[mythtv] nuvexport incorrectly setting aspect ratio for dvb-t recordings

James Fidell james at fidell.co.uk
Fri Aug 3 09:50:44 UTC 2007

nuvexport appears to be using the following command to get the aspect
ratio for transcoding my dvb-t recordings:

  mplayer -v -v -v -v -nolirc -nojoystick -vo null -ao null -frames 0
-identify <filename>

With both the mplayer-1.0-60_r23482.el5 package from ATrpms and the
mplayer-1.0-0.80.20070715svn.lvn7 package from the livna repository
I end up with the default aspect ratio (4:3) because these always
report an aspect ratio of 0, eg:

  $ mplayer -v -v -v -v -nolirc -nojoystick -vo null -ao null -frames 0
-identify 3071_20070803075200.mpg | fgrep ID_VIDEO_ASPECT

This behaviour seems quite consistent across all 50-odd recordings I
currently have.

Changing the number of frames in the command line to 1 yields a
different result:

  $ mplayer -v -v -v -v -nolirc -nojoystick -vo null -ao null -frames 1
-identify 3071_20070803075200.mpg | fgrep ID_VIDEO_ASPECT

and nuvexport now correctly identifies such recordings as having a 16:9
aspect ratio.

I don't know if this is a valid fix, or applies only to dvb or dvb-t
recordings though.


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