[MEncoder-users] Aspect distortion converting dvb-t files

[Justin Randall]

If you're using scale and the image is 4:3 then it should not be
distorted once it's encoded. You might have to pad the video with
extra pixels to get it to be a proper 4:3 ratio. I assume  from your
capture size that your video is SVCD (PAL/SECAM) (480 x 576).  480×576
is equivalent to 720×576 (at pixel aspect ratio 54/59), so try scaling
to that and see what happens. Anything else and you will be losing
resolution.

On 1/8/07, José Gabriel Moya Yangüela <josemoya at gmail.com> wrote:
> Hello!
>
> I've got a problem converting pvr files.
> When I play the original pvr recorded file, they are (gracefully) displayed
> as a 4:3 movie, despite of video size:
>
> * Windows media player says video size is 480 x 576, aspect ratio is 4:3
> (according to video size, it is 18:15)
> * WinAmp says video size is 480x576, and says nothing about aspect ratio.
> * Mediaplayer classic says it is MPEG2 Video 480x576 (4:3)
> * mplayer says it is MPEG2 480x576  (aspect 2), but it gracefully renders it
> with correct aspect 4:3 (despite of mplayer -identify showing
> ID_VIDEO_ASPECT=0.00)
>
> But, when I convert it, it has some chances to be rendered as 15:18
> (portrait aspect, about 480x576) instead of 18:15 (576x480).
>
> If I use -force-avi-aspect, I see the desired 4:3 image in mplayer, but all
> other media players show a 15:18 (portrait) video.
>
> I've tried aplying the "scale" filter, but it distorts the image.
>
> Sometimes aspect is corrected using 'mencoder pvr://file...' instead of
> 'mencoder file...', but sometimes it does not work.
>
> I'm sure this strange 480:576 (15:18) aspect ratio has something to do with
> dvb standards, because of all players showing correct aspect ratio when file
> is of type mpegpes, but failing when it is converted.
>
> Some hint?
>
> Yours,
> josemoya
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-- 
Justin Randall
617.733.4107