[MEncoder-users] MEncoder mangles video after aspect ratio change

[Nico Sabbi]

Zed wrote:

>Hi everybody!
>
>I have a problem with encoding free to air DVB-T TS files to other formats.
>I've tried x264 and Xvid so far. The problem is that as soon as the aspect 
>ratio of the source video changes from 4:3 (commersials) to 16:9 (TV 
>content)  MEncoder mangles the video. The resulting mangled video consists
>of slightly upward sloaping bands of different textures, I suppose as a 
>result of the wrong offset to the video data due to trying to encode at
>the wrong aspect ratio. Burned in subtitles show up as black and white 
>treadmarks over the bottom half of the picture.
>
>I've tried the MEncoder264 frontend on WinXP as well as direct encoding 
>with mencoder using WinXP and Linux.
>
>I've tried the tips in 13.10. Preserving aspect ratio at
>http://www.mplayerhq.hu/DOCS/HTML/en/aspect.html with the same results
>
>mencoder sample-svcd.mpg -ovc lavc -lavcopts 
>vcodec=mpeg4:mbd=2:trell:autoaspect -vf crop=714:548:0:14 -oac copy 
>-o output.avi
>
>Any solutions or suggestions?
>
>- Zed
>
>  
>

-aspect 16/9 should keep the A/R constant; not the best solution, but
since your 4/3 content is made of ads it's not a big loss