
> bottom.
> Where does mythvideo gets the information about the aspect ratio from?
> It looks like it doesn't get it from the video dimensions. Is there
> some kind of tag inside the file which is read by mythvideo? Maybe
> mythnuv2mkv writes it wrongly into the file.
> If yes, is there a way to correct it? I tried mmg and re-merged the
> audio and video and specifically set the aspect ratio to 16:9, but it
> doesn't change anything.
> Or does the problem lie with MythTV?

This iformation is stored in MKV header, mkvtoolnix toolset lets you
edit it.

Cheers, Saul

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